CVE-2025-12983

LOW

GitLab 16.9-18.3.5, 18.4-18.4.3, 18.5-18.5.1 - Authenticated Denial of Service via Nested Markdown Formatting

Title source: llm
STIX 2.1

Description

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.

References (3)

Core 3
Core References
Broken Link issue-tracking permissions-required
https://gitlab.com/gitlab-org/gitlab/-/issues/296257
Permissions Required technical-description exploit permissions-required
https://hackerone.com/reports/3419588

Scores

CVSS v3 3.5
EPSS 0.0037
EPSS Percentile 28.2%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:L

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-789
Status published
Products (1)
gitlab/gitlab 16.9.0 - 18.3.6 (2 CPE variants)
Published Nov 15, 2025
Tracked Since Feb 18, 2026