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VULNERABILITIES

CVE-2026-12345 Details

Description

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.

Metrics

CVSS 3.x Severity and Vector Strings:

No CVSS 3.x data is available for this CVE.

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
http://www.openwall.com/lists/oss-security/2026/09/29/40 CVE
https://github.com/python/cpython/commit/458e7134a5af7f86aee9d21b51cf499b41aa4420 [email protected]
https://github.com/python/cpython/commit/5c20517a4fc56683efe63a7751020db9573f538d [email protected]
https://github.com/python/cpython/commit/e1f3590f155c6d66007e958c98c9d69316551993 [email protected]
https://github.com/python/cpython/issues/157579 [email protected]

see all 6 references

Weakness Enumeration

CWE-IDCWE NameSource
CWE-59Improper Link Resolution Before File Access ('Link Following')CISA-ADP

Affected Products

No affected product data is available for this CVE.

Change History

5 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-12345
NVD Published Date:
Sep 29, 2026
NVD Last Modified:
Sep 30, 2026
Source:
[email protected]
CVE-2026-12345 Details - Not Deferred