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  5. CVE-2026-22701

CVE-2026-22701: filelock Time-of-Check-Time-of-Use (TOCTOU) Symlink Vulnerability in SoftFileLock

January 13, 2026

Title: Time-of-Check-Time-of-Use (TOCTOU) Symlink Vulnerability in SoftFileLock

Affected Component: filelock package - SoftFileLock class File: src/filelock/_soft.py lines 17-27 CWE: CWE-362, CWE-367, CWE-59


References

  • github.com/advisories/GHSA-qmgc-5h2g-mvrw
  • github.com/tox-dev/filelock
  • github.com/tox-dev/filelock/commit/255ed068bc85d1ef406e50a135e1459170dd1bf0
  • github.com/tox-dev/filelock/commit/41b42dd2c72aecf7da83dbda5903b8087dddc4d5
  • github.com/tox-dev/filelock/security/advisories/GHSA-qmgc-5h2g-mvrw
  • nvd.nist.gov/vuln/detail/CVE-2026-22701

Code Behaviors & Features

Detect and mitigate CVE-2026-22701 with GitLab Dependency Scanning

Secure your software supply chain by verifying that all open source dependencies used in your projects contain no disclosed vulnerabilities. Dependency Scanning using SBOM also detects vulnerabilities from proprietary advisories that this site does not include. Learn more about Dependency Scanning using SBOM →

Affected versions

All versions before 3.20.3

Fixed versions

  • 3.20.3

Solution

Upgrade to version 3.20.3 or above.

Impact 5.3 MEDIUM

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:H

Learn more about CVSS

Weakness

  • CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
  • CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition
  • CWE-59: Improper Link Resolution Before File Access ('Link Following')

Source file

pypi/filelock/CVE-2026-22701.yml

Spotted a mistake? Edit the file on GitLab.

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