CVE-2026-1456

Analyzed Analyzed - Analysis Complete

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

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.7 before 18.7.4, and 18.8 before 18.8.4 that could have allowed an unauthenticated user to cause denial of service through CPU exhaustion by submitting specially crafted markdown files that trigger exponential processing in markdown preview.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-02-11

Last Modified

2026-02-12

Generated

2026-07-06

AI Q&A

2026-02-11

EPSS Evaluated

2026-07-05

NVD

CVE-2026-1456

EUVD

EUVD-2026-7048

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

KEV

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

Executive Summary

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.

Impact Analysis

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.

Compliance Impact

I don't know

Detection Guidance

I don't know

Mitigation Strategies

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.

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