zipfile: bzip2/LZMA/Zstandard members decompress without a max_length bound, defeating chunked-read memory limits
8Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 2.1epss 0.4%
exploitation probability
0.4%top 66% of all CVEs
observed exploitation
nono source reports it
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/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Affected products
Python Software Foundation · CPythonReferences
https://github.com/python/cpython/commit/1b424c0178a01e155fd0267dc28a8fc1159b33a8https://github.com/python/cpython/commit/31980e84b9a708424a0a1dfecde3fc991e313f89https://github.com/python/cpython/commit/9d167992b59cf5e23c66b9ed742b13f5925f7d70https://github.com/python/cpython/commit/e2311cfb3dd518f008f312fe0631f4f7490d237ahttps://github.com/python/cpython/commit/f507e6946a3194e83e1d7b8ee6e14567175e46dehttps://github.com/python/cpython/commit/f897dbf2f36a5935700b7c2d94d4681d2136b7d4https://github.com/python/cpython/issues/156002https://github.com/python/cpython/pull/156003https://mail.python.org/archives/list/security-announce@python.org/thread/YUHXURX2WZGKGNA4ANYBQS2VZRYQ5JNK/