{"id":"CVE-2026-9669","summary":"bz2.BZ2Decompressor reuse after error can cause a stack buffer overflow","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.","aliases":["BIT-libpython-2026-9669","BIT-python-2026-9669","BIT-python-min-2026-9669","PSF-2026-27"],"modified":"2026-09-04T11:46:44.988258961Z","published":"2026-06-08T22:01:15.420Z","related":["openSUSE-SU-2026:11181-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/9xxx/CVE-2026-9669.json","cna_assigner":"PSF","cwe_ids":["CWE-121"]},"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/1ba6135eae75ad8413413caeeedb56ae72320636"},{"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/991e6cf86496718c4ef00b362d640e00cb5c85b2"},{"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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/python/cpython","events":[{"introduced":"0"},{"fixed":"3a19c2f0b3e91ce8f23d0cc64d4c9ee557823f24"},{"introduced":"deaf509e8fc6e0363bd6f26d52ad42f976ec42f2"},{"fixed":"41388c9cb160d0886d5ca00d2e6c8782608a4549"},{"introduced":"0fb18b02c8ad56299d6a2910be0bab8ad601ef24"},{"fixed":"2abcf904b8dac8c999d2b3aac76681abb333798a"},{"introduced":"60403a5409ff2c3f3b07dd2ca91a7a3e096839c7"},{"fixed":"fd17997c3866d61e0e7bd8201b1d8f35b40a40bd"},{"introduced":"ebf955df7a89ed0c7968f79faec1de49f61ed7cb"},{"fixed":"c63aec69bd59c55314c06c23f4c22c03de76fe45"},{"introduced":"f31a89bb901067dd105b00cfa90523cf7ffdbbdd"},{"fixed":"cf16a33fad15d1058ed71b92573d0bed57f85457"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"3.10.21"},{"introduced":"3.11.0"},{"fixed":"3.11.16"},{"introduced":"3.12.0"},{"fixed":"3.12.14"},{"introduced":"3.13.0"},{"fixed":"3.13.14"},{"introduced":"3.14.0"},{"fixed":"3.14.6"},{"introduced":"3.15.0a1"},{"fixed":"3.15.0b3"}],"source":"AFFECTED_FIELD"}}],"versions":["v3.15.0b2","v3.14.5","v3.15.0b1","v3.14.5rc1","v3.13.13","v3.14.4","v3.12.13","v3.10.20","v3.11.15","v3.13.12","v3.14.3","v3.14.2","v3.13.11","v3.13.10","v3.14.1","v3.13.8","v3.11.14","v3.10.19","v3.12.12","v3.14.0","v3.13.7","v3.13.6","v3.13.5","v3.13.4","v3.11.13","v3.10.18","v3.12.11","v3.13.3","v3.11.12","v3.12.10","v3.10.17","v3.13.2","v3.12.9","v3.13.1","v3.12.8","v3.10.16","v3.11.11","v3.13.0","v3.12.7","v3.11.10","v3.10.15","v3.12.6","v3.12.5","v3.12.4","v3.12.3","v3.11.9","v3.10.14","v3.12.2","v3.11.8","v3.12.1","v3.11.7","v3.11.6","v3.12.0","v3.11.5","v3.10.13","v3.11.4","v3.10.12","v3.10.11","v3.11.3","v3.10.10","v3.11.2","v3.10.9","v3.11.1","v3.11.0rc2","v3.10.8","v3.10.7","v3.11.0rc1","v3.10.6","v3.11.0b5","v3.11.0b4","v3.10.5","v3.11.0b3","v3.11.0b2","v3.11.0b1","v3.11.0a7","v3.10.4","v3.10.3","v3.11.0a6","v3.11.0a5","v3.11.0a4","v3.10.2","v3.11.0a3","v3.10.1","v3.10.0rc2","v3.10.0rc1","v3.10.0b4","v3.10.0b3","v3.10.0b2","v3.10.0b1","v3.10.0a7","v3.10.0a1","v3.9.0a2","v3.7.0a2","v3.6.0b1","v3.6.0a3","v3.5.0b1","v3.5.0a4","v3.5.0a3","v3.5.0a2","v3.5.0a1","v3.4.0b3","v3.4.0b2","v3.4.0b1","v3.4.0a4","v3.4.0a3","v3.4.0a2","v3.4.0a1","v3.3.0rc3","v3.3.0rc2","v3.3.0rc1","v3.3.0b2","v3.3.0b1","v3.3.0a4","v3.3.0a3","v3.3.0a2","v3.2rc3","v3.2rc2","v3.2rc1","v3.2b2","v3.2b1","v3.2a4","v3.2a3","v3.2a2","v3.2a1","v3.1","v3.1rc2","v3.1rc1","v3.1b1","v3.1a2","v3.1a1","v3.0rc3","v3.0rc2","v3.0rc1","v3.0b3","v3.0b2","v3.0b1","v3.0a5","v3.0a4","v3.0a3","v3.0a2","v3.0a1","v2.4","v2.4c1","v2.4b2","v2.4b1","v2.4a3","v2.4a2","v2.4a1","v2.3c2","v2.3c1","v2.2a3","v2.1","v2.1c2","v2.1c1","v2.1b2","v2.1b1","v2.1a2","v2.1a1","v2.0","v2.0c1","v2.0b2","v2.0b1","v1.6a2","v1.6a1","v1.5.2","v1.5.2c1","v1.5.2b2","v1.5.2b1","v1.5.2a2","v1.5.2a1","v1.5.1","v1.5","v1.5b2","v1.5b1","v1.5a4","v1.5a3","v1.5a2","v1.5a1","v1.4","v1.4b3","v1.4b2","v1.4b1","v1.3","v1.3b1","v1.2","v1.2b4","v1.2b3","v1.2b2","v1.2b1","v1.1.1","v1.1","v1.0.2","v1.0.1","v0.9.9","v0.9.8"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-9669.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","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"}]}