{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "4.0.0"
              },
              {
                "fixed": "4.0.3"
              },
              {
                "introduced": "3.6.0"
              },
              {
                "fixed": "3.6.5"
              },
              {
                "introduced": "3.5.0"
              },
              {
                "fixed": "3.5.9"
              },
              {
                "introduced": "3.4.0"
              },
              {
                "fixed": "3.4.8"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "11b7b6ea3b65a584e1d31408ed1bdb139465cffd"
            },
            {
              "introduced": "7b371d80d959ec9ab4139d09d78e83c090de9779"
            },
            {
              "introduced": "636dfadc70ce26f2473870570bfd9ec352806b1d"
            },
            {
              "introduced": "98acb6b02839c609ef5b837794e08d906d965335"
            },
            {
              "fixed": "af1775b60dfa141a4ad762585052cabeb9f37e9e"
            },
            {
              "fixed": "c8bd5a57108599ac650bbae77fcabe3109dab2e8"
            },
            {
              "fixed": "45e844fa2a14ec92d146bd8f5778ac130b6625fb"
            },
            {
              "fixed": "e72c946f6f6d94c8ba5119acb25340b7b6b2073f"
            },
            {
              "fixed": "7588db7fef14209c3caa3a101d11a02006b19166"
            },
            {
              "fixed": "7ca0ccb5172a577e9b87267d77bfe21e5481a5e7"
            },
            {
              "fixed": "9eb2a8a9b86136cdb39d6d7d50644dd66941cdc3"
            },
            {
              "fixed": "abf02872a4b71767ecc72293424420f5b009190f"
            }
          ],
          "repo": "https://github.com/openssl/openssl",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "openssl",
    "cwe_ids": [
      "CWE-476"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/75xxx/CVE-2026-75805.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "introduced": "3.0.0"
          },
          {
            "fixed": "3.0.23"
          }
        ],
        "source": "AFFECTED_FIELD"
      }
    ]
  },
  "details": "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 \u003cfile\u003e' 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",
  "modified": "2026-10-01T03:30:41.743232792Z",
  "published": "2026-09-29T15:32:20.408Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/75xxx/CVE-2026-75805.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-75805"
    },
    {
      "type": "ADVISORY",
      "url": "https://openssl-library.org/news/secadv/20260929.txt"
    },
    {
      "type": "FIX",
      "url": "https://github.com/openssl/openssl/commit/7588db7fef14209c3caa3a101d11a02006b19166"
    },
    {
      "type": "FIX",
      "url": "https://github.com/openssl/openssl/commit/7ca0ccb5172a577e9b87267d77bfe21e5481a5e7"
    },
    {
      "type": "FIX",
      "url": "https://github.com/openssl/openssl/commit/9eb2a8a9b86136cdb39d6d7d50644dd66941cdc3"
    },
    {
      "type": "FIX",
      "url": "https://github.com/openssl/openssl/commit/abf02872a4b71767ecc72293424420f5b009190f"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "NULL Pointer Dereference in CMP Client Revocation Response Handling"
}