CVE-2026-112915
filelock ReadWriteLock: a crafted lock database makes every acquire stall or hang regardless of timeout
CVSS Score
5.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-400 |
| Vendor | tox-dev |
| Product | filelock |
| Published | Oct 20, 2026 |
| Last Updated | Oct 20, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
tox-dev / filelock
>= 3.20.4, < 4.2.1
References
github.com: https://github.com/tox-dev/filelock/security/advisories/GHSA-cwqr-hh33-gh44 github.com: https://github.com/tox-dev/filelock/pull/834 github.com: https://github.com/tox-dev/filelock/commit/5e3f2ec0c5fb17cb2635b60b2b68bc63ab81ca2d github.com: https://github.com/tox-dev/filelock/releases/tag/4.2.1