A vulnerability was discovered in GitLab runner versions before 13.1.3, 13.2.3 and 13.3.1. It was possible to make the gitlab-runner process crash by sending malformed queries, resulting in a denial of service.
https://gitlab.com/gitlab-org/gitlab-runner/-/issues/26819
https://gitlab.com/gitlab-org/gitlab-runner/-/issues/25857
https://gitlab.com/gitlab-org/cves/-/blob/master/2020/CVE-2020-13310.json