The host is installed with GitLab CE/EE 1.0.2 before 14.10.5, 15.0 before 15.0.4 or 15.1 before 15.1.1 and is prone to a regular expression denial of service vulnerability. A flaw is present in the application, which fails to properly handle issues in unspecified vectors. Successful exploitation could allows an attacker to make a GitLab instance inaccessible via specially crafted web server response headers.