GitLab Webhook Denial of Service on Older Versions

Summary

Authenticated users on older GitLab versions can cause a service disruption by sending a specific type of header in a webhook. This affects all versions of GitLab from 16.11 up to 18.9.2, excluding versions 18.7.6, 18.8.6, and 18.9.2. Update to the latest version of GitLab to resolve this issue.

What to do

Update gitlab to version 18.9.2.

Affected software

Vendor	Product	Affected versions	Fix available
–	gitlab	> 18.9.0 , <= 18.9.2	18.9.2
gitlab	gitlab	> 16.11.0 , <= 18.7.6	–
gitlab	gitlab	> 16.11.0 , <= 18.7.6	–
gitlab	gitlab	> 18.8.0 , <= 18.8.6	–
gitlab	gitlab	> 18.8.0 , <= 18.8.6	–
gitlab	gitlab	> 18.9.0 , <= 18.9.2	–
gitlab	gitlab	> 18.9.0 , <= 18.9.2	–

Original title

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 16.11 before 18.7.6, 18.8 before 18.8.6, and 18.9 before 18.9.2 that could have allowed an authenticated user to cause a d...

Original description

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 16.11 before 18.7.6, 18.8 before 18.8.6, and 18.9 before 18.9.2 that could have allowed an authenticated user to cause a denial of service condition due to improper input validation on webhook custom header names under certain conditions.

nvd CVSS3.1 6.5

Vulnerability type

CWE-770 Allocation of Resources Without Limits