CVE-2026-1403: GitLab

Medium severity, CVSS 6.5. EPSS: 0.3% chance of exploitation in the next 30 days.

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 11.7 before 18.8.9, 18.9 before 18.9.5, and 18.10 before 18.10.3 that when importing CSV files could have allowed an authenticated user to cause denial of service to Sidekiq workers due to improper validation of CSV file structure.

Affected products

• GitLab GitLab: from 11.7, before 18.8.9 (fixed in 18.8.9); from 18.9, before 18.9.5 (fixed in 18.9.5); from 18.10, before 18.10.3 (fixed in 18.10.3)

Published 2026-10-07. Last modified 2026-10-08.