CVE-2026-27807

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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
2026-07-15T01:48:51.924626705Z
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 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-776"
    ],
    "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
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
2aa90f8a047c2484147de12c464d08d4be964029
Database specific 
{
    "source": [
        "AFFECTED_FIELD",
        "CPE_RANGE",
        "REFERENCES"
    ],
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "2.9.4"
        }
    ],
    "cpe": "cpe:2.3:a:markusproject:markus:*:*:*:*:*:*:*:*"
}

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

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-27807.json"