CVE-2026-112909
filelock: UnixFileLock truncates and chmods any regular file another user renames or hard-links onto the lock path
CVSS Score
6.1
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-706 |
| Vendor | tox-dev |
| Product | filelock |
| Published | Oct 20, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
High
Availability
None
Affected Versions
tox-dev / filelock
< 4.2.1
References
github.com: https://github.com/tox-dev/filelock/security/advisories/GHSA-69hj-f68j-2879 github.com: https://github.com/tox-dev/filelock/pull/835 github.com: https://github.com/tox-dev/filelock/commit/e1e825b1992f69fb6b346dc395d5ae4893536c0a github.com: https://github.com/tox-dev/filelock/releases/tag/4.2.1