{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "4.0.0"
              },
              {
                "fixed": "4.0.2"
              },
              {
                "introduced": "3.6.0"
              },
              {
                "fixed": "3.6.4"
              },
              {
                "introduced": "3.5.0"
              },
              {
                "fixed": "3.5.8"
              },
              {
                "introduced": "3.4.0"
              },
              {
                "fixed": "3.4.7"
              },
              {
                "introduced": "3.0.0"
              },
              {
                "fixed": "3.0.22"
              },
              {
                "introduced": "1.1.1"
              },
              {
                "fixed": "1.1.1zi"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "11b7b6ea3b65a584e1d31408ed1bdb139465cffd"
            },
            {
              "introduced": "7b371d80d959ec9ab4139d09d78e83c090de9779"
            },
            {
              "introduced": "636dfadc70ce26f2473870570bfd9ec352806b1d"
            },
            {
              "introduced": "98acb6b02839c609ef5b837794e08d906d965335"
            },
            {
              "introduced": "89cd17a031e022211684eb7eb41190cf1910f9fa"
            },
            {
              "introduced": "e04bd3433fd84e1861bf258ea37928d9845e6a86"
            },
            {
              "fixed": "f089acdf4bc7ba94a79f4bf6eb7362c3e7d14aa9"
            },
            {
              "fixed": "d3c1b1169b3569ff3069e5b399f47b2b28e03d79"
            },
            {
              "fixed": "f4dc4d58b48d346a8270183f89acf826d459b0ca"
            },
            {
              "fixed": "0c5d912057abf47505b4ad455da49fbab99b76f1"
            },
            {
              "fixed": "a279090b9cd6b682a5a178410765a63e619fa2d9"
            },
            {
              "fixed": "e04bd3433fd84e1861bf258ea37928d9845e6a86"
            },
            {
              "fixed": "2a3dac874c8057c1f0186849bf1ede1ae7b6b756"
            },
            {
              "fixed": "87784ad619af36b8807c2044b3940006fccc1e42"
            },
            {
              "fixed": "9530a5fd1aacaeccdced4478ea2340a480613335"
            },
            {
              "fixed": "9ec2f6d2ae2bcad907cf7ee38584855bafe4979a"
            },
            {
              "fixed": "a0c8ec557d9cac078f032d76cdf684fe743eb382"
            }
          ],
          "repo": "https://github.com/openssl/openssl",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "openssl",
    "cwe_ids": [
      "CWE-787"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63072.json"
  },
  "details": "Issue summary: OpenSSL CMS decryption sizes the key-unwrap output buffer based\non querying the unwrapped key size, but the AES-WRAP-PAD unwrap primitive\ncan write and cleanse more bytes than that query reports, causing an 8-byte\nout-of-bounds heap write.\n\nImpact summary: An attacker who supplies a crafted CMS message can trigger a\ndeterministic 8-byte out-of-bounds heap write when the victim decrypts it\nwith CMS_decrypt(), corrupting the heap and typically resulting in a Denial\nof Service.\n\nCWE: CWE-787: Out-of-bounds Write\n\nDescription: The key-wrap OID is potentially attacker-controlled on the wire.\nCMS unwrapping allows both id-aesNNN-wrap-pad and id-aesNNN-wrap ciphers.\nAn attacker can take a legitimate message and change a single OID byte to\nselect the padded variant while leaving the message otherwise valid. Since\nthe unwrap key is derived from the recipient's private operation (ECDH key\nagreement or ML-KEM decapsulation), the RFC 5649 integrity check cannot\npass, and the decryption fails with integrity failure.\n\nThe write is a fixed-size (8-byte), fixed-value (zero) heap overflow\nimmediately past the allocation, requires no special configuration, and is\nreachable from the public CMS_decrypt() function. The consequence is\na heap corruption leading to a Denial of Service. The fix in the CMS code\nsizes the unwrap output buffer for the worst case so a failed unwrap cannot\nwrite past the allocation.\n\nFIPS impact: no\n\nAs the CMS code lives outside the FIPS module boundary, no FIPS\nmodules are affected by this CVE.",
  "id": "CVE-2026-63072",
  "modified": "2026-08-30T03:30:39.980569565Z",
  "published": "2026-08-25T12:59:34.428Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63072.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-63072"
    },
    {
      "type": "ADVISORY",
      "url": "https://openssl-library.org/news/secadv/20260825.txt"
    },
    {
      "type": "FIX",
      "url": "https://github.com/openssl/openssl/commit/2a3dac874c8057c1f0186849bf1ede1ae7b6b756"
    },
    {
      "type": "FIX",
      "url": "https://github.com/openssl/openssl/commit/87784ad619af36b8807c2044b3940006fccc1e42"
    },
    {
      "type": "FIX",
      "url": "https://github.com/openssl/openssl/commit/9530a5fd1aacaeccdced4478ea2340a480613335"
    },
    {
      "type": "FIX",
      "url": "https://github.com/openssl/openssl/commit/9ec2f6d2ae2bcad907cf7ee38584855bafe4979a"
    },
    {
      "type": "FIX",
      "url": "https://github.com/openssl/openssl/commit/a0c8ec557d9cac078f032d76cdf684fe743eb382"
    }
  ],
  "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:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Heap Buffer Overflow in CMS Key Unwrapping"
}