CVE-2026-112908

5.3 MEDIUM 0.1% exploit odds Fix listed Other Library

What it is

filelock is a platform-independent file lock for Python. From version 3.30.0 until version 4.2.1, StrictSoftFileLock and AsyncStrictSoftFileLock on POSIX systems create coordination and claim directories without applying the caller’s restrictive lock mode. A permissive umask or inherited default ACL can leave these directories writable by another local user, allowing that user to delete an active holder’s claims. Another authorized process can then acquire the lock while the original holder remains in its critical section. An attacker can also plant malformed claims to prevent acquisition. This issue is fixed in version 4.2.1.

At a glance

Exploitability: Can be exploited locally on the machine with a low-privilege account. High risk of data tampering.
Exploit odds: 0.1% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2026-10-19 20:16 UTC ReservedThe CVE id was reserved by its CNA
2026-11-05 22:17 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-11-06 21:40 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 0.1% in the next 30 days (EPSS).
Severity: 5.3 MEDIUM (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2026-11-05 22:17 UTC
Last modified: 2026-11-06 21:40 UTC
Exploit probability: 0.1% · EPSS, next 30 days
Weakness: CWE-732 · Incorrect permission assignment
Record status: Awaiting Analysis

Attack profile CVSS 3.1 · 5.3

Attack vector: Local
Complexity: High
Privileges needed: Low
User interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: High
Availability: Low

Raw vector

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:L

Is it in your code?

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Fix and advisories

References

NVD record · CVE.org record