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CVE-2026-112908VulnerabilityPublished

virtualenvwrapper · filelock: StrictSoftFileLock creates its claim directories without the lock mode, so another local user with a write

Affects virtualenvwrapperSource GCVE Database

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Not known to be exploited · CVSS 5.3 Medium : upgrade to 6.1.1_4 when convenient.

Data as of 30 Oct 2026, 05:30 UTC

CVSS 3.1 base score
5.3Medium
How severe the flaw is on the 0–10 CVSS scale.
Patch
Available – fixed in 6.1.1_4
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/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 virtualenvwrapper to 6.1.1_4.

Affected software

ProductAffectedFixed in
Homebrewvirtualenvwrapperpkg:brew/virtualenvwrapperOther threatsAffected
  • >=6.1.1_3 <6.1.1_4
Fixed in
  • 6.1.1_4

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

AI-suggested

A patch is available in version 6.1.1_4 of virtualenvwrapper, which fixes the issue by properly setting permissions on claim directories. Users should upgrade to this fixed version. Additionally, existing <path>.filelock directories created by affected versions should be removed or have their permissions corrected (e.g., chmod) to prevent exploitation. No other actions are required if the patch is applied or the environment does not permit write access to the claim directories.

Description

The vulnerability in filelock versions >=3.30.0 and <=4.2.0 involves the creation of claim directories without proper restrictive permissions, allowing other local users with write access to these directories to unlink claim files. This can lead to multiple holders believing they have exclusive locks, causing integrity issues. The flaw requires specific environment conditions such as a permissive umask or default ACLs that grant write permissions to other users. The vulnerability has a medium severity with no confidentiality impact but high integrity impact.

References

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