CVE-2026-15310

Summary

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.

Affected Software

Weaknesses

• CWE-400: CWE-400

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: partial

References

• https://github.com/python/cpython/pull/156003
• https://github.com/python/cpython/issues/156002
• https://mail.python.org/archives/list/security-announce@python.org/thread/YUHXURX2WZGKGNA4ANYBQS2VZRYQ5JNK/
• https://github.com/python/cpython/commit/f897dbf2f36a5935700b7c2d94d4681d2136b7d4
• https://github.com/python/cpython/commit/1b424c0178a01e155fd0267dc28a8fc1159b33a8
• https://github.com/python/cpython/commit/31980e84b9a708424a0a1dfecde3fc991e313f89
• https://github.com/python/cpython/commit/e2311cfb3dd518f008f312fe0631f4f7490d237a
• https://github.com/python/cpython/commit/f507e6946a3194e83e1d7b8ee6e14567175e46de
• https://github.com/python/cpython/commit/9d167992b59cf5e23c66b9ed742b13f5925f7d70
• https://github.com/python/cpython/commit/dcdd406ddbfc4cb29b24c3df17cbabe21d316ce1
• https://github.com/python/cpython/commit/09a2e7e6678b4f65449e7ad8f112c48f944591e2
• https://github.com/python/cpython/commit/6257029de42ef89b67f3d20137de87d43e197530
• https://github.com/python/cpython/commit/c2bfbcdd1a11690507a10bc0998f95b8dc6b6fac

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