CVE-2026-12345CWE-59

CVE-2026-12345

published September 29, 2026

CVSS
5.9
EPSS
0%
Percentile
7.2
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS
5.9 · NONE
CVSS v4.0
5.9 · CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N
EPSS
0.00180 · 7.2th percentile
Weakness
CWE-59 · Improper Link Resolution Before File Access ('Link Following')
Published
2026-09-29T22:17Z
References (8)
https://github.com/python/cpython/commit/06ef3d43fdaf4da97af12fa694b4886092c4b970 · [email protected]https://github.com/python/cpython/commit/458e7134a5af7f86aee9d21b51cf499b41aa4420 · [email protected]https://github.com/python/cpython/commit/58ed0259cae509a19138795df302fe60b544dc74 · [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]https://github.com/python/cpython/pull/157580 · [email protected]http://www.openwall.com/lists/oss-security/2026/09/29/40 · af854a3a-2127-422b-91ae-364da2661108
EPSS history
Timeline
  • 01 OCT 03:44Z
    EPSS moved — → 0%
    epss
  • 29 SEP 17:46Z
    Race condition in tempfile.TemporaryDirectory cleanup allows deleting files outside the temporary directory
    cvelistv5