CVE-2026-12345Race condition in tempfile.TemporaryDirectory cleanup allows deleting files outside the temporary directory
Updated under an hour ago ()
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It affects Python Software Foundation CPython. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 5.9 MEDIUM (v4.0, CNA)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
- Weakness (CWE)
- CWE-59
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- PSF
- NVD analysis
- Awaiting Analysis
- Record last updated
- Oct 10, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Python Software Foundation CPython python_software_foundation:cpython (from the name) | before 3.12.15; from 3.15.0a1 before 3.15.0rc3 | CNA record |
References
- https://github.com/python/cpython/pull/157580patch
- https://github.com/python/cpython/issues/157579issue-tracking
- https://github.com/python/cpython/commit/5c20517a4fc56683efe63a7751020db9573f538dpatch
- https://github.com/python/cpython/commit/458e7134a5af7f86aee9d21b51cf499b41aa4420patch
- https://github.com/python/cpython/commit/e1f3590f155c6d66007e958c98c9d69316551993patch
- https://github.com/python/cpython/commit/06ef3d43fdaf4da97af12fa694b4886092c4b970patch
- https://github.com/python/cpython/commit/58ed0259cae509a19138795df302fe60b544dc74patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.