CVE-2026-15310

UNKNOWN 0.0

zipfile: bzip2/LZMA/Zstandard members decompress without a max_length bound, defeating chunked-read memory limits

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-400
Vendor	python software foundation
Product	cpython
Published	Aug 25, 2026

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Affected Versions

Python Software Foundation / CPython

0 < 3.16.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/python/cpython/pull/156003 github.com: https://github.com/python/cpython/issues/156002 mail.python.org: https://mail.python.org/archives/list/[email protected]/thread/YUHXURX2WZGKGNA4ANYBQS2VZRYQ5JNK/

Credits

🔍 tonghuaroot (童话) (https://github.com/tonghuaroot) Petr Viktorin (https://github.com/encukou) William Woodruff (https://github.com/woodruffw)