What’s Vulnerable › Vulnerabilities

CVE-2025-12983: Memory Allocation with Excessive Size Value in GitLab

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-11-15 · updated 2026-10-19
• Weakness: CWE-789

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 products

• GitLab: from 16.9.0 before 18.3.6; from 18.4.0 before 18.4.4; from 18.5.0 before 18.5.2 — fixed in 18.3.6, 18.4.4, 18.5.2

How to fix

Upgrade to a fixed version: GitLab 18.3.6, 18.4.4, 18.5.2. Check the vendor advisory for mitigations.

References

• https://about.gitlab.com/releases/2025/11/12/patch-release-gitlab-18-5-2-released/
• https://gitlab.com/gitlab-org/gitlab/-/issues/296257
• https://hackerone.com/reports/3419588

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