CVE-2025-5996: 
GitLab vulnerability analysis and mitigation

A Denial of Service (DoS) vulnerability (CVE-2025-5996) has been identified in GitLab CE/EE affecting all versions from 2.1.0 before 17.10.8, 17.11 before 17.11.4, and 18.0 before 18.0.2. The vulnerability was discovered through GitLab's HackerOne bug bounty program by researcher pwnie and was disclosed on June 11, 2025 (GitLab Patch).

The vulnerability stems from a lack of input validation in HTTP responses that could be exploited when integrating malicious third-party components into a GitLab project. The vulnerability has been assigned a CVSS v3.1 score of 6.5 (Medium) with the vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H, indicating network accessibility with low attack complexity and requiring low privileges (GitLab Patch, NVD).

If successfully exploited, this vulnerability could allow an authenticated attacker to deny access to legitimate users of the targeted system through malicious third-party component integration. The impact is primarily focused on system availability, with no direct effect on confidentiality or integrity (GitLab Patch).

GitLab has released patches to address this vulnerability in versions 17.10.8, 17.11.4, and 18.0.2. Users are strongly recommended to upgrade to these patched versions immediately. GitLab.com is already running the patched version, and GitLab Dedicated customers do not need to take action (GitLab Patch).