{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "3.13.14"
              },
              {
                "introduced": "3.14.0"
              },
              {
                "fixed": "3.14.6"
              },
              {
                "introduced": "3.15.0a1"
              },
              {
                "fixed": "3.15.0b3"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "introduced": "ebf955df7a89ed0c7968f79faec1de49f61ed7cb"
            },
            {
              "introduced": "f31a89bb901067dd105b00cfa90523cf7ffdbbdd"
            },
            {
              "fixed": "fd17997c3866d61e0e7bd8201b1d8f35b40a40bd"
            },
            {
              "fixed": "c63aec69bd59c55314c06c23f4c22c03de76fe45"
            },
            {
              "fixed": "cf16a33fad15d1058ed71b92573d0bed57f85457"
            },
            {
              "fixed": "157a5df8cb5d82b33f918a7489e72ce95ceb12b6"
            },
            {
              "fixed": "5755d0f083949ff3c5bf3a37e673e24e306b036e"
            },
            {
              "fixed": "619a12b2e545391dc436b3af79dda22337382a6f"
            },
            {
              "fixed": "938ec030e90c5e53f1faac6fab1643f14e4f4a79"
            },
            {
              "fixed": "d3ca26983dfbccdf609f24ff5877dc3118e4702d"
            }
          ],
          "repo": "https://github.com/python/cpython",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "PSF",
    "cwe_ids": [
      "CWE-121"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/9xxx/CVE-2026-9669.json"
  },
  "details": "bz2.BZ2Decompressor objects could be reused after a decompression error. If an application caught the resulting OSError and retried with the same decompressor, crafted input could cause the decompressor to resume from an invalid internal state and perform out-of-bounds writes to a stack buffer. This could crash the process when processing untrusted data.",
  "id": "CVE-2026-9669",
  "modified": "2026-07-09T03:51:16.710076596Z",
  "published": "2026-06-08T22:01:15.420Z",
  "references": [
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/06/08/17"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/9xxx/CVE-2026-9669.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://mail.python.org/archives/list/security-announce@python.org/thread/DBJZETMGUIFK7DVUWMOXHD3Z6IX2QPSX/"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-9669"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/python/cpython/issues/150599"
    },
    {
      "type": "FIX",
      "url": "https://github.com/python/cpython/commit/157a5df8cb5d82b33f918a7489e72ce95ceb12b6"
    },
    {
      "type": "FIX",
      "url": "https://github.com/python/cpython/commit/5755d0f083949ff3c5bf3a37e673e24e306b036e"
    },
    {
      "type": "FIX",
      "url": "https://github.com/python/cpython/commit/619a12b2e545391dc436b3af79dda22337382a6f"
    },
    {
      "type": "FIX",
      "url": "https://github.com/python/cpython/commit/938ec030e90c5e53f1faac6fab1643f14e4f4a79"
    },
    {
      "type": "FIX",
      "url": "https://github.com/python/cpython/commit/d3ca26983dfbccdf609f24ff5877dc3118e4702d"
    },
    {
      "type": "FIX",
      "url": "https://github.com/python/cpython/pull/150600"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/python/cpython"
    }
  ],
  "schema_version": "1.7.5",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "bz2.BZ2Decompressor reuse after error can cause a stack buffer overflow"
}