CVE-2026-15310

When decompressing crafted zip files using the bzip/LZMA/Zstandard compressions, Python could use an attacker-controlled size to pre-allocate memory, possibly resulting in memory exhaustion.

CVSS 4.0

2.1CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

EPSS

0.5% chance of exploitation in the next 30 days; higher than 44% of CVEs (scores of 2026-10-25)

CWE

CWE-400

Published

2026-08-25

Modified

2026-10-02

Record from

the NVD, synced 2026-10-19

References

• https://github.com/python/cpython/commit/09a2e7e6678b4f65449e7ad8f112c48f944591e2
• https://github.com/python/cpython/commit/1b424c0178a01e155fd0267dc28a8fc1159b33a8
• https://github.com/python/cpython/commit/31980e84b9a708424a0a1dfecde3fc991e313f89
• https://github.com/python/cpython/commit/6257029de42ef89b67f3d20137de87d43e197530
• https://github.com/python/cpython/commit/9d167992b59cf5e23c66b9ed742b13f5925f7d70

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