UBUNTU-CVE-2026-112908
Dashboard / Vulnerabilities / UBUNTU-CVE-2026-112908
Summary:
Details: filelock is a platform-independent file lock for Python. From version 3.30.0 until version 4.2.1, StrictSoftFileLock and AsyncStrictSoftFileLock on POSIX systems create coordination and claim directories without applying the caller’s restrictive lock mode. A permissive umask or inherited default ACL can leave these directories writable by another local user, allowing that user to delete an active holder’s claims. Another authorized process can then acquire the lock while the original holder remains in its critical section. An attacker can also plant malformed claims to prevent acquisition. This issue is fixed in version 4.2.1.
References: https://ubuntu.com/security/CVE-2026-112908, https://www.cve.org/CVERecord?id=CVE-2026-112908, https://github.com/tox-dev/filelock/pull/839, https://github.com/tox-dev/filelock/commit/8cf51802158b9cf7e1fc560c2da30491a662cfde, https://github.com/tox-dev/filelock/commit/bfa066d65a1ba9106f86ee9d027f7588b9c77e03, https://github.com/tox-dev/filelock/releases/tag/4.2.1, https://github.com/tox-dev/filelock/security/advisories/GHSA-6627-m3xw-93mp
Affected packages
Package
Name: python-filelock
Purl: pkg:deb/ubuntu/python-filelock?arch=source&distro=esm-apps%2Fbionic
Affected ranges
Type: ECOSYSTEM
Events:
