CVE-2026-112911

Q: How do I fix CVE-2026-112911?

Upgrade filelock to 4.2.1 or later.

Q: Is CVE-2026-112911 being actively exploited?

Not that we know of. CVE-2026-112911 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.15% is the estimated probability that it will be exploited in the next 30 days. That is higher than 4% of all scored CVEs.

Q: How severe is CVE-2026-112911?

CVE-2026-112911 has a CVSS v3 base score of 6.3, 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-2026-112911 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

6.3

CVSS v3

NVD

Description

filelock is a platform-independent file lock for Python. From 3.30.0 until 4.2.1, StrictSoftFileLock versions from 3.30.0 and SoftReadWriteLock versions from 4.0.0 can adopt a protocol directory created first by another local user in a shared parent directory, allowing that user to alter protocol state and admit concurrent holders. This issue is fixed in version 4.2.1.

CWE-283

How to fix

Remediation Available

filelockNVD

Affected:>= 3.30.0, < 4.2.1Fixed in:4.2.1CVE-2026-112911derived 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

AvailabilityHigh

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

Exploit Intelligence

0.15%probability of exploitation in 30 days

4thpercentile

Low risk: more likely to be exploited than 4% of all known CVEs.

References

Patch3

Release Notes1

github.com

Related Vulnerabilities

Other CWE-283 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-27903	Critical	9.8	8.9%	-	Fix
CVE-2020-8554	Medium	6.3	8.7%	-	Fix
CVE-2021-24501	High	8.1	1.3%	-	Fix
CVE-2021-24500	High	8.1	0.6%	-	Fix
CVE-2025-1007	Medium	5.3	0.5%	-	Fix
CVE-2022-29220	Medium	6.5	0.5%	-	Fix

Common questions

How do I fix CVE-2026-112911?

Upgrade filelock to 4.2.1 or later.

Is CVE-2026-112911 being actively exploited?

Not that we know of. CVE-2026-112911 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.15% is the estimated probability that it will be exploited in the next 30 days. That is higher than 4% of all scored CVEs.

How severe is CVE-2026-112911?

CVE-2026-112911 has a CVSS v3 base score of 6.3, 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-2026-112911 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.

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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 2026-10-28.