Resource exhaustion in Python Software Foundation Cpython

CVE-2026-15310

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.

Vulnerability class: DoS (Denial of Service)

Affected products

Python Software Foundation Cpython

Weakness classification (CWE)

CWE-400 — Uncontrolled Resource Consumption

References

cna@python.org (issue-tracking)
cna@python.org (patch)
cna@python.org (vendor-advisory)
github.com/python/cpython/commit/f897dbf2f36a5935700b7c2d94d4681d2136b7d4 (patch)