Skip to main content
CVE-2026-123373VulnerabilityPublished

compose-lint: A committed symlink makes compose-lint quote a file from outside the project into its output

Affects compose-lintSource GCVE Database

0
Compare
Authoritative record:CVE-2026-123373· Low 2.3

Not known to be exploited · CVSS 2.3 Low : upgrade to 0.25.0 when convenient.

Data as of 10 Nov 2026, 17:47 UTC

CVSS 4.0 base score
2.3Low
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (GitHub_M)CVSS 4.02.3
Patch
Available – fixed in 0.25.0
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 9 Nov 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 10 Nov 2026.

What to do

Upgrade compose-lint and tmatens/compose-lint to 0.25.0.

Affected software

ProductAffectedFixed in
PyPIcompose-lintAffected
  • >=0.2.0 <0.25.0
Fixed in
  • 0.25.0
GitHubtmatens/compose-lintAffected
  • >=0.2.0 <0.25.0
Fixed in
  • 0.25.0

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

AI-suggested

Upgrade compose-lint to version 0.25.0 or later, where the issue is fixed. For older versions, avoid running compose-lint on untrusted pull requests on machines with sensitive files outside the checkout. Using the '--no-env' option can mitigate some exposure routes but does not fully prevent the issue. Later versions (0.32.0+) further restrict symlink following for Compose files outside the checkout. Review related advisories GHSA-6wcv-rj3c-mhv3 and GHSA-88f4-frh5-gmcr for sibling issues.

Description

compose-lint versions prior to 0.25.0 follow symlinks when reading project files, potentially exposing contents of files outside the project in its output. This can occur when a pull request commits a symlink pointing to sensitive files on the CI runner. The exposure includes quoted lines from non-YAML files and key names from env_file targets, visible in job logs and code scanning outputs. The issue is fixed starting from version 0.25.0, which restricts symlink resolution outside the project and removes quoted source lines from parse errors.

References

Community reviews

Loading reviews…