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Vulnerability record · CVE-2026-9669 · published 8 June 2026

CVE-2026-9669: Stack-based buffer overflow 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 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.

8.2 CVSS 4.0 High EPSS 0.61% · top 53.1% CWE-121 · Stack-based buffer overflow Awaiting Analysis
8.2CVSS 4.0 base score
0.61%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
11References
13 Aug 2026Last modified by NVD

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.

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://github.com/python/cpython/commit/157a5df8cb5d82b33f918a7489e72ce95ceb12b6
https://github.com/python/cpython/commit/1ba6135eae75ad8413413caeeedb56ae72320636
https://github.com/python/cpython/commit/5755d0f083949ff3c5bf3a37e673e24e306b036e
https://github.com/python/cpython/commit/619a12b2e545391dc436b3af79dda22337382a6f
https://github.com/python/cpython/commit/938ec030e90c5e53f1faac6fab1643f14e4f4a79
https://github.com/python/cpython/commit/991e6cf86496718c4ef00b362d640e00cb5c85b2
https://github.com/python/cpython/commit/d3ca26983dfbccdf609f24ff5877dc3118e4702d
https://github.com/python/cpython/issues/150599
https://github.com/python/cpython/pull/150600
https://mail.python.org/archives/list/[email protected]/thread/DBJZETMGUIFK7DVUWMOXHD3Z6IX2QPSX/
http://www.openwall.com/lists/oss-security/2026/06/08/17

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Source: NIST National Vulnerability Database (record CVE-2026-9669), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.