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CVE-2026-46621

Spaceapplications Yamcs remote code execution

9.1 CRITICALPublic exploitEPSS 1.12%
  1. Published16 Jul 2026

Description

Yamcs is a mission control framework. Prior to 5.12.7, the Yamcs script evaluation engine for Python algorithms dynamically compiled and evaluated user-controlled algorithm text using Jython through the JSR-223 ScriptEngine API without enforcing a secure sandbox, so an authenticated user with the ChangeMissionDatabase privilege could override an existing Python algorithm's logic through the mission database REST API and import and execute arbitrary Java classes such as java.lang.Runtime to achieve remote code execution on the underlying host operating system. This issue is fixed in versions 5.12.7 and 5.13.0, which disable algorithm editing by default.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredHigh
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Affected products

Spaceapplications Yamcs< 5.12.7

Remediation

Fixed in
Spaceapplications Yamcs≥ 5.12.7

References

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Frequently asked

Is CVE-2026-46621 being actively exploited?

CVE-2026-46621 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 1.12%.

How severe is CVE-2026-46621?

CVE-2026-46621 has a CVSS 3.1 base score of 9.1, rated critical. EPSS estimates a 1.12% probability of exploitation.

Which products are affected by CVE-2026-46621?

Affected products include Spaceapplications Yamcs.

How do I fix CVE-2026-46621?

Upgrade affected software to a fixed version, for example Spaceapplications Yamcs 5.12.7 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-46621 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.