filelock: ReadWriteLock follows a symlink at the lock path into SQLite

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-112936
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-20 15:17:16 UTC
Updated2026-10-20 19:50:26 UTC
Descriptionfilelock is a platform-independent file lock for Python. From 3.20.4 until 4.0.9, ReadWriteLock and AsyncReadWriteLock versions from 3.20.4 resolve the lock path and pass it to SQLite without rejecting a final symbolic link, allowing another local user who can create names in the lock directory to redirect database creation and locking or split mutual exclusion between targets. This issue is fixed in version 4.0.9.

Risk And Classification

Primary CVSS: v3.1 6.1 MEDIUM from [email protected]

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

Problem Types: CWE-59 | CWE-668 | CWE-59 CWE-59: Improper Link Resolution Before File Access ('Link Following') | CWE-668 CWE-668: Exposure of Resource to Wrong Sphere

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.1MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L
3.1CNADECLARED6.1MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
Low

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Tox-dev Filelock affected >= 3.20.4, < 4.0.9 Not specified

References

ReferenceSourceLinkTags
github.com/tox-dev/filelock/commit/4d45e83caf7e31f9a12fb44526bdc07f70114f04 [email protected] github.com
github.com/tox-dev/filelock/security/advisories/GHSA-j8f7-rjxc-mr56 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
github.com/tox-dev/filelock/releases/tag/4.0.9 [email protected] github.com
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