An issue has been discovered in GitLab CE/EE affecting all versions starting from 12.0 before 15.10.8, all versions starting from 15.11 before 15.11.7, all versions starting from 16.0 before 16.0.2. A Regular Expression Denial of Service was possible via sending crafted payloads to the preview_markdown endpoint.
| Software | From | Fixed in |
|---|---|---|
| gitlab / gitlab | 16.0.0 | 16.0.2 |
| gitlab / gitlab | 15.11.0 | 15.11.7 |
| gitlab / gitlab | 12.0.0 | 15.10.8 |