BaseFortify

Publication date: 2025-11-15

Last updated on: 2025-11-19

Assigner: GitLab Inc.

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.

CVSS Scores

EPSS Scores

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Meta Information

Published

2025-11-15

Last Modified

2025-11-19

Generated

2026-07-06

AI Q&A

2025-11-15

EPSS Evaluated

2026-07-05

NVD

CVE-2025-12983

Affected Vendors & Products

Vendor	Product	Version / Range
gitlab	gitlab	From 16.9.0 (inc) to 18.3.6 (exc)
gitlab	gitlab	From 16.9.0 (inc) to 18.3.6 (exc)
gitlab	gitlab	From 18.4.0 (inc) to 18.4.4 (exc)
gitlab	gitlab	From 18.4.0 (inc) to 18.4.4 (exc)
gitlab	gitlab	From 18.5.0 (inc) to 18.5.2 (exc)
gitlab	gitlab	From 18.5.0 (inc) to 18.5.2 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-789	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.

Attack-Flow Graph

Executive Summary

This vulnerability in GitLab CE/EE allows an authenticated attacker to cause a denial of service (DoS) by submitting specially crafted markdown content with nested formatting patterns. It affects certain versions before specific patches were released.

Impact Analysis

The vulnerability can cause a denial of service condition, potentially making the affected GitLab service unavailable or unstable when processing malicious markdown content.

Mitigation Strategies

To mitigate this vulnerability, you should upgrade GitLab CE/EE to a fixed version: 18.3.6 or later for the 18.3 series, 18.4.4 or later for the 18.4 series, or 18.5.2 or later for the 18.5 series. Avoid using affected versions from 16.9 before 18.3.6, 18.4 before 18.4.4, and 18.5 before 18.5.2 to prevent denial of service caused by specially crafted markdown content.

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