CVE-2025-12983 Memory Allocation with Excessive Size Value in GitLab
An authenticated attacker can cause a denial of service in GitLab by submitting specially crafted markdown content with nested formatting patterns.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-12983?
CVE-2025-12983 is a low-severity denial of service vulnerability in Gitlab Gitlab, published on 15 Nov 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-789
Which versions are affected by CVE-2025-12983?
1 open source package ship an affected version, including gitlab. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
gitlab Bitnami | From 16.9.0 | 18.3.6, 18.4.4, 18.5.2 |
Products include Gitlab Gitlab.
How do I fix CVE-2025-12983?
Upgrade gitlab to a fixed version for your release line: 18.3.6, 18.4.4 or 18.5.2.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2025-12983 being exploited?
There is no known exploitation of CVE-2025-12983 in the wild and no public exploit code.
Other vulnerabilities in Gitlab Gitlab
- CVE-2026-97229 GitLab Community Edition and Enterprise Edition Integer Overflow or Wraparound
- CVE-2026-85706 GitLab Community Edition and Enterprise Edition Path Traversal
- CVE-2023-7028 GitLab Community and Enterprise Editions Improper Access Control
- CVE-2021-22205 GitLab Community and Enterprise Editions Remote Code Execution
- CVE-2021-39935 GitLab Community and Enterprise Editions Server-Side Request Forgery (SSRF)
Sources
Also known as BIT-gitlab-2025-12983, GHSA-9mv9-gw4x-7xw4, MINI-2gcp-8mv4-x5xm, MINI-3m2m-778g-5mm3, MINI-42mc-pgpp-58v5, MINI-77v7-33pm-h893 and 13 more.