medium5.5
CVE-2026-112915
filelock ReadWriteLock: a crafted lock database makes every acquire stall or hang regardless of timeout
Impact
filelock is a platform-independent file lock for Python. From 3.20.4 until 4.2.1, ReadWriteLock can open a crafted SQLite lock database without bounding schema and query work, allowing another local user who can replace the database to make acquisition stall or hang; versions from 3.20.4 expose this on initial per-instance opening, and versions from 3.30.0 repeat the exposure on every acquisition. This issue is fixed in version 4.2.1.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | filelock | >= 3.20.4, <= 4.2.0 | 4.2.1 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Tox-Dev | Filelock | from 3.20.4 before 4.2.1 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-cwqr-hh33-gh44
- https://github.com/tox-dev/filelock/security/advisories/GHSA-cwqr-hh33-gh44
- https://nvd.nist.gov/vuln/detail/CVE-2026-112915
- https://github.com/tox-dev/filelock/pull/834
- https://github.com/tox-dev/filelock/commit/5e3f2ec0c5fb17cb2635b60b2b68bc63ab81ca2d
- https://github.com/tox-dev/filelock/releases/tag/4.2.1