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CVE PROGRAM SOURCE RECORD4.9 Medium

CVE-2026-27807

MarkUs: YAML alias (‘billion laughs’) DoS in config upload

Description

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

MarkUsProject Markus

  • < 2.9.4affected

References