CVE-2023-3994

Summary

CVE-2023-3994 is a vulnerability affecting GitLab CE/EE versions 9.3 before 16.0.8, 16.1 before 16.1.3, and 16.2 before 16.2.2. This issue allows an attacker to initiate a Regular Expression Denial of Service (ReDoS) by sending specially crafted payloads to the preview_markdown endpoint using the ProjectReferenceFilter. The vulnerability can lead to excessive resource consumption, potentially causing denial of service conditions on the affected GitLab server. It is essential for users to update their GitLab instances to the latest available versions to mitigate this risk.

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