CVE catalog
CVE-2026-112935
python-filelock: CVE-2026-112935
- Severity
- Medium · CVSS 4.7
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.13% · Oct 25, 2026
filelock is a platform-independent file lock for Python. From 3.22.0 until 4.2.1, SoftFileLock can break a stale marker after an attacker frees its own marker following the stale read, an honest contender creates a live successor on the reused inode, and the successor's modification time is not newer than the saved observation, causing the live marker to be removed and two holders to be admitted. 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 |
| Cpe | filelock | Not reported | 4.2.1 | fixed |
| 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 |
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-2026-112935 | 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://nvd.nist.gov/vuln/detail/CVE-2026-112935]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-112935]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2026-112935]
- [https://security-tracker.debian.org/tracker/CVE-2026-112935]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-112935.json]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]