{"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":"2026-06-26T11:56:15.944083959Z","published":"2026-06-08T22:01:15.420Z","related":["CGA-w7r7-76wj-xg3r"],"database_specific":{"cna_assigner":"PSF","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/9xxx/CVE-2026-9669.json","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/5755d0f083949ff3c5bf3a37e673e24e306b036e"},{"type":"FIX","url":"https://github.com/python/cpython/commit/619a12b2e545391dc436b3af79dda22337382a6f"},{"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"},{"introduced":"ebf955df7a89ed0c7968f79faec1de49f61ed7cb"},{"introduced":"f31a89bb901067dd105b00cfa90523cf7ffdbbdd"},{"fixed":"fd17997c3866d61e0e7bd8201b1d8f35b40a40bd"},{"fixed":"c63aec69bd59c55314c06c23f4c22c03de76fe45"},{"fixed":"f1eb0c0b0cd6ad24f3126e1df093aeb5845d6a88"},{"fixed":"157a5df8cb5d82b33f918a7489e72ce95ceb12b6"},{"fixed":"5755d0f083949ff3c5bf3a37e673e24e306b036e"},{"fixed":"619a12b2e545391dc436b3af79dda22337382a6f"},{"fixed":"d3ca26983dfbccdf609f24ff5877dc3118e4702d"}],"database_specific":{"source":["AFFECTED_FIELD","REFERENCES"],"extracted_events":[{"introduced":"0"},{"fixed":"3.13.14"},{"introduced":"3.14.0"},{"fixed":"3.14.6"},{"introduced":"3.15.0a1"},{"fixed":"3.15.0b3"}]}}],"versions":["v3.15.0b2","v3.14.5","v3.15.0b1","v3.14.5rc1","v3.13.13","v3.14.4","v3.13.12","v3.14.3","v3.14.2","v3.13.11","v3.13.10","v3.14.1","v3.15.0a2","v3.15.0a1","v3.13.8","v3.14.0","v3.13.7","v3.13.6","v3.13.5","v3.13.4","v3.14.0b1","v3.13.3","v3.14.0a7","v3.14.0a6","v3.14.0a5","v3.13.2","v3.14.0a4","v3.14.0a3","v3.13.1","v3.14.0a2","v3.14.0a1","v3.13.0","v3.13.0rc3","v3.13.0rc2","v3.13.0rc1","v3.13.0b4","v3.13.0b3","v3.13.0b2","v3.13.0b1","v3.13.0a6","v3.13.0a5","v3.13.0a4","v3.13.0a3","v3.13.0a2","v3.13.0a1","v3.12.0b1","v3.12.0a7","v3.12.0a6","v3.12.0a5","v3.12.0a4","v3.12.0a3","v3.12.0a2","v3.12.0a1","v3.11.0b1","v3.11.0a7","v3.11.0a6","v3.11.0a5","v3.11.0a4","v3.11.0a3","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":"1.7.5","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"}]}