openssl: openssl: Denial of Service via crafted CMP certificate revocation response

cve CVE-2026-75805 3 sources, 3 claims · Watch

Red Hat writes:
openssl: openssl: Denial of Service via crafted CMP certificate revocation response the claim

What it is to other things

In words only, so not counted until a person confirms one:

affectsopenssl/openssl
NVD says “OpenSSL · OpenSSL”
made_byopenssl
NVD says “OpenSSL”

What each source says

PropertySourceSaidMeans here
Cvss
cvss
conflict		GitHub advisories5.3
receipt
Source
GitHub advisories
Its words
5.3
Read by
field:cvss.score
Said since
2026-10-02 11:59 UTC
Original
open at the source
What the source handed over
{
  "credits": [],
  "cve_id": "CVE-2026-75805",
  "cvss": {
    "score": 5.3,
    "vector_string": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"
  },
  "cvss_severities": {
    "cvss_v3": {
      "score": 5.3,
      "vector_string": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"
    },
    "cvss_v4": {
      "score": 0.0,
      "vector_string": null
    }
  },
  "cwes": [
    {
      "cwe_id": "CWE-476",
      "name": "NULL Pointer Dereference"
    }
  ],
  "description": "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.",
  "epss": {
    "percentage": 0.00222,
    "percentile": 0.11535
  },
  "ghsa_id": "GHSA-gpg3-m652-f2vc",
  "github_reviewed_at": null,
  "html_url": "https://github.com/advisories/GHSA-gpg3-m652-f2vc",
  "identifiers": [
    {
      "type": "GHSA",
      "value": "GHSA-gpg3-m652-f2vc"
    },
    {
      "type": "CVE",
      "value": "CVE-2026-75805"
    }
  ],
  "nvd_published_at": "2026-09-29T16:17:11Z",
  "published_at": "2026-09-29T18:31:44Z",
  "references": [
    "https://nvd.nist.gov/vuln/detail/CVE-2026-75805",
    "https://github.com/openssl/openssl/commit/7588db7fef14209c3caa3a101d11a02006b19166",
    "https://github.com/openssl/openssl/commit/7ca0ccb5172a577e9b87267d77bfe21e5481a5e7",
    "https://github.com/openssl/openssl/commit/9eb2a8a9b86136cdb39d6d7d50644dd66941cdc3",
    "https://github.com/openssl/openssl/commit/abf02872a4b71767ecc72293424420f5b009190f",
    "https://openssl-library.org/news/secadv/20260929.txt",
    "https://github.com/advisories/GHSA-gpg3-m652-f2vc"
  ],
  "repository_advisory_url": null,
  "severity": "medium",
  "source_code_location": "",
  "summary": "Issue summary: A CMP client that requests certificate revocation on the basis\nof a PKCS#10 CSR...",
  "type": "unreviewed",
  "updated_at": "2026-09-29T18:31:49Z",
  "url": "https://api.github.com/advisories/GHSA-gpg3-m652-f2vc",
  "vulnerabilities": [],
  "withdrawn_at": null
}
—
Cvss
cvss
conflict		NVD5.3
receipt
Source
NVD
Its words
5.3
Read by
field:cve.metrics.cvssMetricV31[].cvssData.baseScore
Said since
2026-09-29 17:49 UTC
Last answered
2026-10-04 06:13 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": "Awaiting Analysis",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-476"
          }
        ],
        "source": "openssl-security@openssl.org",
        "type": "Secondary"
      }
    ]
  }
}
—
Cvss
cvss
conflict		Red Hat5.9
receipt
Source
Red Hat
Its words
5.9
Read by
field:cvss3_score
Said since
2026-10-02 12:01 UTC
Last answered
2026-10-04 06:13 UTC
Original
open at the source
What the source handed over
{
  "CVE": "CVE-2026-75805",
  "CWE": "CWE-476",
  "advisories": [
    "RHSA-2026:74162",
    "RHSA-2026:74166"
  ],
  "affected_packages": [
    "openssl-main-3.5.9-0.1.hum1",
    "openssl3-main-3.5.9-0.1.hum1"
  ],
  "bugzilla": "2543247",
  "bugzilla_description": "openssl: openssl: Denial of Service via crafted CMP certificate revocation response",
  "cvss3_score": "5.9",
  "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
  "cvss_score": null,
  "cvss_scoring_vector": null,
  "package_state": null,
  "public_date": "2026-09-29T15:32:20Z",
  "resource_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-75805.json",
  "severity": "moderate"
}
—
Cwe
cwe
GitHub advisoriesCWE-476
receipt
Source
GitHub advisories
Its words
CWE-476
Read by
field:cwes[].cwe_id
Said since
2026-10-02 11:59 UTC
Original
open at the source
What the source handed over
{
  "credits": [],
  "cve_id": "CVE-2026-75805",
  "cvss": {
    "score": 5.3,
    "vector_string": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"
  },
  "cvss_severities": {
    "cvss_v3": {
      "score": 5.3,
      "vector_string": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"
    },
    "cvss_v4": {
      "score": 0.0,
      "vector_string": null
    }
  },
  "cwes": [
    {
      "cwe_id": "CWE-476",
      "name": "NULL Pointer Dereference"
    }
  ],
  "description": "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.",
  "epss": {
    "percentage": 0.00222,
    "percentile": 0.11535
  },
  "ghsa_id": "GHSA-gpg3-m652-f2vc",
  "github_reviewed_at": null,
  "html_url": "https://github.com/advisories/GHSA-gpg3-m652-f2vc",
  "identifiers": [
    {
      "type": "GHSA",
      "value": "GHSA-gpg3-m652-f2vc"
    },
    {
      "type": "CVE",
      "value": "CVE-2026-75805"
    }
  ],
  "nvd_published_at": "2026-09-29T16:17:11Z",
  "published_at": "2026-09-29T18:31:44Z",
  "references": [
    "https://nvd.nist.gov/vuln/detail/CVE-2026-75805",
    "https://github.com/openssl/openssl/commit/7588db7fef14209c3caa3a101d11a02006b19166",
    "https://github.com/openssl/openssl/commit/7ca0ccb5172a577e9b87267d77bfe21e5481a5e7",
    "https://github.com/openssl/openssl/commit/9eb2a8a9b86136cdb39d6d7d50644dd66941cdc3",
    "https://github.com/openssl/openssl/commit/abf02872a4b71767ecc72293424420f5b009190f",
    "https://openssl-library.org/news/secadv/20260929.txt",
    "https://github.com/advisories/GHSA-gpg3-m652-f2vc"
  ],
  "repository_advisory_url": null,
  "severity": "medium",
  "source_code_location": "",
  "summary": "Issue summary: A CMP client that requests certificate revocation on the basis\nof a PKCS#10 CSR...",
  "type": "unreviewed",
  "updated_at": "2026-09-29T18:31:49Z",
  "url": "https://api.github.com/advisories/GHSA-gpg3-m652-f2vc",
  "vulnerabilities": [],
  "withdrawn_at": null
}
—
Cwe
cwe
Red HatCWE-476
receipt
Source
Red Hat
Its words
CWE-476
Read by
field:CWE
Said since
2026-10-02 12:01 UTC
Last answered
2026-10-04 06:13 UTC
Original
open at the source
What the source handed over
{
  "CVE": "CVE-2026-75805",
  "CWE": "CWE-476",
  "advisories": [
    "RHSA-2026:74162",
    "RHSA-2026:74166"
  ],
  "affected_packages": [
    "openssl-main-3.5.9-0.1.hum1",
    "openssl3-main-3.5.9-0.1.hum1"
  ],
  "bugzilla": "2543247",
  "bugzilla_description": "openssl: openssl: Denial of Service via crafted CMP certificate revocation response",
  "cvss3_score": "5.9",
  "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
  "cvss_score": null,
  "cvss_scoring_vector": null,
  "package_state": null,
  "public_date": "2026-09-29T15:32:20Z",
  "resource_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-75805.json",
  "severity": "moderate"
}
—
Packages
packages
Red Hatopenssl-main-3.5.9-0.1.hum1, openssl3-main-3.5.9-0.1.hum1
receipt
Source
Red Hat
Its words
openssl-main-3.5.9-0.1.hum1, openssl3-main-3.5.9-0.1.hum1
Read by
field:affected_packages[]
Said since
2026-10-02 12:01 UTC
Last answered
2026-10-04 06:13 UTC
Original
open at the source
What the source handed over
{
  "CVE": "CVE-2026-75805",
  "CWE": "CWE-476",
  "advisories": [
    "RHSA-2026:74162",
    "RHSA-2026:74166"
  ],
  "affected_packages": [
    "openssl-main-3.5.9-0.1.hum1",
    "openssl3-main-3.5.9-0.1.hum1"
  ],
  "bugzilla": "2543247",
  "bugzilla_description": "openssl: openssl: Denial of Service via crafted CMP certificate revocation response",
  "cvss3_score": "5.9",
  "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
  "cvss_score": null,
  "cvss_scoring_vector": null,
  "package_state": null,
  "public_date": "2026-09-29T15:32:20Z",
  "resource_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-75805.json",
  "severity": "moderate"
}
—
Product
product
NVDOpenSSL
receipt
Source
NVD
Its words
OpenSSL
Read by
field:cve.affected[].affectedData[].product
Said since
2026-09-29 17:49 UTC
Last answered
2026-10-04 06:13 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": "Awaiting Analysis",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-476"
          }
        ],
        "source": "openssl-security@openssl.org",
        "type": "Secondary"
      }
    ]
  }
}
—
Severity
severity
GitHub advisoriesmedium
receipt
Source
GitHub advisories
Its words
medium
Read by
field:severity
Said since
2026-10-02 11:59 UTC
Original
open at the source
What the source handed over
{
  "credits": [],
  "cve_id": "CVE-2026-75805",
  "cvss": {
    "score": 5.3,
    "vector_string": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"
  },
  "cvss_severities": {
    "cvss_v3": {
      "score": 5.3,
      "vector_string": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"
    },
    "cvss_v4": {
      "score": 0.0,
      "vector_string": null
    }
  },
  "cwes": [
    {
      "cwe_id": "CWE-476",
      "name": "NULL Pointer Dereference"
    }
  ],
  "description": "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.",
  "epss": {
    "percentage": 0.00222,
    "percentile": 0.11535
  },
  "ghsa_id": "GHSA-gpg3-m652-f2vc",
  "github_reviewed_at": null,
  "html_url": "https://github.com/advisories/GHSA-gpg3-m652-f2vc",
  "identifiers": [
    {
      "type": "GHSA",
      "value": "GHSA-gpg3-m652-f2vc"
    },
    {
      "type": "CVE",
      "value": "CVE-2026-75805"
    }
  ],
  "nvd_published_at": "2026-09-29T16:17:11Z",
  "published_at": "2026-09-29T18:31:44Z",
  "references": [
    "https://nvd.nist.gov/vuln/detail/CVE-2026-75805",
    "https://github.com/openssl/openssl/commit/7588db7fef14209c3caa3a101d11a02006b19166",
    "https://github.com/openssl/openssl/commit/7ca0ccb5172a577e9b87267d77bfe21e5481a5e7",
    "https://github.com/openssl/openssl/commit/9eb2a8a9b86136cdb39d6d7d50644dd66941cdc3",
    "https://github.com/openssl/openssl/commit/abf02872a4b71767ecc72293424420f5b009190f",
    "https://openssl-library.org/news/secadv/20260929.txt",
    "https://github.com/advisories/GHSA-gpg3-m652-f2vc"
  ],
  "repository_advisory_url": null,
  "severity": "medium",
  "source_code_location": "",
  "summary": "Issue summary: A CMP client that requests certificate revocation on the basis\nof a PKCS#10 CSR...",
  "type": "unreviewed",
  "updated_at": "2026-09-29T18:31:49Z",
  "url": "https://api.github.com/advisories/GHSA-gpg3-m652-f2vc",
  "vulnerabilities": [],
  "withdrawn_at": null
}
—
Severity
severity
Red Hatmoderate
A flaw that is harder to exploit, or whose impact is limited.
receipt
Source
Red Hat
Its words
moderate
Read by
field:severity
Said since
2026-10-02 12:01 UTC
Last answered
2026-10-04 06:13 UTC
Original
open at the source
What the source handed over
{
  "CVE": "CVE-2026-75805",
  "CWE": "CWE-476",
  "advisories": [
    "RHSA-2026:74162",
    "RHSA-2026:74166"
  ],
  "affected_packages": [
    "openssl-main-3.5.9-0.1.hum1",
    "openssl3-main-3.5.9-0.1.hum1"
  ],
  "bugzilla": "2543247",
  "bugzilla_description": "openssl: openssl: Denial of Service via crafted CMP certificate revocation response",
  "cvss3_score": "5.9",
  "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
  "cvss_score": null,
  "cvss_scoring_vector": null,
  "package_state": null,
  "public_date": "2026-09-29T15:32:20Z",
  "resource_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-75805.json",
  "severity": "moderate"
}
medium
Status
status
NVDAwaiting Analysis
receipt
Source
NVD
Its words
Awaiting Analysis
Read by
field:cve.vulnStatus
Said since
2026-10-02 12:00 UTC
Last answered
2026-10-04 06:13 UTC
Original
open at the source
2026-10-02 12:00 UTCAwaiting Analysis
2026-09-29 17:49 UTCReceived
What the source handed over
{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "defaultStatus": "unaffected",
            "product": "OpenSSL",
            "vendor": "OpenSSL",
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                "status": "affected",
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              {
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                "status": "affected",
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      }
    ],
    "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": {
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              {
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              },
              {
                "technicalImpact": "partial"
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            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-09-29T16:54:03.315064Z",
            "version": "2.0.3"
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    },
    "published": "2026-09-29T16:17:11.063",
    "references": [
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      },
      {
        "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": "Awaiting Analysis",
    "weaknesses": [
      {
        "description": [
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            "value": "CWE-476"
          }
        ],
        "source": "openssl-security@openssl.org",
        "type": "Secondary"
      }
    ]
  }
}
—
Vendor
vendor
NVDOpenSSL
receipt
Source
NVD
Its words
OpenSSL
Read by
field:cve.affected[].affectedData[].vendor
Said since
2026-09-29 17:49 UTC
Last answered
2026-10-04 06:13 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": "Awaiting Analysis",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-476"
          }
        ],
        "source": "openssl-security@openssl.org",
        "type": "Secondary"
      }
    ]
  }
}
—

vulnerability

openssl: openssl: Denial of Service via crafted CMP certificate revocation response
zetlyn/cve-redhat · 2026-09-29
cvss 5.9 cwe CWE-476 packages openssl-main-3.5.9-0.1.hum1, openssl3-main-3.5.9-0.1.hum1 severity moderate source
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 · 2026-09-29
cvss 5.3 product OpenSSL status Awaiting Analysis vendor OpenSSL source
Issue summary: A CMP client that requests certificate revocation on the basis of a PKCS#10 CSR...
zetlyn/cve-ghsa · 2026-09-29
cvss 5.3 cwe CWE-476 severity medium source