CVE-2025-12983

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 16.9 before 18.3.6, 18.4 before 18.4.4, and 18.5 before 18.5.2 that could have allowed an authenticated attacker to cause a denial of service condition by submitting specially crafted markdown content with nested formatting patterns.

CVSS v3.1

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

CVSS v3.1

3.5 LOWCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:L

EPSS

0.42% chance of exploitation in the next 30 days, 35th percentile

Published

2025-11-15

Updated

2025-11-17

Proof-of-concept exploits (1)

• https://hackerone.com/reports/3419588

References

• CVE Record
• NVD entry

Related

• CVE-2025-12973
• CVE-2025-1299
• CVE-2025-12954
• CVE-2025-13000
• CVE-2025-12939
• CVE-2025-13001