FKIE_CVE-2026-35189

Vulnerability from fkie_nvd - Published: 2026-09-29 16:17 - Updated: 2026-09-29 21:27
Severity
Summary
Issue summary: A certificate with many nameRelativeToCRLIssuer CRL distribution points causes disproportionate heap growth when OpenSSL caches X.509 extensions. Impact summary: Receiving a crafted certificate from a malicious peer can lead to significant memory pressure and possible Denial of Service in clients or in servers that solicit client certificates. CWE: CWE-770: Allocation of Resources Without Limits or Throttling Description: A certificate or a set of certificates that fits under the limit for size of certificates accepted from the peer (~100 KiB) can result in allocation of several hundred MiB of resident memory on the receiving side during a normal TLS handshake. This may be enough to crash the client or server, if multiple concurrent connections lead to similarly large memory allocations. The fix postpones processing of the CRL distribution points extensions in certificates to the time when the processed value is required for CRL processing. This avoids keeping large memory allocations for a long time when such certificates are received. FIPS impact: no The affected code is outside the FIPS module boundary.
References
openssl-security@openssl.orghttps://github.com/openssl/openssl/commit/2b93c73b2c70ddc4c61c5e4bfaaa6bd71379eb84
openssl-security@openssl.orghttps://github.com/openssl/openssl/commit/3842516cc15e8b2cf55747011045e77547e71d89
openssl-security@openssl.orghttps://github.com/openssl/openssl/commit/8e0efc7549b7ff8246d40e585e3fd604f728473f
openssl-security@openssl.orghttps://github.com/openssl/openssl/commit/c72ae182cac17a82e4246c6ecd4e9c4ec3586ec9
openssl-security@openssl.orghttps://openssl-library.org/news/secadv/20260929.txt
Impacted products
Vendor Product Version
To clipboard 

{
  "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"
            },
            {
              "lessThan": "1.1.1zj",
              "status": "affected",
              "version": "1.1.1",
              "versionType": "custom"
            },
            {
              "lessThan": "1.0.2zs",
              "status": "affected",
              "version": "1.0.2",
              "versionType": "custom"
            }
          ]
        }
      ],
      "source": "openssl-security@openssl.org"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Issue summary: A certificate with many nameRelativeToCRLIssuer CRL\ndistribution points causes disproportionate heap growth when OpenSSL caches\nX.509 extensions.\n\nImpact summary: Receiving a crafted certificate from a malicious peer can lead\nto significant memory pressure and possible Denial of Service in clients or\nin servers that solicit client certificates.\n\nCWE: CWE-770: Allocation of Resources Without Limits or Throttling\n\nDescription: A certificate or a set of certificates that fits under the limit for\nsize of certificates accepted from the peer (~100 KiB) can result in allocation\nof several hundred MiB of resident memory on the receiving side\nduring a normal TLS handshake.  This may be enough to crash the client or\nserver, if multiple concurrent connections lead to similarly large memory\nallocations.\n\nThe fix postpones processing of the CRL distribution points extensions in\ncertificates to the time when the processed value is required for CRL processing.\nThis avoids keeping large memory allocations for a long time when such\ncertificates are received.\n\nFIPS impact: no\nThe affected code is outside the FIPS module boundary."
    }
  ],
  "id": "CVE-2026-35189",
  "lastModified": "2026-09-29T21:27:41.130",
  "metrics": {},
  "published": "2026-09-29T16:17:07.330",
  "references": [
    {
      "source": "openssl-security@openssl.org",
      "url": "https://github.com/openssl/openssl/commit/2b93c73b2c70ddc4c61c5e4bfaaa6bd71379eb84"
    },
    {
      "source": "openssl-security@openssl.org",
      "url": "https://github.com/openssl/openssl/commit/3842516cc15e8b2cf55747011045e77547e71d89"
    },
    {
      "source": "openssl-security@openssl.org",
      "url": "https://github.com/openssl/openssl/commit/8e0efc7549b7ff8246d40e585e3fd604f728473f"
    },
    {
      "source": "openssl-security@openssl.org",
      "url": "https://github.com/openssl/openssl/commit/c72ae182cac17a82e4246c6ecd4e9c4ec3586ec9"
    },
    {
      "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-770"
        }
      ],
      "source": "openssl-security@openssl.org",
      "type": "Secondary"
    }
  ]
}



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Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.