CVE-2026-1456

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.7 before 18.7.4, and 18.8 before 18.8.4 that could have allowed an unauthenticated user to cause denial of service through CPU exhaustion by submitting specially crafted markdown files that trigger exponential processing in markdown preview.

CVSS v3.1

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

CVSS v3.1

6.5 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS

0.36% chance of exploitation in the next 30 days, 29th percentile

Published

2026-02-11

Proof-of-concept exploits (1)

• https://hackerone.com/reports/3517928

References

• CVE Record
• NVD entry

Related

• CVE-2026-14558
• CVE-2026-14561
• CVE-2026-14557
• CVE-2026-14567
• CVE-2026-14554
• CVE-2026-14568