CVE-2026-112940 filelock - Race Condition

filelock 3.20.4 to 4.2.1 contains a race condition caused by SQLite database and side file reopening by name on POSIX systems, letting attackers with rename access overwrite or unlink files, exploit requires writable adjacent hot journal.

CVSS base score 7.1 /10
High
CISA KEV
Not listed
Public exploit
None known
View the NVD record ↗

Details

Type
Race Condition
Impact
Data Tampering, Denial Of Service
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Published
20 October 2026
Updated
21 October 2026
Weakness
CWE-363

Vendor fix

Update to version 4.2.1 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

← All CVEs