CVE-2026-1388

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 9.2 before 18.7.5, 18.8 before 18.8.5, and 18.9 before 18.9.1 that could have allowed an unauthenticated user to cause regular expression denial of service by sending specially crafted input to a merge request endpoint under certain conditions.

CVSS v3.1

7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS

0.35% chance of exploitation in the next 30 days, 28th percentile

Published

2026-02-25

Updated

2026-02-26

Proof-of-concept exploits (1)

• https://hackerone.com/reports/3482893

References

• CVE Record
• NVD entry

Related

• CVE-2026-1387
• CVE-2026-13934
• CVE-2026-13768
• CVE-2026-1402
• CVE-2026-1375
• CVE-2026-1405