CVE-2026-12345
Severity not reportedThe cleanup of tempfile.TemporaryDirectory is vulnerable to a race condition.
The cleanup of tempfile.TemporaryDirectory is vulnerable to a race condition. An attacker who can modify the tree during cleanup can replace a directory with a symbolic link, causing files outside of the temporary directory to be deleted or have their permissions and file flags reset, with the privileges of the process performing the cleanup. Note that platforms where shutil.rmtree.avoids_symlink_attacks is false, remain affected, and file flags may still be reset outside of the tree on all platforms.
Affected products
Not reported by the source (unknown — not "none").
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://github.com/python/cpython/commit/0478b52788117db4b831b3efd648f56b777628aa cna@python.org
- https://github.com/python/cpython/commit/06ef3d43fdaf4da97af12fa694b4886092c4b970 cna@python.org
- https://github.com/python/cpython/commit/458e7134a5af7f86aee9d21b51cf499b41aa4420 cna@python.org
- https://github.com/python/cpython/commit/58ed0259cae509a19138795df302fe60b544dc74 cna@python.org
- https://github.com/python/cpython/commit/5c20517a4fc56683efe63a7751020db9573f538d cna@python.org
- https://github.com/python/cpython/commit/c39b52d00b42200aaadff679e2fe3f1006d57c58 cna@python.org
- https://github.com/python/cpython/commit/e1f3590f155c6d66007e958c98c9d69316551993 cna@python.org
- https://github.com/python/cpython/issues/157579 cna@python.org
- https://github.com/python/cpython/pull/157580 cna@python.org
- http://www.openwall.com/lists/oss-security/2026/09/29/40 af854a3a-2127-422b-91ae-364da2661108