CVE-2026-15310CWE-400denial-of-service

CVE-2026-15310

published August 25, 2026

CVSS
2.1
EPSS
1%
Percentile
43.7
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS
2.1 · NONE
CVSS v4.0
2.1 · CVSS: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
0.00526 · 43.7th percentile
Weakness
CWE-400 · Uncontrolled Resource Consumption
Published
2026-08-25T19:16Z
References (13)
https://github.com/python/cpython/commit/09a2e7e6678b4f65449e7ad8f112c48f944591e2 · [email protected]https://github.com/python/cpython/commit/1b424c0178a01e155fd0267dc28a8fc1159b33a8 · [email protected]https://github.com/python/cpython/commit/31980e84b9a708424a0a1dfecde3fc991e313f89 · [email protected]https://github.com/python/cpython/commit/6257029de42ef89b67f3d20137de87d43e197530 · [email protected]https://github.com/python/cpython/commit/9d167992b59cf5e23c66b9ed742b13f5925f7d70 · [email protected]https://github.com/python/cpython/commit/c2bfbcdd1a11690507a10bc0998f95b8dc6b6fac · [email protected]https://github.com/python/cpython/commit/dcdd406ddbfc4cb29b24c3df17cbabe21d316ce1 · [email protected]https://github.com/python/cpython/commit/e2311cfb3dd518f008f312fe0631f4f7490d237a · [email protected]https://github.com/python/cpython/commit/f507e6946a3194e83e1d7b8ee6e14567175e46de · [email protected]https://github.com/python/cpython/commit/f897dbf2f36a5935700b7c2d94d4681d2136b7d4 · [email protected]https://github.com/python/cpython/issues/156002 · [email protected]https://github.com/python/cpython/pull/156003 · [email protected]https://mail.python.org/archives/list/[email protected]/thread/YUHXURX2WZGKGNA4ANYBQS2VZRYQ5JNK/ · [email protected]
EPSS history
Timeline
  • 27 AUG 06:18Z
    EPSS moved — → 0%
    epss
  • 25 AUG 15:07Z
    zipfile: bzip2/LZMA/Zstandard members decompress without a max_length bound, defeating chunked-read memory limits
    cvelistv5