CVE-2026-112906

Q: How do I fix CVE-2026-112906?

Upgrade filelock to 4.2.1 or later.

Q: Is CVE-2026-112906 being actively exploited?

Not that we know of. CVE-2026-112906 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.17% is the estimated probability that it will be exploited in the next 30 days. That is higher than 6% of all scored CVEs.

Q: How severe is CVE-2026-112906?

CVE-2026-112906 has a CVSS v3 base score of 4.7, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

Q: What does CVE-2026-112906 affect?

Published advisories record a fix for filelock (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

MEDIUM

4.7

CVSS v3

NVD

Description

filelock is a platform-independent file lock for Python. From 4.1.0 until 4.2.1, SoftFileLock versions from 4.1.0 can reuse a stale observation when an attacker pre-dates and removes its own marker, at least two lock-user processes are waiting, coarse or matching modification times preserve the observation, and an honest contender creates a fresh marker on the reused inode, causing that live marker to be removed as stale. This issue is fixed in version 4.2.1.

CWE-694 CWE-362Race Condition

How to fix

Remediation Available

filelockNVD

Affected:>= 4.1.0, < 4.2.1Fixed in:4.2.1CVE-2026-112906derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityHigh

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityHigh

AvailabilityNone

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

Exploit Intelligence

0.17%probability of exploitation in 30 days

6thpercentile

Low risk: more likely to be exploited than 6% of all known CVEs.

References

Patch2

Release Notes1

github.com

Related Vulnerabilities

Other CWE-694 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2020-15187	Low	3.0	1.5%	-	Fix
CVE-2021-3436	Medium	4.3	1.0%	-	-
CVE-2020-15185	Low	2.2	0.9%	-	Fix
CVE-2023-20100	Medium	6.8	0.8%	-	-
CVE-2026-102634	High	7.5	0.6%	-	-
CVE-2026-63976	High	8.8	0.6%	-	Fix

Common questions

How do I fix CVE-2026-112906?

Upgrade filelock to 4.2.1 or later.

Is CVE-2026-112906 being actively exploited?

Not that we know of. CVE-2026-112906 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.17% is the estimated probability that it will be exploited in the next 30 days. That is higher than 6% of all scored CVEs.

How severe is CVE-2026-112906?

CVE-2026-112906 has a CVSS v3 base score of 4.7, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2026-112906 affect?

Published advisories record a fix for filelock (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

Embed a live status badge for CVE-2026-112906

Markdown

[![CVE-2026-112906](https://tridentstack.com/cve/badge/CVE-2026-112906.svg)](https://tridentstack.com/cve/CVE-2026-112906)

HTML

<a href="https://tridentstack.com/cve/CVE-2026-112906"><img src="https://tridentstack.com/cve/badge/CVE-2026-112906.svg" alt="CVE-2026-112906"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Run a free CVE scan on your fleet Start freeThis CVE lookup is free and always will be.

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-10-27.