CVE catalog
CVE-2026-112909
python-filelock: CVE-2026-112909
- Severity
- Medium · CVSS 6.1
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.21% · Oct 25, 2026
filelock is a platform-independent file lock for Python. Prior to 4.2.1, UnixFileLock can truncate a regular file renamed onto the lock path when another local user has actual rename permission, or hard-linked there under a permissive hard-link policy; when an explicit mode is requested, affected versions from 3.10.2 can also change that file's mode. This issue is fixed in version 4.2.1.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | python-filelock | sid | 4.1.1-1 | vulnerable |
| Debian | python-filelock | forky | 4.1.1-1 | vulnerable |
| Debian | python-filelock | trixie | 3.18.0-1+deb13u1 | vulnerable |
| Debian | python-filelock | bookworm | 3.9.0-1+deb12u1 | vulnerable |
| Ubuntu | python-filelock | pro | 3.12.2-1 | vulnerable |
| Ubuntu | python-filelock | pro | 3.12.4-1 | vulnerable |
| Ubuntu | python-filelock | pro | 3.13.1-1 | vulnerable |
| Ubuntu | python-filelock | pro | 3.13.1-1ubuntu0.1~esm1 | vulnerable |
| Ubuntu | python-filelock | 26.10 | 3.20.3-1 | vulnerable |
| Ubuntu | python-filelock | 26.10 | 3.29.4-1 | vulnerable |
| Ubuntu | python-filelock | 26.10 | 3.32.0-1 | vulnerable |
| Ubuntu | python-filelock | 26.10 | 3.32.2-1 | vulnerable |
| Ubuntu | python-filelock | 26.04 | 3.18.0-1 | vulnerable |
| Ubuntu | python-filelock | 26.04 | 3.20.0-1 | vulnerable |
| Ubuntu | python-filelock | 26.04 | 3.20.2-1 | vulnerable |
| Ubuntu | python-filelock | 26.04 | 3.20.3-1 | vulnerable |
| Cpe | filelock | Not reported | 4.2.1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | python-filelock | source | sid | (unfixed) | not yet assigned | Not reported | [1151686] |
| Debian | python-filelock | source | forky | (unfixed) | not yet assigned | Not reported | [1151686] |
| Debian | python-filelock | source | trixie | (unfixed) | not yet assigned | Not reported | [1151686] |
| Debian | python-filelock | source | bookworm | (unfixed) | not yet assigned | Not reported | [1151686] |
| Cpe | filelock | cpe | Not reported | 4.2.1 | Not reported | NVD-CVE-2026-112909 | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [python3-filelock]Affected
Source package: [python-filelock]
Details (2)
3.9.0-1+deb12u1· all · bookwormAffected
dsa · python-filelock · debian · bookworm; dsa · python-filelock · debian · 12
3.9.0-1+deb12u1· all · bookwormAffected
dsa · python-filelock · debian · bookworm; dsa · python-filelock · debian · 12
[Debian 13 (Trixie)]
- [python3-filelock]Affected
Source package: [python-filelock]
Details (2)
3.18.0-1+deb13u1· all · trixieAffected
dsa · python-filelock · debian · 13
3.18.0-1+deb13u1· all · trixieAffected
dsa · python-filelock · debian · 13
Observed:
References
- [https://github.com/tox-dev/filelock/commit/e1e825b1992f69fb6b346dc395d5ae4893536c0a]
- [https://github.com/tox-dev/filelock/pull/835]
- [https://github.com/tox-dev/filelock/releases/tag/4.2.1]
- [https://github.com/tox-dev/filelock/security/advisories/GHSA-69hj-f68j-2879]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-112909]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-112909]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2026-112909]
- [https://security-tracker.debian.org/tracker/CVE-2026-112909]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-112909.json]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]