CVE-2026-12635 PUBLISHED

Reliance on Reverse DNS Resolution for a Security-Critical Action in GitLab

Assigner: GitLab
Reserved: 18.06.2026 Published: 25.06.2026 Updated: 25.06.2026

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 8.3 before 18.11.6, 19.0 before 19.0.3, and 19.1 before 19.1.1 that under certain conditions could have allowed an authenticated user with maintainer-role permissions to make requests to internal network resources through mirror synchronization due to improper URL validation.

Metrics

CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:N
CVSS Score: 0

Product Status

Vendor GitLab
Product GitLab
Versions Default: unaffected
  • affected from 8.3 to 18.11.6 (excl.)
  • affected from 19.0 to 19.0.3 (excl.)
  • affected from 19.1 to 19.1.1 (excl.)

Solutions

Upgrade to versions 18.11.6, 19.0.3, 19.1.1 or above.

Credits

  • This vulnerability has been discovered internally by GitLab team member Félix Veillette-Potvin finder

References

Problem Types

  • CWE-350: Reliance on Reverse DNS Resolution for a Security-Critical Action CWE