Loop with unreachable exit condition in the PKCS#12 key derivation (Pkcs12ParametersGenerator) in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows an attacker who can supply a PKCS#12 (PFX) file, or a PKCS#8 encrypted private key that uses a PKCS#12 password-based encryption algorithm, to cause a denial of service through CPU exhaustion via an iteration count of zero or below, because the derivation loop ran until its counter equalled the count, so for such a count it wrapped through about 2^32 iterations before the MAC or the password could be checked. A 75-byte PFX file with a negative MacData iteration count kept Pkcs12Store.Load busy for many minutes.

cve CVE-2026-63575 2 sources, 2 claims · Watch

NVD writes:
Loop with unreachable exit condition in the PKCS#12 key derivation (Pkcs12ParametersGenerator) in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows an attacker who can supply a PKCS#12 (PFX) file, or a PKCS#8 encrypted private key that uses a PKCS#12 password-based encryption algorithm, to cause a denial of service through CPU exhaustion via an iteration count of zero or below, because the derivation loop ran until its counter equalled the count, so for such a count it wrapped through about 2^32 iterations before the MAC or the password could be checked. A 75-byte PFX file with a … the claim

What it is to other things

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

affectslegion_of_the_bouncy_castle_inc/bc_csharp
NVD says “Legion of the Bouncy Castle Inc. · bc-csharp”
made_bylegion_of_the_bouncy_castle_inc
NVD says “Legion of the Bouncy Castle Inc.”

What each source says

PropertySourceSaidMeans here
Cwe
cwe
GitHub advisoriesCWE-835
receipt
Source
GitHub advisories
Its words
CWE-835
Read by
field:cwes[].cwe_id
Said since
2026-10-02 11:59 UTC
Last answered
2026-10-04 18:15 UTC
Original
open at the source
What the source handed over
{
  "credits": [],
  "cve_id": "CVE-2026-63575",
  "cvss": {
    "score": null,
    "vector_string": null
  },
  "cvss_severities": {
    "cvss_v3": {
      "score": 0.0,
      "vector_string": null
    },
    "cvss_v4": {
      "score": 7.1,
      "vector_string": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"
    }
  },
  "cwes": [
    {
      "cwe_id": "CWE-835",
      "name": "Loop with Unreachable Exit Condition ('Infinite Loop')"
    }
  ],
  "description": "Loop with unreachable exit condition in the PKCS#12 key derivation (Pkcs12ParametersGenerator) in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows an attacker who can supply a PKCS#12 (PFX) file, or a PKCS#8 encrypted private key that uses a PKCS#12 password-based encryption algorithm, to cause a denial of service through CPU exhaustion via an iteration count of zero or below, because the derivation loop ran until its counter equalled the count, so for such a count it wrapped through about 2^32 iterations before the MAC or the password could be checked. A 75-byte PFX file with a negative MacData iteration count kept Pkcs12Store.Load busy for many minutes.",
  "ghsa_id": "GHSA-7c84-x75c-5j8m",
  "github_reviewed_at": null,
  "html_url": "https://github.com/advisories/GHSA-7c84-x75c-5j8m",
  "identifiers": [
    {
      "type": "GHSA",
      "value": "GHSA-7c84-x75c-5j8m"
    },
    {
      "type": "CVE",
      "value": "CVE-2026-63575"
    }
  ],
  "nvd_published_at": "2026-10-02T08:17:02Z",
  "published_at": "2026-10-02T09:31:19Z",
  "references": [
    "https://nvd.nist.gov/vuln/detail/CVE-2026-63575",
    "https://github.com/bcgit/bc-csharp/commit/0c7a6dfd64c4a479577e35a728a766721b79aba7",
    "https://github.com/bcgit/bc-csharp/commit/7c0ed15f9783c9595b1a53f3900136461fd944f4",
    "https://github.com/bcgit/bc-csharp/wiki/CVE-2026-63575",
    "https://github.com/advisories/GHSA-7c84-x75c-5j8m"
  ],
  "repository_advisory_url": null,
  "severity": "high",
  "source_code_location": "",
  "summary": "Loop with unreachable exit condition in the PKCS#12 key derivation (Pkcs12ParametersGenerator) in...",
  "type": "unreviewed",
  "updated_at": "2026-10-02T09:31:30Z",
  "url": "https://api.github.com/advisories/GHSA-7c84-x75c-5j8m",
  "vulnerabilities": [],
  "withdrawn_at": null
}
—
Product
product
NVDbc-csharp
receipt
Source
NVD
Its words
bc-csharp
Read by
field:cve.affected[].affectedData[].product
Said since
2026-10-02 12:00 UTC
Last answered
2026-10-04 18:16 UTC
Original
open at the source
What the source handed over
{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "collectionURL": "https://www.nuget.org/packages/BouncyCastle.Cryptography",
            "defaultStatus": "unaffected",
            "packageName": "BouncyCastle.Cryptography",
            "product": "bc-csharp",
            "programFiles": [
              "crypto/src/crypto/generators/Pkcs12ParametersGenerator.cs",
              "crypto/src/security/PbeUtilities.cs",
              "crypto/src/pkcs/Pkcs12Store.cs"
            ],
            "repo": "https://github.com/bcgit/bc-csharp",
            "vendor": "Legion of the Bouncy Castle Inc.",
            "versions": [
              {
                "lessThan": "2.7.0",
                "status": "affected",
                "version": "0",
                "versionType": "semver"
              }
            ]
          }
        ],
        "source": "91579145-5d7b-4cc5-b925-a0262ff19630"
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "Loop with unreachable exit condition in the PKCS#12 key derivation (Pkcs12ParametersGenerator) in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows an attacker who can supply a PKCS#12 (PFX) file, or a PKCS#8 encrypted private key that uses a PKCS#12 password-based encryption algorithm, to cause a denial of service through CPU exhaustion via an iteration count of zero or below, because the derivation loop ran until its counter equalled the count, so for such a count it wrapped through about 2^32 iterations before the MAC or the password could be checked. A 75-byte PFX file with a negative MacData iteration count kept Pkcs12Store.Load busy for many minutes."
      }
    ],
    "id": "CVE-2026-63575",
    "lastModified": "2026-10-02T20:17:03.583",
    "metrics": {
      "cvssMetricV40": [
        {
          "cvssData": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "availabilityRequirement": "NOT_DEFINED",
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "confidentialityRequirement": "NOT_DEFINED",
            "exploitMaturity": "NOT_DEFINED",
            "integrityRequirement": "NOT_DEFINED",
            "modifiedAttackComplexity": "NOT_DEFINED",
            "modifiedAttackRequirements": "NOT_DEFINED",
            "modifiedAttackVector": "NOT_DEFINED",
            "modifiedPrivilegesRequired": "NOT_DEFINED",
            "modifiedSubAvailabilityImpact": "NOT_DEFINED",
            "modifiedSubConfidentialityImpact": "NOT_DEFINED",
            "modifiedSubIntegrityImpact": "NOT_DEFINED",
            "modifiedUserInteraction": "NOT_DEFINED",
            "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
            "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
            "modifiedVulnIntegrityImpact": "NOT_DEFINED",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "PASSIVE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "source": "91579145-5d7b-4cc5-b925-a0262ff19630",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2026-63575",
            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "no"
              },
              {
                "technicalImpact": "partial"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-10-02T19:25:09.895774Z",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-10-02T08:17:02.643",
    "references": [
      {
        "source": "91579145-5d7b-4cc5-b925-a0262ff19630",
        "url": "https://github.com/bcgit/bc-csharp/commit/0c7a6dfd64c4a479577e35a728a766721b79aba7"
      },
      {
        "source": "91579145-5d7b-4cc5-b925-a0262ff19630",
        "url": "https://github.com/bcgit/bc-csharp/commit/7c0ed15f9783c9595b1a53f3900136461fd944f4"
      },
      {
        "source": "91579145-5d7b-4cc5-b925-a0262ff19630",
        "url": "https://github.com/bcgit/bc-csharp/wiki/CVE-2026-63575"
      }
    ],
    "sourceIdentifier": "91579145-5d7b-4cc5-b925-a0262ff19630",
    "vulnStatus": "Undergoing Analysis",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-835"
          }
        ],
        "source": "91579145-5d7b-4cc5-b925-a0262ff19630",
        "type": "Secondary"
      }
    ]
  }
}
—
Severity
severity
GitHub advisorieshigh
From 7.0 to 8.9.
receipt
Source
GitHub advisories
Its words
high
Read by
field:severity
Said since
2026-10-02 11:59 UTC
Last answered
2026-10-04 18:15 UTC
Original
open at the source
What the source handed over
{
  "credits": [],
  "cve_id": "CVE-2026-63575",
  "cvss": {
    "score": null,
    "vector_string": null
  },
  "cvss_severities": {
    "cvss_v3": {
      "score": 0.0,
      "vector_string": null
    },
    "cvss_v4": {
      "score": 7.1,
      "vector_string": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"
    }
  },
  "cwes": [
    {
      "cwe_id": "CWE-835",
      "name": "Loop with Unreachable Exit Condition ('Infinite Loop')"
    }
  ],
  "description": "Loop with unreachable exit condition in the PKCS#12 key derivation (Pkcs12ParametersGenerator) in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows an attacker who can supply a PKCS#12 (PFX) file, or a PKCS#8 encrypted private key that uses a PKCS#12 password-based encryption algorithm, to cause a denial of service through CPU exhaustion via an iteration count of zero or below, because the derivation loop ran until its counter equalled the count, so for such a count it wrapped through about 2^32 iterations before the MAC or the password could be checked. A 75-byte PFX file with a negative MacData iteration count kept Pkcs12Store.Load busy for many minutes.",
  "ghsa_id": "GHSA-7c84-x75c-5j8m",
  "github_reviewed_at": null,
  "html_url": "https://github.com/advisories/GHSA-7c84-x75c-5j8m",
  "identifiers": [
    {
      "type": "GHSA",
      "value": "GHSA-7c84-x75c-5j8m"
    },
    {
      "type": "CVE",
      "value": "CVE-2026-63575"
    }
  ],
  "nvd_published_at": "2026-10-02T08:17:02Z",
  "published_at": "2026-10-02T09:31:19Z",
  "references": [
    "https://nvd.nist.gov/vuln/detail/CVE-2026-63575",
    "https://github.com/bcgit/bc-csharp/commit/0c7a6dfd64c4a479577e35a728a766721b79aba7",
    "https://github.com/bcgit/bc-csharp/commit/7c0ed15f9783c9595b1a53f3900136461fd944f4",
    "https://github.com/bcgit/bc-csharp/wiki/CVE-2026-63575",
    "https://github.com/advisories/GHSA-7c84-x75c-5j8m"
  ],
  "repository_advisory_url": null,
  "severity": "high",
  "source_code_location": "",
  "summary": "Loop with unreachable exit condition in the PKCS#12 key derivation (Pkcs12ParametersGenerator) in...",
  "type": "unreviewed",
  "updated_at": "2026-10-02T09:31:30Z",
  "url": "https://api.github.com/advisories/GHSA-7c84-x75c-5j8m",
  "vulnerabilities": [],
  "withdrawn_at": null
}
—
Status
status
NVDUndergoing Analysis
receipt
Source
NVD
Its words
Undergoing Analysis
Read by
field:cve.vulnStatus
Said since
2026-10-03 00:06 UTC
Last answered
2026-10-04 18:16 UTC
Original
open at the source
2026-10-03 00:06 UTCUndergoing Analysis
2026-10-02 18:03 UTCAwaiting Analysis
2026-10-02 12:00 UTCReceived
What the source handed over
{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "collectionURL": "https://www.nuget.org/packages/BouncyCastle.Cryptography",
            "defaultStatus": "unaffected",
            "packageName": "BouncyCastle.Cryptography",
            "product": "bc-csharp",
            "programFiles": [
              "crypto/src/crypto/generators/Pkcs12ParametersGenerator.cs",
              "crypto/src/security/PbeUtilities.cs",
              "crypto/src/pkcs/Pkcs12Store.cs"
            ],
            "repo": "https://github.com/bcgit/bc-csharp",
            "vendor": "Legion of the Bouncy Castle Inc.",
            "versions": [
              {
                "lessThan": "2.7.0",
                "status": "affected",
                "version": "0",
                "versionType": "semver"
              }
            ]
          }
        ],
        "source": "91579145-5d7b-4cc5-b925-a0262ff19630"
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "Loop with unreachable exit condition in the PKCS#12 key derivation (Pkcs12ParametersGenerator) in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows an attacker who can supply a PKCS#12 (PFX) file, or a PKCS#8 encrypted private key that uses a PKCS#12 password-based encryption algorithm, to cause a denial of service through CPU exhaustion via an iteration count of zero or below, because the derivation loop ran until its counter equalled the count, so for such a count it wrapped through about 2^32 iterations before the MAC or the password could be checked. A 75-byte PFX file with a negative MacData iteration count kept Pkcs12Store.Load busy for many minutes."
      }
    ],
    "id": "CVE-2026-63575",
    "lastModified": "2026-10-02T20:17:03.583",
    "metrics": {
      "cvssMetricV40": [
        {
          "cvssData": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "availabilityRequirement": "NOT_DEFINED",
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "confidentialityRequirement": "NOT_DEFINED",
            "exploitMaturity": "NOT_DEFINED",
            "integrityRequirement": "NOT_DEFINED",
            "modifiedAttackComplexity": "NOT_DEFINED",
            "modifiedAttackRequirements": "NOT_DEFINED",
            "modifiedAttackVector": "NOT_DEFINED",
            "modifiedPrivilegesRequired": "NOT_DEFINED",
            "modifiedSubAvailabilityImpact": "NOT_DEFINED",
            "modifiedSubConfidentialityImpact": "NOT_DEFINED",
            "modifiedSubIntegrityImpact": "NOT_DEFINED",
            "modifiedUserInteraction": "NOT_DEFINED",
            "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
            "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
            "modifiedVulnIntegrityImpact": "NOT_DEFINED",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "PASSIVE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "source": "91579145-5d7b-4cc5-b925-a0262ff19630",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2026-63575",
            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "no"
              },
              {
                "technicalImpact": "partial"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-10-02T19:25:09.895774Z",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-10-02T08:17:02.643",
    "references": [
      {
        "source": "91579145-5d7b-4cc5-b925-a0262ff19630",
        "url": "https://github.com/bcgit/bc-csharp/commit/0c7a6dfd64c4a479577e35a728a766721b79aba7"
      },
      {
        "source": "91579145-5d7b-4cc5-b925-a0262ff19630",
        "url": "https://github.com/bcgit/bc-csharp/commit/7c0ed15f9783c9595b1a53f3900136461fd944f4"
      },
      {
        "source": "91579145-5d7b-4cc5-b925-a0262ff19630",
        "url": "https://github.com/bcgit/bc-csharp/wiki/CVE-2026-63575"
      }
    ],
    "sourceIdentifier": "91579145-5d7b-4cc5-b925-a0262ff19630",
    "vulnStatus": "Undergoing Analysis",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-835"
          }
        ],
        "source": "91579145-5d7b-4cc5-b925-a0262ff19630",
        "type": "Secondary"
      }
    ]
  }
}
—
Vendor
vendor
NVDLegion of the Bouncy Castle Inc.
receipt
Source
NVD
Its words
Legion of the Bouncy Castle Inc.
Read by
field:cve.affected[].affectedData[].vendor
Said since
2026-10-02 12:00 UTC
Last answered
2026-10-04 18:16 UTC
Original
open at the source
What the source handed over
{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "collectionURL": "https://www.nuget.org/packages/BouncyCastle.Cryptography",
            "defaultStatus": "unaffected",
            "packageName": "BouncyCastle.Cryptography",
            "product": "bc-csharp",
            "programFiles": [
              "crypto/src/crypto/generators/Pkcs12ParametersGenerator.cs",
              "crypto/src/security/PbeUtilities.cs",
              "crypto/src/pkcs/Pkcs12Store.cs"
            ],
            "repo": "https://github.com/bcgit/bc-csharp",
            "vendor": "Legion of the Bouncy Castle Inc.",
            "versions": [
              {
                "lessThan": "2.7.0",
                "status": "affected",
                "version": "0",
                "versionType": "semver"
              }
            ]
          }
        ],
        "source": "91579145-5d7b-4cc5-b925-a0262ff19630"
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "Loop with unreachable exit condition in the PKCS#12 key derivation (Pkcs12ParametersGenerator) in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows an attacker who can supply a PKCS#12 (PFX) file, or a PKCS#8 encrypted private key that uses a PKCS#12 password-based encryption algorithm, to cause a denial of service through CPU exhaustion via an iteration count of zero or below, because the derivation loop ran until its counter equalled the count, so for such a count it wrapped through about 2^32 iterations before the MAC or the password could be checked. A 75-byte PFX file with a negative MacData iteration count kept Pkcs12Store.Load busy for many minutes."
      }
    ],
    "id": "CVE-2026-63575",
    "lastModified": "2026-10-02T20:17:03.583",
    "metrics": {
      "cvssMetricV40": [
        {
          "cvssData": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "availabilityRequirement": "NOT_DEFINED",
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "confidentialityRequirement": "NOT_DEFINED",
            "exploitMaturity": "NOT_DEFINED",
            "integrityRequirement": "NOT_DEFINED",
            "modifiedAttackComplexity": "NOT_DEFINED",
            "modifiedAttackRequirements": "NOT_DEFINED",
            "modifiedAttackVector": "NOT_DEFINED",
            "modifiedPrivilegesRequired": "NOT_DEFINED",
            "modifiedSubAvailabilityImpact": "NOT_DEFINED",
            "modifiedSubConfidentialityImpact": "NOT_DEFINED",
            "modifiedSubIntegrityImpact": "NOT_DEFINED",
            "modifiedUserInteraction": "NOT_DEFINED",
            "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
            "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
            "modifiedVulnIntegrityImpact": "NOT_DEFINED",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "PASSIVE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "source": "91579145-5d7b-4cc5-b925-a0262ff19630",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2026-63575",
            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "no"
              },
              {
                "technicalImpact": "partial"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-10-02T19:25:09.895774Z",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-10-02T08:17:02.643",
    "references": [
      {
        "source": "91579145-5d7b-4cc5-b925-a0262ff19630",
        "url": "https://github.com/bcgit/bc-csharp/commit/0c7a6dfd64c4a479577e35a728a766721b79aba7"
      },
      {
        "source": "91579145-5d7b-4cc5-b925-a0262ff19630",
        "url": "https://github.com/bcgit/bc-csharp/commit/7c0ed15f9783c9595b1a53f3900136461fd944f4"
      },
      {
        "source": "91579145-5d7b-4cc5-b925-a0262ff19630",
        "url": "https://github.com/bcgit/bc-csharp/wiki/CVE-2026-63575"
      }
    ],
    "sourceIdentifier": "91579145-5d7b-4cc5-b925-a0262ff19630",
    "vulnStatus": "Undergoing Analysis",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-835"
          }
        ],
        "source": "91579145-5d7b-4cc5-b925-a0262ff19630",
        "type": "Secondary"
      }
    ]
  }
}
—

vulnerability

Loop with unreachable exit condition in the PKCS#12 key derivation (Pkcs12ParametersGenerator) in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows an attacker who can supply a PKCS#12 (PFX) file, or a PKCS#8 encrypted private key that uses a PKCS#12 password-based encryption algorithm, to cause a denial of service through CPU exhaustion via an iteration count of zero or below, because the derivation loop ran until its counter equalled the count, so for such a count it wrapped through about 2^32 iterations before the MAC or the password could be checked. A 75-byte PFX file with a negative MacData iteration count kept Pkcs12Store.Load busy for many minutes.
zetlyn/cve-nvd · 2026-10-02
product bc-csharp status Undergoing Analysis vendor Legion of the Bouncy Castle Inc. source
Loop with unreachable exit condition in the PKCS#12 key derivation (Pkcs12ParametersGenerator) in...
zetlyn/cve-ghsa · 2026-10-02
cwe CWE-835 severity high source