zipfile: bzip2/LZMA/Zstandard members decompress without a max_length bound, defeating chunked-read memory limits
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.
01
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-15310US | — | — | ||
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 memo… | ||||
02
references
External citations — patches, advisories, analysis.
- https://github.com/python/cpython/commit/09a2e7e6678b4f65449e7ad8f112c48f944591e2WEB
- https://github.com/python/cpython/commit/1b424c0178a01e155fd0267dc28a8fc1159b33a8WEB
- https://github.com/python/cpython/commit/31980e84b9a708424a0a1dfecde3fc991e313f89WEB
- https://github.com/python/cpython/commit/6257029de42ef89b67f3d20137de87d43e197530WEB
- https://github.com/python/cpython/commit/9d167992b59cf5e23c66b9ed742b13f5925f7d70WEB
- https://github.com/python/cpython/commit/c2bfbcdd1a11690507a10bc0998f95b8dc6b6facWEB
- https://github.com/python/cpython/commit/dcdd406ddbfc4cb29b24c3df17cbabe21d316ce1WEB
- https://github.com/python/cpython/commit/e2311cfb3dd518f008f312fe0631f4f7490d237aWEB
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