CVE-2025-12983
Unknown Unknown - Not Provided
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.
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Meta Information
Published
2025-11-15
Last Modified
2025-11-19
Generated
2026-06-16
AI Q&A
2025-11-15
EPSS Evaluated
2026-06-15
NVD
CVE-2025-12983
Affected Vendors & Products
Showing 6 associated CPEs
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)
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Exploitability
CWE
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KEV
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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.
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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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