CVE-2026-112912
lowfilelock is a platform-independent file lock for Python.
Vendor / product: Tox-dev — filelock
filelock is a platform-independent file lock for Python. From 3.32.6 until 4.2.1, SoftFileLock can follow a swapped symbolic link during the conditional os.access writability check for a node without its owner-write bit, allowing another local user on a platform and directory configuration that follows the link to infer whether a chosen path exists and is writable from the observable acquisition result. This issue is fixed in version 4.2.1.
CVSS
2.5
2.5 (CVSS v3.1)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N Severity source: NVD CVSS v3.1 (security-advisories@github.com)
Timeline (UTC)
Published: 2026-10-20 15:17
Modified: 2026-10-21 21:18
NVD status: Analyzed
Last synced 1 day ago
Verified against the source API 2026-10-27 07:04 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).
Affected products
tox-dev / filelock ≥3.32.6 <4.2.1
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
Patch / mitigation: https://github.com/tox-dev/filelock/commit/e1e825b1992f69fb6b346dc395d5ae4893536c0a
Patch / mitigation: https://github.com/tox-dev/filelock/pull/835
Patch / mitigation: https://github.com/tox-dev/filelock/security/advisories/GHSA-9j6q-wvj5-jgjg
Patch / mitigation: https://github.com/tox-dev/filelock/security/advisories/GHSA-9j6q-wvj5-jgjg
References
- https://github.com/tox-dev/filelock/commit/e1e825b1992f69fb6b346dc395d5ae4893536c0a security-advisories@github.com
- https://github.com/tox-dev/filelock/pull/835 security-advisories@github.com
- https://github.com/tox-dev/filelock/releases/tag/4.2.1 security-advisories@github.com
- https://github.com/tox-dev/filelock/security/advisories/GHSA-9j6q-wvj5-jgjg security-advisories@github.com
- https://github.com/tox-dev/filelock/security/advisories/GHSA-9j6q-wvj5-jgjg 134c704f-9b21-4f2e-91b3-4a467353bcc0
Data sources
NVD CVE API 2.0 — fetched 2026-10-27 07:04 UTC · record ↗