CVE-2026-112907: tox-dev filelock · Improper Locking
Affects tox-dev filelockSource CVE Database V5
Not known to be exploited · CVSS 2.5 Low : upgrade to 4.2.1 when convenient.
Data as of 5 Nov 2026, 22:33 UTC
Thin evidence
One scorer or none| CNA (GitHub_M) | CVSS 3.1 | 2.5 |
|---|
- Patch
- Available – fixed in 4.2.1
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:LExploitation evidence
Disclosed: evidence found.
CVE published 5 Nov 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 5 Nov 2026.
What to do
Upgrade tox-dev filelock to 4.2.1.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| tox-devfilelock | Affected
| Fixed in
|
AI-suggested
Upgrade to tox-dev filelock version 4.2.1 or later, where this issue is fixed. No other mitigation is necessary as the vulnerability is resolved in the fixed release.
Description
CVE-2026-112907 is a low-severity vulnerability in the tox-dev filelock Python library affecting versions from 3.22.0 up to but not including 4.2.1. It involves improper locking behavior on Windows where a local user with read access to an unheld lock marker can cause certain soft lock operations to wait indefinitely beyond their timeout, effectively causing a denial of service. The issue does not compromise data confidentiality or integrity and does not allow access to files other than the lock marker. This flaw is fixed in version 4.2.1.
References
- github.com/tox-dev/filelock/security/advisories/GHSA-567q-5qvw-pf92 (opens in a new tab)
- github.com/tox-dev/filelock/pull/835 (opens in a new tab)
- github.com/tox-dev/filelock/commit/97d694a9a3ee1721d6c79a480174dfd9b060a080 (opens in a new tab)
- github.com/tox-dev/filelock/commit/e1e825b1992f69fb6b346dc395d5ae4893536c0a (opens in a new tab)
- github.com/tox-dev/filelock/releases/tag/4.2.1 (opens in a new tab)