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CVE-2026-112907VulnerabilityPublished

lexicon · filelock: On Windows an oplock on a soft lock's marker holds SoftFileLock.acquire() past its timeout and blocks the

Affects lexiconSource GCVE Database

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Not known to be exploited · CVSS 2.5 Low : upgrade to 3.25.2_5 when convenient.

Data as of 30 Oct 2026, 07:33 UTC

CVSS 3.1 base score
2.5Low
How severe the flaw is on the 0–10 CVSS scale.
Patch
Available – fixed in 3.25.2_5
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 29 Oct 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.

What to do

Upgrade lexicon to 3.25.2_5.

Affected software

ProductAffectedFixed in
Homebrewlexiconpkg:brew/lexiconOther threatsAffected
  • >=3.23.2_4 <3.25.2_5
Fixed in
  • 3.25.2_5

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A fix is available in filelock version 3.25.2_5. Users should upgrade to this version or later to resolve the issue. No other mitigation is required as the vulnerability depends on a stale marker file and local read access. The maintainers have addressed the problem in the specified fixed version.

Description

On Windows, certain soft lock implementations in filelock (versions 3.22.0 through 4.2.0) can be blocked indefinitely due to Windows opportunistic locks (oplocks) on the lock marker file. Another local user with read access can take a Level 1 oplock on a stale marker file and never release it, causing SoftFileLock.acquire() calls to hang past their timeout. This results in partial availability impact without compromising confidentiality or integrity. The issue is fixed in filelock version 3.25.2_5.

References

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