Vulnerability Description
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.
Related Weaknesses (CWE)
References
- https://github.com/python/cpython/commit/157a5df8cb5d82b33f918a7489e72ce95ceb12b
- https://github.com/python/cpython/commit/1ba6135eae75ad8413413caeeedb56ae7232063
- https://github.com/python/cpython/commit/5755d0f083949ff3c5bf3a37e673e24e306b036
- https://github.com/python/cpython/commit/619a12b2e545391dc436b3af79dda22337382a6
- https://github.com/python/cpython/commit/938ec030e90c5e53f1faac6fab1643f14e4f4a7
- https://github.com/python/cpython/commit/991e6cf86496718c4ef00b362d640e00cb5c85b
- https://github.com/python/cpython/commit/d3ca26983dfbccdf609f24ff5877dc3118e4702
- https://github.com/python/cpython/issues/150599
- https://github.com/python/cpython/pull/150600
- https://mail.python.org/archives/list/[email protected]/thread/DBJZET
- http://www.openwall.com/lists/oss-security/2026/06/08/17
FAQ
What is CVE-2026-9669?
CVE-2026-9669 is a documented vulnerability. 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 decompress...
How severe is CVE-2026-9669?
CVSS scoring is not yet available for CVE-2026-9669. Check NVD for updates.
Is there a patch for CVE-2026-9669?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.