CVE-2026-9669

Published: Jun 8, 2026Modified: Jul 23, 2026

8.2

Vector

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:X/V:X/RE:X/U:X

Show more

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:X/V:X/RE:X/U:XShow less

Source: CNA (Secondary)

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 CWEs

Stack-based Buffer Overflow

A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).

References (9)

https://github.com/python/cpython/commit/157a5df8cb5d82b33f918a7489e72ce95ceb12b6

Source: cna@python.org

https://github.com/python/cpython/commit/5755d0f083949ff3c5bf3a37e673e24e306b036e

Source: cna@python.org

https://github.com/python/cpython/commit/619a12b2e545391dc436b3af79dda22337382a6f

Source: cna@python.org

https://github.com/python/cpython/commit/938ec030e90c5e53f1faac6fab1643f14e4f4a79

Source: cna@python.org

https://github.com/python/cpython/commit/d3ca26983dfbccdf609f24ff5877dc3118e4702d

Source: cna@python.org

https://github.com/python/cpython/issues/150599

Source: cna@python.org

https://github.com/python/cpython/pull/150600

Source: cna@python.org

https://mail.python.org/archives/list/security-announce@python.org/thread/DBJZETMGUIFK7DVUWMOXHD3Z6IX2QPSX/

Source: cna@python.org

http://www.openwall.com/lists/oss-security/2026/06/08/17

Source: af854a3a-2127-422b-91ae-364da2661108

Timeline

No history available yet.