CVE-2026-27807 — MarkUs: YAML alias (‘billion laughs’) DoS in config upload
MarkUs is a web application for the submission and grading of student assignments. Prior to version 2.9.4, MarkUs allows course instructors to upload YAML files to create/update…
Published: 2026-03-06 · CVSS: 4.9 · CVSS 3.1
MarkUs is a web application for the submission and grading of student assignments. Prior to version 2.9.4, MarkUs allows course instructors to upload YAML files to create/update various entities (e.g., assignment settings). These YAML files are parsed with aliases enabled. This issue has been patched in version 2.9.4.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7