Skip to content
fr Sign in
8.2 High

CVE-2026-9669 bz2.BZ2Decompressor objects could be reused after a decompression error

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.

Affected products and versions

Product Affected versions Fixed in
CPython 3.15 3.15.0a1 → < 3.15.0b3 3.15.0b3
CPython 3.14 3.14.0 → < 3.14.6 3.14.6
CPython 3.13 3.13.0 → < 3.13.14 3.13.14
CPython 3.12 3.12.0 → < 3.12.14 3.12.14
CPython 3.11 3.11.0 → < 3.11.16 3.11.16
CPython 3.10 earliest → < 3.10.21 3.10.21

References

Timeline

  1. Published
  2. Last modified

Other CVEs of CPython

The 79 CVEs of CPython →
CVE-2026-116566 socket.getaddrinfo() previously accepted null bytes within *host* and *port* parameters which can cause the values to be… 5.3 Medium CVE-2026-103995 Lenient parsing of integers for response body and chunk framing 2.0 Low CVE-2026-115557 Python has added a denylist for known compromised certificates to the "ssl" module to ensure user safety even without… 9.4 Critical CVE-2026-114583 tarfile.tar_filter could be bypassed using crafted link entries, including symlinks with empty or directory-like… 6.9 Medium
Track this CVE