CVE-2025-12983

Published: Nov 15, 2025Modified: Jun 17, 2026

6.5

Vector

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

Exploitability: 2.8 / Impact: 3.6

Source: NVD

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.

Affected (6)

Products: Gitlab: Gitlab

Gitlab

1 product

Gitlab

Configuration A

6 vulnerable

Vulnerable Software	Affected Versions
Gitlab Gitlab	From 16.9.0 to 18.3.6
Gitlab Gitlab	From 18.4.0 to 18.4.4
Gitlab Gitlab	From 18.5.0 to 18.5.2
Gitlab Gitlab	From 16.9.0 to 18.3.6
Gitlab Gitlab	From 18.4.0 to 18.4.4
Gitlab Gitlab	From 18.5.0 to 18.5.2

Related CWEs

CWE-789

Memory Allocation with Excessive Size Value

The product allocates memory based on an untrusted, large size value, but it does not ensure that the size is within expected limits, allowing arbitrary amounts of memory to be allocated.

References (3)

https://about.gitlab.com/releases/2025/11/12/patch-release-gitlab-18-5-2-released/

Source: cve@gitlab.com

Release NotesVendor Advisory

https://gitlab.com/gitlab-org/gitlab/-/issues/296257

Source: cve@gitlab.com

Broken Link

https://hackerone.com/reports/3419588

Source: cve@gitlab.com

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Timeline

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