CVE-2026-27807
- Source
- https://cve.org/CVERecord?id=CVE-2026-27807
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-27807.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-27807
- Aliases
-
- GHSA-m9rx-85mx-q9h6
- Published
- 2026-03-06T02:48:28.384Z
- Modified
- 2026-04-10T05:37:23.003528Z
- Severity
-
- 4.9 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
- Summary
- MarkUs: YAML alias (‘billion laughs’) DoS in config upload
- Details
-
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.
- Database specific
{ "cwe_ids": [ "CWE-776" ], "cna_assigner": "GitHub_M", "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27807.json" }- References
Affected packages
Git / github.com/markusproject/markus
Affected ranges
- Type
- GIT
- Repo
- https://github.com/markusproject/markus
- Events
-
Introduced0 Unknown introduced commit / All previous commits are affectedFixed
Affected versions
0.*
0.10.0
1.*
1.8.0-rc1
v1.*
v1.10.0
v1.10.0-rc
v1.10.1
v1.10.1-rc
v1.10.2
v1.10.3
v1.10.4
v1.11.0
v1.11.1
v1.11.2
v1.11.3
v1.11.4
v1.11.5
v1.12.0
v1.12.1
v1.12.2
v1.12.3
v1.12.4
v1.12.5
v1.13.0
v1.13.1
v1.13.2
v1.13.3
v1.14.0
v1.8.0
v1.8.0-rc2
v1.8.1
v1.8.2
v1.8.3
v1.8.4
v1.9.0
v1.9.1
v1.9.2
v1.9.3
v2.*
v2.0.0
v2.0.1
v2.0.10
v2.0.2
v2.0.3
v2.0.4
v2.0.5
v2.0.6
v2.0.7
v2.0.8
v2.0.9
v2.1.0
v2.1.1
v2.1.2
v2.1.3
v2.1.4
v2.1.5
v2.1.6
v2.1.7
v2.2.0
v2.2.1
v2.2.2
v2.2.3
v2.2.4
v2.3.0
v2.3.1
v2.3.2
v2.3.3
v2.3.4
v2.4.0
v2.4.1
v2.4.10
v2.4.11
v2.4.12
v2.4.2
v2.4.3
v2.4.4
v2.4.5
v2.4.6
v2.4.7
v2.4.8
v2.4.9
v2.5.0
v2.5.1
v2.5.2
v2.5.3
v2.6.0
v2.6.1
v2.7.0
v2.7.1
v2.8.0
v2.8.1
v2.8.2
v2.9.0
v2.9.1
v2.9.2
v2.9.3