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  4. CVE 2026 112940 filelock readwritelock sqlite reopens the lock
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Back to active CVEs
High · CVSS 7.1CVE-2026-112940

filelock ReadWriteLock: SQLite reopens the lock database by name, so a planted symlink or journal file makes the lock user's process overwrite or unlink its own filesCVE-2026-112940

Answer in brief

CVE-2026-112940 records a High severity (CVSS 7.1) vulnerability in filelock ReadWriteLock: SQLite reopens the lock database by name, so a planted symlink or journal file makes the lock user's process overwrite or unlink its own files. The current sources do not mark it as known exploited. The current feed maps tox-dev/filelock (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 20, 2026Updated Oct 20, 2026Source checked Oct 21, 2026First seen by HOL Oct 20, 2026Material review Oct 20, 2026
Upstream Advisory

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-363
Source
CVE List V5
Source checked
Oct 21, 2026
References
4 linked sources
Open source record

Key facts

Risk
High · CVSS 7.1
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 7.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps tox-dev/filelock (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
tox-dev/filelockgeneric>=3.20.4 <4.2.14.2.1

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for tox-dev/filelock.
  2. 2Review the reported fix. Update tox-dev/filelock to 4.2.1 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 20, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 20, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 20, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
Upstream source description

filelock is a platform-independent file lock for Python. From 3.20.4 until 4.2.1, ReadWriteLock let SQLite reopen the database and side files by name; on POSIX systems an attacker with rename access in a non-sticky parent can swap those names to cause overwrite or unlink operations, while a writable adjacent hot journal is additionally required for attacker-chosen content overwrites. This issue is fixed in version 4.2.1.

Quoted source text, attributed separately from HOL analysis.