Issue summary: A CMP client that requests certificate revocation on the basis of a PKCS#10 CSR may dereference a NULL pointer and terminate abnormally when processing a crafted revocation response. Impact summary: The NULL pointer dereference happens on a read which leads to a crash and a Denial of Service for the affected client application. CWE: CWE-476: NULL-pointer dereference Description: A CMP client revoking a certificate has to tell the server which certificate to revoke, and may do so by supplying a PKCS#10 CSR instead of the certificate itself or its issuer name and serial number. This is 'openssl cmp -cmd rr -csr <file>' on the command line, or OSSL_CMP_exec_RR_ses() with the certificate supplied via OSSL_CMP_CTX_set1_p10CSR() through the API. A CSR does not contain the issuer name and serial number of the certificate, so the client does not send them. A server may optionally name the certificate it revoked in its response, and the client then compares that name against what it sent. Having sent neither an issuer name nor a serial number, it has nothing to compare against, and a server returning a specially crafted name causes the client to read from a NULL pointer and crash. The revocation response is checked for valid message protection before the affected code is reached, so an attacker must be a malicious or compromised CMP server, or a man-in-the-middle in possession of the secret used for message protection. Clients that identify the certificate to be revoked by a certificate or by issuer and serial number rather than by a PKCS#10 CSR are not affected. FIPS impact: no No FIPS modules are affected by this issue, as the CMP protocol implementation is outside the OpenSSL FIPS module boundary.

zetlyn/cve-nvd vulnerability cve CVE-2026-75805 known 2026-09-29

https://nvd.nist.gov/vuln/detail/CVE-2026-75805

Properties

automatable

yes

An attacker can reliably run all of the kill chain's first four steps without a person.

receipt

Source: NVD
Its words: yes
Read by: field:cve.metrics.ssvcV203[].ssvcData.options[].automatable
Said since: 2026-10-06 12:31 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 12:31 UTC	yes
2026-09-29 17:49 UTC	—

What the source handed over

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      {
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                "status": "affected",
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                "versionType": "semver"
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      }
    ],
    "sourceIdentifier": "openssl-security@openssl.org",
    "vulnStatus": "Undergoing Analysis",
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        "type": "Secondary"
      }
    ]
  }
}

cvss

5.3

receipt

Source: NVD
Its words: 5.3
Read by: field:cve.metrics.cvssMetricV31[type=Primary].cvssData.baseScore || field:cve.metrics.cvssMetricV31[].cvssData.baseScore
Said since: 2026-09-29 17:49 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

What the source handed over

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            "vendor": "OpenSSL",
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                "status": "affected",
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                "versionType": "semver"
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}

cvss_vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

receipt

Source: NVD
Its words: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Read by: field:cve.metrics.cvssMetricV31[type=Primary].cvssData.vectorString || field:cve.metrics.cvssMetricV31[].cvssData.vectorString
Said since: 2026-10-06 12:31 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 12:31 UTC	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
2026-09-29 17:49 UTC	—

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "defaultStatus": "unaffected",
            "product": "OpenSSL",
            "vendor": "OpenSSL",
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                "versionType": "semver"
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      }
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    "references": [
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        "type": "Secondary"
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    ]
  }
}

cwe

CWE-476

receipt

Source: NVD
Its words: CWE-476
Read by: field:cve.weaknesses[].description[].value
Said since: 2026-10-06 12:31 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 12:31 UTC	CWE-476
2026-09-29 17:49 UTC	—

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "defaultStatus": "unaffected",
            "product": "OpenSSL",
            "vendor": "OpenSSL",
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                "status": "affected",
                "version": "4.0.0",
                "versionType": "semver"
              },
              {
                "lessThan": "3.6.5",
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                "versionType": "semver"
              },
              {
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                "status": "affected",
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                "versionType": "semver"
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          }
        ],
        "source": "openssl-security@openssl.org"
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      }
    ],
    "id": "CVE-2026-75805",
    "lastModified": "2026-09-29T21:27:41.130",
    "metrics": {
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            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
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          "ssvcData": {
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            "version": "2.0.3"
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      ]
    },
    "published": "2026-09-29T16:17:11.063",
    "references": [
      {
        "source": "openssl-security@openssl.org",
        "url": "https://github.com/openssl/openssl/commit/7588db7fef14209c3caa3a101d11a02006b19166"
      },
      {
        "source": "openssl-security@openssl.org",
        "url": "https://github.com/openssl/openssl/commit/7ca0ccb5172a577e9b87267d77bfe21e5481a5e7"
      },
      {
        "source": "openssl-security@openssl.org",
        "url": "https://github.com/openssl/openssl/commit/9eb2a8a9b86136cdb39d6d7d50644dd66941cdc3"
      },
      {
        "source": "openssl-security@openssl.org",
        "url": "https://github.com/openssl/openssl/commit/abf02872a4b71767ecc72293424420f5b009190f"
      },
      {
        "source": "openssl-security@openssl.org",
        "url": "https://openssl-library.org/news/secadv/20260929.txt"
      }
    ],
    "sourceIdentifier": "openssl-security@openssl.org",
    "vulnStatus": "Undergoing Analysis",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-476"
          }
        ],
        "source": "openssl-security@openssl.org",
        "type": "Secondary"
      }
    ]
  }
}

exploitation

none

No evidence of exploitation, and no public proof of concept.

receipt

Source: NVD
Its words: none
Read by: field:cve.metrics.ssvcV203[].ssvcData.options[].exploitation
Said since: 2026-10-06 12:31 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 12:31 UTC	none
2026-09-29 17:49 UTC	—

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "defaultStatus": "unaffected",
            "product": "OpenSSL",
            "vendor": "OpenSSL",
            "versions": [
              {
                "lessThan": "4.0.3",
                "status": "affected",
                "version": "4.0.0",
                "versionType": "semver"
              },
              {
                "lessThan": "3.6.5",
                "status": "affected",
                "version": "3.6.0",
                "versionType": "semver"
              },
              {
                "lessThan": "3.5.9",
                "status": "affected",
                "version": "3.5.0",
                "versionType": "semver"
              },
              {
                "lessThan": "3.4.8",
                "status": "affected",
                "version": "3.4.0",
                "versionType": "semver"
              },
              {
                "lessThan": "3.0.23",
                "status": "affected",
                "version": "3.0.0",
                "versionType": "semver"
              }
            ]
          }
        ],
        "source": "openssl-security@openssl.org"
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "Issue summary: A CMP client that requests certificate revocation on the basis\nof a PKCS#10 CSR may dereference a NULL pointer and terminate abnormally when\nprocessing a crafted revocation response. \n\nImpact summary: The NULL pointer dereference happens on a read which \nleads to a crash and a Denial of Service for the affected client application.\n\nCWE: CWE-476: NULL-pointer dereference\n\nDescription: A CMP client revoking a certificate has to tell the server which\ncertificate to revoke, and may do so by supplying a PKCS#10 CSR instead of the\ncertificate itself or its issuer name and serial number. This is\n'openssl cmp -cmd rr -csr <file>' on the command line, or\nOSSL_CMP_exec_RR_ses() with the certificate supplied via\nOSSL_CMP_CTX_set1_p10CSR() through the API.\n\nA CSR does not contain the issuer name and serial number of the certificate,\nso the client does not send them. A server may optionally name the\ncertificate it revoked in its response, and the client then compares that\nname against what it sent. Having sent neither an issuer name nor a serial\nnumber, it has nothing to compare against, and a server returning a specially\ncrafted name causes the client to read from a NULL pointer and crash.\n\nThe revocation response is checked for valid message protection before\nthe affected code is reached, so an attacker must be a malicious or\ncompromised CMP server, or a man-in-the-middle in possession of the\nsecret used for message protection. Clients that identify the certificate\nto be revoked by a certificate or by issuer and serial number rather\nthan by a PKCS#10 CSR are not affected.\n\nFIPS impact: no\nNo FIPS modules are affected by this issue, as the CMP protocol\nimplementation is outside the OpenSSL FIPS module boundary."
      }
    ],
    "id": "CVE-2026-75805",
    "lastModified": "2026-09-29T21:27:41.130",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
            "version": "3.1"
          },
          "exploitabilityScore": 3.9,
          "impactScore": 1.4,
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2026-75805",
            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "yes"
              },
              {
                "technicalImpact": "partial"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-09-29T16:54:03.315064Z",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-09-29T16:17:11.063",
    "references": [
      {
        "source": "openssl-security@openssl.org",
        "url": "https://github.com/openssl/openssl/commit/7588db7fef14209c3caa3a101d11a02006b19166"
      },
      {
        "source": "openssl-security@openssl.org",
        "url": "https://github.com/openssl/openssl/commit/7ca0ccb5172a577e9b87267d77bfe21e5481a5e7"
      },
      {
        "source": "openssl-security@openssl.org",
        "url": "https://github.com/openssl/openssl/commit/9eb2a8a9b86136cdb39d6d7d50644dd66941cdc3"
      },
      {
        "source": "openssl-security@openssl.org",
        "url": "https://github.com/openssl/openssl/commit/abf02872a4b71767ecc72293424420f5b009190f"
      },
      {
        "source": "openssl-security@openssl.org",
        "url": "https://openssl-library.org/news/secadv/20260929.txt"
      }
    ],
    "sourceIdentifier": "openssl-security@openssl.org",
    "vulnStatus": "Undergoing Analysis",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-476"
          }
        ],
        "source": "openssl-security@openssl.org",
        "type": "Secondary"
      }
    ]
  }
}

fixed_in

4.0.3, 3.6.5, 3.5.9, 3.4.8, 3.0.23

receipt

Source: NVD
Its words: 4.0.3, 3.6.5, 3.5.9, 3.4.8, 3.0.23
Read by: field:cve.affected[].affectedData[].versions[status=affected].lessThan
Said since: 2026-10-06 12:31 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 12:31 UTC	4.0.3, 3.6.5, 3.5.9, 3.4.8, 3.0.23
2026-09-29 17:49 UTC	—

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "defaultStatus": "unaffected",
            "product": "OpenSSL",
            "vendor": "OpenSSL",
            "versions": [
              {
                "lessThan": "4.0.3",
                "status": "affected",
                "version": "4.0.0",
                "versionType": "semver"
              },
              {
                "lessThan": "3.6.5",
                "status": "affected",
                "version": "3.6.0",
                "versionType": "semver"
              },
              {
                "lessThan": "3.5.9",
                "status": "affected",
                "version": "3.5.0",
                "versionType": "semver"
              },
              {
                "lessThan": "3.4.8",
                "status": "affected",
                "version": "3.4.0",
                "versionType": "semver"
              },
              {
                "lessThan": "3.0.23",
                "status": "affected",
                "version": "3.0.0",
                "versionType": "semver"
              }
            ]
          }
        ],
        "source": "openssl-security@openssl.org"
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "Issue summary: A CMP client that requests certificate revocation on the basis\nof a PKCS#10 CSR may dereference a NULL pointer and terminate abnormally when\nprocessing a crafted revocation response. \n\nImpact summary: The NULL pointer dereference happens on a read which \nleads to a crash and a Denial of Service for the affected client application.\n\nCWE: CWE-476: NULL-pointer dereference\n\nDescription: A CMP client revoking a certificate has to tell the server which\ncertificate to revoke, and may do so by supplying a PKCS#10 CSR instead of the\ncertificate itself or its issuer name and serial number. This is\n'openssl cmp -cmd rr -csr <file>' on the command line, or\nOSSL_CMP_exec_RR_ses() with the certificate supplied via\nOSSL_CMP_CTX_set1_p10CSR() through the API.\n\nA CSR does not contain the issuer name and serial number of the certificate,\nso the client does not send them. A server may optionally name the\ncertificate it revoked in its response, and the client then compares that\nname against what it sent. Having sent neither an issuer name nor a serial\nnumber, it has nothing to compare against, and a server returning a specially\ncrafted name causes the client to read from a NULL pointer and crash.\n\nThe revocation response is checked for valid message protection before\nthe affected code is reached, so an attacker must be a malicious or\ncompromised CMP server, or a man-in-the-middle in possession of the\nsecret used for message protection. Clients that identify the certificate\nto be revoked by a certificate or by issuer and serial number rather\nthan by a PKCS#10 CSR are not affected.\n\nFIPS impact: no\nNo FIPS modules are affected by this issue, as the CMP protocol\nimplementation is outside the OpenSSL FIPS module boundary."
      }
    ],
    "id": "CVE-2026-75805",
    "lastModified": "2026-09-29T21:27:41.130",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
            "version": "3.1"
          },
          "exploitabilityScore": 3.9,
          "impactScore": 1.4,
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2026-75805",
            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "yes"
              },
              {
                "technicalImpact": "partial"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-09-29T16:54:03.315064Z",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-09-29T16:17:11.063",
    "references": [
      {
        "source": "openssl-security@openssl.org",
        "url": "https://github.com/openssl/openssl/commit/7588db7fef14209c3caa3a101d11a02006b19166"
      },
      {
        "source": "openssl-security@openssl.org",
        "url": "https://github.com/openssl/openssl/commit/7ca0ccb5172a577e9b87267d77bfe21e5481a5e7"
      },
      {
        "source": "openssl-security@openssl.org",
        "url": "https://github.com/openssl/openssl/commit/9eb2a8a9b86136cdb39d6d7d50644dd66941cdc3"
      },
      {
        "source": "openssl-security@openssl.org",
        "url": "https://github.com/openssl/openssl/commit/abf02872a4b71767ecc72293424420f5b009190f"
      },
      {
        "source": "openssl-security@openssl.org",
        "url": "https://openssl-library.org/news/secadv/20260929.txt"
      }
    ],
    "sourceIdentifier": "openssl-security@openssl.org",
    "vulnStatus": "Undergoing Analysis",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-476"
          }
        ],
        "source": "openssl-security@openssl.org",
        "type": "Secondary"
      }
    ]
  }
}

product

OpenSSL

receipt

Source: NVD
Its words: OpenSSL
Read by: field:cve.affected[].affectedData[].product
Said since: 2026-09-29 17:49 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "defaultStatus": "unaffected",
            "product": "OpenSSL",
            "vendor": "OpenSSL",
            "versions": [
              {
                "lessThan": "4.0.3",
                "status": "affected",
                "version": "4.0.0",
                "versionType": "semver"
              },
              {
                "lessThan": "3.6.5",
                "status": "affected",
                "version": "3.6.0",
                "versionType": "semver"
              },
              {
                "lessThan": "3.5.9",
                "status": "affected",
                "version": "3.5.0",
                "versionType": "semver"
              },
              {
                "lessThan": "3.4.8",
                "status": "affected",
                "version": "3.4.0",
                "versionType": "semver"
              },
              {
                "lessThan": "3.0.23",
                "status": "affected",
                "version": "3.0.0",
                "versionType": "semver"
              }
            ]
          }
        ],
        "source": "openssl-security@openssl.org"
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "Issue summary: A CMP client that requests certificate revocation on the basis\nof a PKCS#10 CSR may dereference a NULL pointer and terminate abnormally when\nprocessing a crafted revocation response. \n\nImpact summary: The NULL pointer dereference happens on a read which \nleads to a crash and a Denial of Service for the affected client application.\n\nCWE: CWE-476: NULL-pointer dereference\n\nDescription: A CMP client revoking a certificate has to tell the server which\ncertificate to revoke, and may do so by supplying a PKCS#10 CSR instead of the\ncertificate itself or its issuer name and serial number. This is\n'openssl cmp -cmd rr -csr <file>' on the command line, or\nOSSL_CMP_exec_RR_ses() with the certificate supplied via\nOSSL_CMP_CTX_set1_p10CSR() through the API.\n\nA CSR does not contain the issuer name and serial number of the certificate,\nso the client does not send them. A server may optionally name the\ncertificate it revoked in its response, and the client then compares that\nname against what it sent. Having sent neither an issuer name nor a serial\nnumber, it has nothing to compare against, and a server returning a specially\ncrafted name causes the client to read from a NULL pointer and crash.\n\nThe revocation response is checked for valid message protection before\nthe affected code is reached, so an attacker must be a malicious or\ncompromised CMP server, or a man-in-the-middle in possession of the\nsecret used for message protection. Clients that identify the certificate\nto be revoked by a certificate or by issuer and serial number rather\nthan by a PKCS#10 CSR are not affected.\n\nFIPS impact: no\nNo FIPS modules are affected by this issue, as the CMP protocol\nimplementation is outside the OpenSSL FIPS module boundary."
      }
    ],
    "id": "CVE-2026-75805",
    "lastModified": "2026-09-29T21:27:41.130",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
            "version": "3.1"
          },
          "exploitabilityScore": 3.9,
          "impactScore": 1.4,
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2026-75805",
            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "yes"
              },
              {
                "technicalImpact": "partial"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-09-29T16:54:03.315064Z",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-09-29T16:17:11.063",
    "references": [
      {
        "source": "openssl-security@openssl.org",
        "url": "https://github.com/openssl/openssl/commit/7588db7fef14209c3caa3a101d11a02006b19166"
      },
      {
        "source": "openssl-security@openssl.org",
        "url": "https://github.com/openssl/openssl/commit/7ca0ccb5172a577e9b87267d77bfe21e5481a5e7"
      },
      {
        "source": "openssl-security@openssl.org",
        "url": "https://github.com/openssl/openssl/commit/9eb2a8a9b86136cdb39d6d7d50644dd66941cdc3"
      },
      {
        "source": "openssl-security@openssl.org",
        "url": "https://github.com/openssl/openssl/commit/abf02872a4b71767ecc72293424420f5b009190f"
      },
      {
        "source": "openssl-security@openssl.org",
        "url": "https://openssl-library.org/news/secadv/20260929.txt"
      }
    ],
    "sourceIdentifier": "openssl-security@openssl.org",
    "vulnStatus": "Undergoing Analysis",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-476"
          }
        ],
        "source": "openssl-security@openssl.org",
        "type": "Secondary"
      }
    ]
  }
}

severity

MEDIUM

From 4.0 to 6.9.

receipt

Source: NVD
Its words: MEDIUM
Read by: field:cve.metrics.cvssMetricV31[type=Primary].cvssData.baseSeverity || field:cve.metrics.cvssMetricV31[].cvssData.baseSeverity
Said since: 2026-10-06 12:31 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 12:31 UTC	MEDIUM
2026-09-29 17:49 UTC	—

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "defaultStatus": "unaffected",
            "product": "OpenSSL",
            "vendor": "OpenSSL",
            "versions": [
              {
                "lessThan": "4.0.3",
                "status": "affected",
                "version": "4.0.0",
                "versionType": "semver"
              },
              {
                "lessThan": "3.6.5",
                "status": "affected",
                "version": "3.6.0",
                "versionType": "semver"
              },
              {
                "lessThan": "3.5.9",
                "status": "affected",
                "version": "3.5.0",
                "versionType": "semver"
              },
              {
                "lessThan": "3.4.8",
                "status": "affected",
                "version": "3.4.0",
                "versionType": "semver"
              },
              {
                "lessThan": "3.0.23",
                "status": "affected",
                "version": "3.0.0",
                "versionType": "semver"
              }
            ]
          }
        ],
        "source": "openssl-security@openssl.org"
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "Issue summary: A CMP client that requests certificate revocation on the basis\nof a PKCS#10 CSR may dereference a NULL pointer and terminate abnormally when\nprocessing a crafted revocation response. \n\nImpact summary: The NULL pointer dereference happens on a read which \nleads to a crash and a Denial of Service for the affected client application.\n\nCWE: CWE-476: NULL-pointer dereference\n\nDescription: A CMP client revoking a certificate has to tell the server which\ncertificate to revoke, and may do so by supplying a PKCS#10 CSR instead of the\ncertificate itself or its issuer name and serial number. This is\n'openssl cmp -cmd rr -csr <file>' on the command line, or\nOSSL_CMP_exec_RR_ses() with the certificate supplied via\nOSSL_CMP_CTX_set1_p10CSR() through the API.\n\nA CSR does not contain the issuer name and serial number of the certificate,\nso the client does not send them. A server may optionally name the\ncertificate it revoked in its response, and the client then compares that\nname against what it sent. Having sent neither an issuer name nor a serial\nnumber, it has nothing to compare against, and a server returning a specially\ncrafted name causes the client to read from a NULL pointer and crash.\n\nThe revocation response is checked for valid message protection before\nthe affected code is reached, so an attacker must be a malicious or\ncompromised CMP server, or a man-in-the-middle in possession of the\nsecret used for message protection. Clients that identify the certificate\nto be revoked by a certificate or by issuer and serial number rather\nthan by a PKCS#10 CSR are not affected.\n\nFIPS impact: no\nNo FIPS modules are affected by this issue, as the CMP protocol\nimplementation is outside the OpenSSL FIPS module boundary."
      }
    ],
    "id": "CVE-2026-75805",
    "lastModified": "2026-09-29T21:27:41.130",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
            "version": "3.1"
          },
          "exploitabilityScore": 3.9,
          "impactScore": 1.4,
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2026-75805",
            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "yes"
              },
              {
                "technicalImpact": "partial"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-09-29T16:54:03.315064Z",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-09-29T16:17:11.063",
    "references": [
      {
        "source": "openssl-security@openssl.org",
        "url": "https://github.com/openssl/openssl/commit/7588db7fef14209c3caa3a101d11a02006b19166"
      },
      {
        "source": "openssl-security@openssl.org",
        "url": "https://github.com/openssl/openssl/commit/7ca0ccb5172a577e9b87267d77bfe21e5481a5e7"
      },
      {
        "source": "openssl-security@openssl.org",
        "url": "https://github.com/openssl/openssl/commit/9eb2a8a9b86136cdb39d6d7d50644dd66941cdc3"
      },
      {
        "source": "openssl-security@openssl.org",
        "url": "https://github.com/openssl/openssl/commit/abf02872a4b71767ecc72293424420f5b009190f"
      },
      {
        "source": "openssl-security@openssl.org",
        "url": "https://openssl-library.org/news/secadv/20260929.txt"
      }
    ],
    "sourceIdentifier": "openssl-security@openssl.org",
    "vulnStatus": "Undergoing Analysis",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-476"
          }
        ],
        "source": "openssl-security@openssl.org",
        "type": "Secondary"
      }
    ]
  }
}

status

Undergoing Analysis

receipt

Source: NVD
Its words: Undergoing Analysis
Read by: field:cve.vulnStatus
Said since: 2026-10-06 11:32 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 11:32 UTC	Undergoing Analysis
2026-10-02 12:00 UTC	Awaiting Analysis
2026-09-29 17:49 UTC	Received

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "defaultStatus": "unaffected",
            "product": "OpenSSL",
            "vendor": "OpenSSL",
            "versions": [
              {
                "lessThan": "4.0.3",
                "status": "affected",
                "version": "4.0.0",
                "versionType": "semver"
              },
              {
                "lessThan": "3.6.5",
                "status": "affected",
                "version": "3.6.0",
                "versionType": "semver"
              },
              {
                "lessThan": "3.5.9",
                "status": "affected",
                "version": "3.5.0",
                "versionType": "semver"
              },
              {
                "lessThan": "3.4.8",
                "status": "affected",
                "version": "3.4.0",
                "versionType": "semver"
              },
              {
                "lessThan": "3.0.23",
                "status": "affected",
                "version": "3.0.0",
                "versionType": "semver"
              }
            ]
          }
        ],
        "source": "openssl-security@openssl.org"
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "Issue summary: A CMP client that requests certificate revocation on the basis\nof a PKCS#10 CSR may dereference a NULL pointer and terminate abnormally when\nprocessing a crafted revocation response. \n\nImpact summary: The NULL pointer dereference happens on a read which \nleads to a crash and a Denial of Service for the affected client application.\n\nCWE: CWE-476: NULL-pointer dereference\n\nDescription: A CMP client revoking a certificate has to tell the server which\ncertificate to revoke, and may do so by supplying a PKCS#10 CSR instead of the\ncertificate itself or its issuer name and serial number. This is\n'openssl cmp -cmd rr -csr <file>' on the command line, or\nOSSL_CMP_exec_RR_ses() with the certificate supplied via\nOSSL_CMP_CTX_set1_p10CSR() through the API.\n\nA CSR does not contain the issuer name and serial number of the certificate,\nso the client does not send them. A server may optionally name the\ncertificate it revoked in its response, and the client then compares that\nname against what it sent. Having sent neither an issuer name nor a serial\nnumber, it has nothing to compare against, and a server returning a specially\ncrafted name causes the client to read from a NULL pointer and crash.\n\nThe revocation response is checked for valid message protection before\nthe affected code is reached, so an attacker must be a malicious or\ncompromised CMP server, or a man-in-the-middle in possession of the\nsecret used for message protection. Clients that identify the certificate\nto be revoked by a certificate or by issuer and serial number rather\nthan by a PKCS#10 CSR are not affected.\n\nFIPS impact: no\nNo FIPS modules are affected by this issue, as the CMP protocol\nimplementation is outside the OpenSSL FIPS module boundary."
      }
    ],
    "id": "CVE-2026-75805",
    "lastModified": "2026-09-29T21:27:41.130",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
            "version": "3.1"
          },
          "exploitabilityScore": 3.9,
          "impactScore": 1.4,
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2026-75805",
            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "yes"
              },
              {
                "technicalImpact": "partial"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-09-29T16:54:03.315064Z",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-09-29T16:17:11.063",
    "references": [
      {
        "source": "openssl-security@openssl.org",
        "url": "https://github.com/openssl/openssl/commit/7588db7fef14209c3caa3a101d11a02006b19166"
      },
      {
        "source": "openssl-security@openssl.org",
        "url": "https://github.com/openssl/openssl/commit/7ca0ccb5172a577e9b87267d77bfe21e5481a5e7"
      },
      {
        "source": "openssl-security@openssl.org",
        "url": "https://github.com/openssl/openssl/commit/9eb2a8a9b86136cdb39d6d7d50644dd66941cdc3"
      },
      {
        "source": "openssl-security@openssl.org",
        "url": "https://github.com/openssl/openssl/commit/abf02872a4b71767ecc72293424420f5b009190f"
      },
      {
        "source": "openssl-security@openssl.org",
        "url": "https://openssl-library.org/news/secadv/20260929.txt"
      }
    ],
    "sourceIdentifier": "openssl-security@openssl.org",
    "vulnStatus": "Undergoing Analysis",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-476"
          }
        ],
        "source": "openssl-security@openssl.org",
        "type": "Secondary"
      }
    ]
  }
}

technical_impact

partial

The attacker gains limited control, or limited information.

receipt

Source: NVD
Its words: partial
Read by: field:cve.metrics.ssvcV203[].ssvcData.options[].technicalImpact
Said since: 2026-10-06 12:31 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 12:31 UTC	partial
2026-09-29 17:49 UTC	—

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "defaultStatus": "unaffected",
            "product": "OpenSSL",
            "vendor": "OpenSSL",
            "versions": [
              {
                "lessThan": "4.0.3",
                "status": "affected",
                "version": "4.0.0",
                "versionType": "semver"
              },
              {
                "lessThan": "3.6.5",
                "status": "affected",
                "version": "3.6.0",
                "versionType": "semver"
              },
              {
                "lessThan": "3.5.9",
                "status": "affected",
                "version": "3.5.0",
                "versionType": "semver"
              },
              {
                "lessThan": "3.4.8",
                "status": "affected",
                "version": "3.4.0",
                "versionType": "semver"
              },
              {
                "lessThan": "3.0.23",
                "status": "affected",
                "version": "3.0.0",
                "versionType": "semver"
              }
            ]
          }
        ],
        "source": "openssl-security@openssl.org"
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "Issue summary: A CMP client that requests certificate revocation on the basis\nof a PKCS#10 CSR may dereference a NULL pointer and terminate abnormally when\nprocessing a crafted revocation response. \n\nImpact summary: The NULL pointer dereference happens on a read which \nleads to a crash and a Denial of Service for the affected client application.\n\nCWE: CWE-476: NULL-pointer dereference\n\nDescription: A CMP client revoking a certificate has to tell the server which\ncertificate to revoke, and may do so by supplying a PKCS#10 CSR instead of the\ncertificate itself or its issuer name and serial number. This is\n'openssl cmp -cmd rr -csr <file>' on the command line, or\nOSSL_CMP_exec_RR_ses() with the certificate supplied via\nOSSL_CMP_CTX_set1_p10CSR() through the API.\n\nA CSR does not contain the issuer name and serial number of the certificate,\nso the client does not send them. A server may optionally name the\ncertificate it revoked in its response, and the client then compares that\nname against what it sent. Having sent neither an issuer name nor a serial\nnumber, it has nothing to compare against, and a server returning a specially\ncrafted name causes the client to read from a NULL pointer and crash.\n\nThe revocation response is checked for valid message protection before\nthe affected code is reached, so an attacker must be a malicious or\ncompromised CMP server, or a man-in-the-middle in possession of the\nsecret used for message protection. Clients that identify the certificate\nto be revoked by a certificate or by issuer and serial number rather\nthan by a PKCS#10 CSR are not affected.\n\nFIPS impact: no\nNo FIPS modules are affected by this issue, as the CMP protocol\nimplementation is outside the OpenSSL FIPS module boundary."
      }
    ],
    "id": "CVE-2026-75805",
    "lastModified": "2026-09-29T21:27:41.130",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
            "version": "3.1"
          },
          "exploitabilityScore": 3.9,
          "impactScore": 1.4,
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2026-75805",
            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "yes"
              },
              {
                "technicalImpact": "partial"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-09-29T16:54:03.315064Z",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-09-29T16:17:11.063",
    "references": [
      {
        "source": "openssl-security@openssl.org",
        "url": "https://github.com/openssl/openssl/commit/7588db7fef14209c3caa3a101d11a02006b19166"
      },
      {
        "source": "openssl-security@openssl.org",
        "url": "https://github.com/openssl/openssl/commit/7ca0ccb5172a577e9b87267d77bfe21e5481a5e7"
      },
      {
        "source": "openssl-security@openssl.org",
        "url": "https://github.com/openssl/openssl/commit/9eb2a8a9b86136cdb39d6d7d50644dd66941cdc3"
      },
      {
        "source": "openssl-security@openssl.org",
        "url": "https://github.com/openssl/openssl/commit/abf02872a4b71767ecc72293424420f5b009190f"
      },
      {
        "source": "openssl-security@openssl.org",
        "url": "https://openssl-library.org/news/secadv/20260929.txt"
      }
    ],
    "sourceIdentifier": "openssl-security@openssl.org",
    "vulnStatus": "Undergoing Analysis",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-476"
          }
        ],
        "source": "openssl-security@openssl.org",
        "type": "Secondary"
      }
    ]
  }
}

vendor

OpenSSL

receipt

Source: NVD
Its words: OpenSSL
Read by: field:cve.affected[].affectedData[].vendor
Said since: 2026-09-29 17:49 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "defaultStatus": "unaffected",
            "product": "OpenSSL",
            "vendor": "OpenSSL",
            "versions": [
              {
                "lessThan": "4.0.3",
                "status": "affected",
                "version": "4.0.0",
                "versionType": "semver"
              },
              {
                "lessThan": "3.6.5",
                "status": "affected",
                "version": "3.6.0",
                "versionType": "semver"
              },
              {
                "lessThan": "3.5.9",
                "status": "affected",
                "version": "3.5.0",
                "versionType": "semver"
              },
              {
                "lessThan": "3.4.8",
                "status": "affected",
                "version": "3.4.0",
                "versionType": "semver"
              },
              {
                "lessThan": "3.0.23",
                "status": "affected",
                "version": "3.0.0",
                "versionType": "semver"
              }
            ]
          }
        ],
        "source": "openssl-security@openssl.org"
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "Issue summary: A CMP client that requests certificate revocation on the basis\nof a PKCS#10 CSR may dereference a NULL pointer and terminate abnormally when\nprocessing a crafted revocation response. \n\nImpact summary: The NULL pointer dereference happens on a read which \nleads to a crash and a Denial of Service for the affected client application.\n\nCWE: CWE-476: NULL-pointer dereference\n\nDescription: A CMP client revoking a certificate has to tell the server which\ncertificate to revoke, and may do so by supplying a PKCS#10 CSR instead of the\ncertificate itself or its issuer name and serial number. This is\n'openssl cmp -cmd rr -csr <file>' on the command line, or\nOSSL_CMP_exec_RR_ses() with the certificate supplied via\nOSSL_CMP_CTX_set1_p10CSR() through the API.\n\nA CSR does not contain the issuer name and serial number of the certificate,\nso the client does not send them. A server may optionally name the\ncertificate it revoked in its response, and the client then compares that\nname against what it sent. Having sent neither an issuer name nor a serial\nnumber, it has nothing to compare against, and a server returning a specially\ncrafted name causes the client to read from a NULL pointer and crash.\n\nThe revocation response is checked for valid message protection before\nthe affected code is reached, so an attacker must be a malicious or\ncompromised CMP server, or a man-in-the-middle in possession of the\nsecret used for message protection. Clients that identify the certificate\nto be revoked by a certificate or by issuer and serial number rather\nthan by a PKCS#10 CSR are not affected.\n\nFIPS impact: no\nNo FIPS modules are affected by this issue, as the CMP protocol\nimplementation is outside the OpenSSL FIPS module boundary."
      }
    ],
    "id": "CVE-2026-75805",
    "lastModified": "2026-09-29T21:27:41.130",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
            "version": "3.1"
          },
          "exploitabilityScore": 3.9,
          "impactScore": 1.4,
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2026-75805",
            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "yes"
              },
              {
                "technicalImpact": "partial"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-09-29T16:54:03.315064Z",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-09-29T16:17:11.063",
    "references": [
      {
        "source": "openssl-security@openssl.org",
        "url": "https://github.com/openssl/openssl/commit/7588db7fef14209c3caa3a101d11a02006b19166"
      },
      {
        "source": "openssl-security@openssl.org",
        "url": "https://github.com/openssl/openssl/commit/7ca0ccb5172a577e9b87267d77bfe21e5481a5e7"
      },
      {
        "source": "openssl-security@openssl.org",
        "url": "https://github.com/openssl/openssl/commit/9eb2a8a9b86136cdb39d6d7d50644dd66941cdc3"
      },
      {
        "source": "openssl-security@openssl.org",
        "url": "https://github.com/openssl/openssl/commit/abf02872a4b71767ecc72293424420f5b009190f"
      },
      {
        "source": "openssl-security@openssl.org",
        "url": "https://openssl-library.org/news/secadv/20260929.txt"
      }
    ],
    "sourceIdentifier": "openssl-security@openssl.org",
    "vulnStatus": "Undergoing Analysis",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-476"
          }
        ],
        "source": "openssl-security@openssl.org",
        "type": "Secondary"
      }
    ]
  }
}

Text

Issue summary: A CMP client that requests certificate revocation on the basis of a PKCS#10 CSR may dereference a NULL pointer and terminate abnormally when processing a crafted revocation response. Impact summary: The NULL pointer dereference happens on a read which leads to a crash and a Denial of Service for the affected client application. CWE: CWE-476: NULL-pointer dereference Description: A CMP client revoking a certificate has to tell the server which certificate to revoke, and may do so by supplying a PKCS#10 CSR instead of the certificate itself or its issuer name and serial number. This is 'openssl cmp -cmd rr -csr <file>' on the command line, or OSSL_CMP_exec_RR_ses() with the certificate supplied via OSSL_CMP_CTX_set1_p10CSR() through the API. A CSR does not contain the issuer name and serial number of the certificate, so the client does not send them. A server may optionally name the certificate it revoked in its response, and the client then compares that name against what it sent. Having sent neither an issuer name nor a serial number, it has nothing to compare against, and a server returning a specially crafted name causes the client to read from a NULL pointer and crash. The revocation response is checked for valid message protection before the affected code is reached, so an attacker must be a malicious or compromised CMP server, or a man-in-the-middle in possession of the secret used for message protection. Clients that identify the certificate to be revoked by a certificate or by issuer and serial number rather than by a PKCS#10 CSR are not affected. FIPS impact: no No FIPS modules are affected by this issue, as the CMP protocol implementation is outside the OpenSSL FIPS module boundary.