CVE-2026-1456
Denial of Service via Markdown Processing in GitLab CE/EE
Publication date: 2026-02-11
Last updated on: 2026-02-12
Assigner: GitLab Inc.
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| gitlab | gitlab | From 18.7.0 (inc) to 18.7.4 (exc) |
| gitlab | gitlab | From 18.8.0 (inc) to 18.8.4 (exc) |
| gitlab | gitlab | From 18.7.0 (inc) to 18.7.4 (exc) |
| gitlab | gitlab | From 18.8.0 (inc) to 18.8.4 (exc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-770 | The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability affects GitLab CE/EE versions from 18.7 before 18.7.4 and 18.8 before 18.8.4. It allows an unauthenticated user to cause a denial of service by submitting specially crafted markdown files. These files trigger exponential processing during markdown preview, leading to CPU exhaustion.
How can this vulnerability impact me? :
The vulnerability can cause denial of service by exhausting CPU resources. This means that an attacker could disrupt the availability of the GitLab service, potentially making it unusable for legitimate users.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
I don't know
How can this vulnerability be detected on my network or system? Can you suggest some commands?
I don't know
What immediate steps should I take to mitigate this vulnerability?
To mitigate this vulnerability, you should upgrade GitLab CE/EE to versions 18.7.4 or later if you are running any version from 18.7 before 18.7.4, or to 18.8.4 or later if you are running any version from 18.8 before 18.8.4.