CVE-2026-12345

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.

References

https://github.com/redtheman/ssm-cve-patching

https://github.com/pixel365/govulncheckignore

https://github.com/HarmvanBergen/cve-tracker

https://github.com/Norras/CVE-DB

https://github.com/TolgaHanGunler/kernel-cve-runbook

https://github.com/Otyg/cveRisk

https://github.com/Diwahar555/CVE-Vulnerability-Tracker

https://github.com/eduolihez/kev-digest

https://github.com/jim-lahey69/snow-cve-risk-framework

https://github.com/logiover/cve-security-advisory-monitor

https://github.com/LacunaAporia/cve-correlation-engine

https://github.com/phaasma/cveinsight

https://github.com/sureshkumark03/Threat-Intelligence-Correlation-Engine

https://github.com/gcve-eu/gcve-eu-ai-extension

https://github.com/black-hak/feedmind

https://github.com/NullAILab/nullai-security-news

https://github.com/Hiroki-Tomimatsu/cve-monitor

https://github.com/x0x7b/ThreatFeed

https://github.com/cybernexuslabs-research/ThreatPulse

https://github.com/CPAN-Security/cna-tool

https://github.com/grokify/structured-changelog

https://github.com/joupify/soc-cert-guardian-extension

https://github.com/python/cpython/pull/157580

https://github.com/python/cpython/issues/157579

https://github.com/python/cpython/commit/e1f3590f155c6d66007e958c98c9d69316551993

https://github.com/python/cpython/commit/c39b52d00b42200aaadff679e2fe3f1006d57c58

https://github.com/python/cpython/commit/5c20517a4fc56683efe63a7751020db9573f538d

https://github.com/python/cpython/commit/58ed0259cae509a19138795df302fe60b544dc74

https://github.com/python/cpython/commit/458e7134a5af7f86aee9d21b51cf499b41aa4420

https://github.com/python/cpython/commit/06ef3d43fdaf4da97af12fa694b4886092c4b970

https://github.com/python/cpython/commit/0478b52788117db4b831b3efd648f56b777628aa

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-89183

http://www.openwall.com/lists/oss-security/2026/09/29/40

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3

CVSS v4

EPSS