Critical 9.8Published Jul 16, 2026

CVE-2026-46562Yamcs: Remote Code Execution via Mission Database algorithm override

Updated under an hour ago (Oct 27, 2026, 7:40 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Every CVE for yamcs

Exploited in the last 30 days

Yamcs is a mission control framework. Prior to 5.12.7, the Nashorn ScriptEngine used to evaluate user-supplied JavaScript algorithm text in yamcs-core/src/main/java/org/yamcs/algorithms/ScriptAlgorithmExecutorFactory.java was constructed without a ClassFilter, so a user with the ChangeMissionDatabase privilege could override an algorithm through the MdbOverrideApi.updateAlgorithm endpoint and supply JavaScript that reaches arbitrary Java classes (for example Java.type("java.lang.Runtime").getRuntime().exec(...)) to execute arbitrary OS commands as the Yamcs process; in the default configuration with no security.yaml the built-in guest user has superuser=true, making the issue reachable without authentication. This issue is fixed in versions 5.12.7 and 5.13.0, which disable algorithm editing by default.

CVSS: 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-94, CWE-95, CWE-470
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Jul 16, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

yamcs yamcs yamcs:yamcs (from the name)	before 5.12.7	CNA record
spaceapplications yamcs spaceapplications:yamcs	before 5.12.7	NVD

References

References

https://github.com/yamcs/yamcs/security/advisories/GHSA-vmwp-vh32-rj75	x-refsource-confirm, exploit, vendor-advisory
https://github.com/yamcs/yamcs/commit/3c550348f866af4675d2ba4a51d8d12b7c7c6011	x-refsource-misc, patch
https://github.com/yamcs/yamcs/commit/4ff8fda642ea8c3309a4d3f379aa77b763148992	x-refsource-misc, patch
https://github.com/yamcs/yamcs/releases/tag/yamcs-5.12.7	x-refsource-misc, release-notes
https://github.com/yamcs/yamcs/releases/tag/yamcs-5.13.0	x-refsource-misc, release-notes

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.