{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": [
              "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*",
              "cpe:2.3:a:openssl:openssl:4.0.0:-:*:*:*:*:*:*"
            ],
            "extracted_events": [
              {
                "introduced": "3.4.0"
              },
              {
                "fixed": "3.4.6"
              },
              {
                "introduced": "3.5.0"
              },
              {
                "fixed": "3.5.7"
              },
              {
                "introduced": "3.6.0"
              },
              {
                "fixed": "3.6.3"
              },
              {
                "introduced": "4.0.0-NA"
              },
              {
                "last_affected": "4.0.0-NA"
              }
            ],
            "source": [
              "CPE_RANGE",
              "CPE_STRING",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "98acb6b02839c609ef5b837794e08d906d965335"
            },
            {
              "fixed": "c5ea1cc227fd60afae8ac4b9438690bbe4888f79"
            },
            {
              "introduced": "636dfadc70ce26f2473870570bfd9ec352806b1d"
            },
            {
              "fixed": "8cf17aaeb4599f8af87fefd810b5b5fee90fe69e"
            },
            {
              "introduced": "7b371d80d959ec9ab4139d09d78e83c090de9779"
            },
            {
              "fixed": "aae016bfd52fcad2bc9657c2c782cfdf73b1ed5f"
            },
            {
              "introduced": "11b7b6ea3b65a584e1d31408ed1bdb139465cffd"
            },
            {
              "fixed": "0300eb9ddce7a0895bf301a4b0c03a9da2313a0f"
            },
            {
              "fixed": "79eb76a937e474bb7610a0a3dc57131dc8dc6610"
            },
            {
              "fixed": "85dcbb3abaa4878af5c8fbbe11bce708fcf984a7"
            },
            {
              "fixed": "ec36f2417c4ddd8cabce4b4a60a3d7a7365f2d81"
            }
          ],
          "repo": "https://github.com/openssl/openssl",
          "type": "GIT"
        }
      ],
      "versions": [
        "4.0.0-NA"
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "openssl",
    "cwe_ids": [
      "CWE-354"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34181.json"
  },
  "details": "Issue Summary: The PKCS#12 file processing fails to perform sufficient input\nvalidation for files that use Password-Based Message Authentication Code 1\n(PBMAC1) integrity mechanism allowing a certificate and private key forgery.\n\nImpact Summary: An attacker impersonating a user can cause a service reading\nPKCS#12 files to accept forged certificates and private keys with a 1 in 256\nprobability.\n\nIf a service accepting PKCS#12 files is using passwords for authenticating\nthe received files, the attacker can create unencrypted PKCS#12 files that\nuse PBMAC1 authentication that specifies an HMAC key of only one byte, allowing\nthem to craft a file that will be accepted with a 1 in 256 probability.\nThat would then cause the service to accept a certificate and private key\ncontrolled by the attacker.\n\nThe FIPS modules are not affected by this issue, as the affected code is\noutside the OpenSSL FIPS module boundary.",
  "id": "CVE-2026-34181",
  "modified": "2026-07-25T03:56:39.172606121Z",
  "published": "2026-06-09T16:03:22.065Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34181.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-34181"
    },
    {
      "type": "ADVISORY",
      "url": "https://openssl-library.org/news/secadv/20260609.txt"
    },
    {
      "type": "FIX",
      "url": "https://github.com/openssl/openssl/commit/0300eb9ddce7a0895bf301a4b0c03a9da2313a0f"
    },
    {
      "type": "FIX",
      "url": "https://github.com/openssl/openssl/commit/79eb76a937e474bb7610a0a3dc57131dc8dc6610"
    },
    {
      "type": "FIX",
      "url": "https://github.com/openssl/openssl/commit/85dcbb3abaa4878af5c8fbbe11bce708fcf984a7"
    },
    {
      "type": "FIX",
      "url": "https://github.com/openssl/openssl/commit/ec36f2417c4ddd8cabce4b4a60a3d7a7365f2d81"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "PKCS#12 Files with PBMAC1 Are Accepted with Short HMAC Keys"
}