CVE-2026-112906

NameCVE-2026-112906
Descriptionfilelock is a platform-independent file lock for Python. From 4.1.0 until 4.2.1, SoftFileLock versions from 4.1.0 can reuse a stale observation when an attacker pre-dates and removes its own marker, at least two lock-user processes are waiting, coarse or matching modification times preserve the observation, and an honest contender creates a fresh marker on the reused inode, causing that live marker to be removed as stale. This issue is fixed in version 4.2.1.
SourceCVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs1151686

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
python-filelock (PTS)bookworm3.9.0-1+deb12u1vulnerable
trixie3.18.0-1+deb13u1vulnerable
forky, sid4.2.8-1fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
python-filelocksource(unstable)4.2.8-11151686

Notes

https://github.com/tox-dev/filelock/security/advisories/GHSA-2g95-wg33-c5x2
Fixed by: https://github.com/tox-dev/filelock/commit/740ff666b62a88496c8d7394e4e6230605e4d62b (4.2.1)

Search for package or bug name: Reporting problems