The vulnerability exists due to viewing diffs of MR with conflicts can be slow. A remote attacker can perform a denial of service (DoS) attack.
https://www.bleepingcomputer.com/news/security/gitlab-warns-of-critical-arbitrary-branch-pipeline-execution-flaw/
Source: Mitre, NVD
Published: 2024-10-17
Base Score: 5
Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P
Severity: Medium
Base Score: 7.5
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Severity: High