Denial of Service Vulnerability in GitLab CE/EE Products
CVE-2026-1456

6.5MEDIUM

Key Information:

Vendor

Gitlab
Status
Gitlab
Vendor
CVE Published:
11 February 2026

What is CVE-2026-1456?

A vulnerability in GitLab CE/EE allows unauthenticated users to trigger denial of service by submitting specially crafted markdown files. This leads to CPU exhaustion due to the exponential processing required when rendering markdown previews. The affected versions include GitLab CE/EE 18.7 prior to 18.7.4 and 18.8 prior to 18.8.4, posing significant risks for users reliant on these versions. Remediation is necessary to mitigate the potential impact of this vulnerability.

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Deploy the Patch

Affected Version(s)

GitLab 18.7 < 18.7.4

GitLab 18.8 < 18.8.4

References

https://gitlab.com/gitlab-org/gitlab/-/issues/587688
issue-trackingpermissions-required
https://hackerone.com/reports/3517928
technical-descriptionexploitpermissions-required
https://about.gitlab.com/releases/2026/02/10/patch-releas...

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Thanks [maksyche](https://hackerone.com/maksyche) for reporting this vulnerability through our HackerOne bug bounty program
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