CVE-2026-27807
MarkUs: YAML alias (‘billion laughs’) DoS in config upload
Summary
MarkUs: YAML alias (‘billion laughs’) DoS in config upload
Original description
The description as published by the source.
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: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV
References
- advisory github.com
- advisory github.com
- advisory nvd.nist.gov
- web github.com