CVE-2026-112936: filelock is a platform-independent file lock for Python

Q: How do I fix CVE-2026-112936?

filelock: upgrade to 4.0.9. Exact commands for each OS are on this page.

Q: Is CVE-2026-112936 being exploited?

CVE-2026-112936 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-112936 affect?

CVE-2026-112936 affects filelock. Severity is medium (CVSS 6.1). filelock is a platform-independent file lock for Python. From 3.20.4 until 4.0.9, ReadWriteLock and AsyncReadWriteLock versions from 3.20.4 resolve the lock path and pass it to SQLite without rejecting a final symbolic link, allowing anothe

Q: How urgent is CVE-2026-112936?

Priority 30/100. Public exploit reference

Routine

MEDIUM 6.1UPGRADE

CVE-2026-112936 is a medium-severity flaw (CVSS 6.1) affecting filelock. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

filelock is a platform-independent file lock for Python. From 3.20.4 until 4.0.9, ReadWriteLock and AsyncReadWriteLock versions from 3.20.4 resolve the lock path and pass it to SQLite without rejecting a final symbolic link, allowing another local user who can create names in the lock directory to redirect database creation and locking or split mutual exclusion between targets. This issue is fixed in version 4.0.9.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 86%)
CISA exploited list	No
Weakness	CWE-59, CWE-668
Published	2026-10-20
Last modified	2026-10-21

Publisher (CNA): GitHub, Inc. · Vendor: tox-dev

Last updated 2026-10-21 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-10-20 15:17 UTCPublished CVE record published
2026-10-21 18:09 UTCUpdated Record last modified

tox-dev filelock UPGRADE

Affected: >= 3.20.4 and < 4.0.9

Fixed in: 4.0.9

Safe to downgrade to: a release before 3.20.4

1. Check installed version

pip show filelock

2. UPGRADE to 4.0.9

pip install --upgrade "filelock>=4.0.9"

3. If no update is available yet, DOWNGRADE to a release before 3.20.4

pip index versions filelock pip install "filelock<3.20.4"

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-112936?

filelock: upgrade to 4.0.9. Exact commands for each OS are on this page.

Is CVE-2026-112936 being exploited?

CVE-2026-112936 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-112936 affect?

CVE-2026-112936 affects filelock. Severity is medium (CVSS 6.1). filelock is a platform-independent file lock for Python. From 3.20.4 until 4.0.9, ReadWriteLock and AsyncReadWriteLock versions from 3.20.4 resolve the lock path and pass it to SQLite without rejecting a final symbolic link, allowing anothe

How urgent is CVE-2026-112936?

Priority 30/100. Public exploit reference

Software pages

Python vulnerabilities · SQLite vulnerabilities

Related CVEs

CVE-2026-112940 HIGH 7.1 UPGRADE filelock is a platform-independent file lock for Python
CVE-2026-112934 MEDIUM 6.1 UPGRADE filelock is a platform-independent file lock for Python
CVE-2026-112911 MEDIUM 6.3 UPGRADE filelock is a platform-independent file lock for Python
CVE-2026-112912 LOW 2.5 UPGRADE filelock is a platform-independent file lock for Python
CVE-2026-112914 MEDIUM 5.3 UPGRADE filelock is a platform-independent file lock for Python

References

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