CVE-2026-46562: Yamcs is a mission control framework

Q: How do I fix CVE-2026-46562?

yamcs: upgrade to 5.12.7. Exact commands for each OS are on this page.

Q: Is CVE-2026-46562 being exploited?

CVE-2026-46562 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-46562 affect?

CVE-2026-46562 affects yamcs. Severity is critical (CVSS 9.8). 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 wi

Q: How urgent is CVE-2026-46562?

Priority 63/100. Critical severity; Public exploit reference; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2026-46562 is a critical-severity flaw (CVSS 9.8) affecting yamcs. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

Critical severity
Public exploit reference
CISA SSVC: automatable with total technical impact
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.0% (top 38%)
CISA exploited list	No
Weakness	CWE-94, CWE-95, CWE-470
Published	2026-07-16
Last modified	2026-07-20

Publisher (CNA): GitHub, Inc. · Vendor: spaceapplications

Last updated 2026-07-20 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-16 17:16 UTCPublished CVE record published
2026-07-20 01:53 UTCUpdated Record last modified

spaceapplications yamcs UPGRADE

Affected: < 5.12.7

Fixed in: 5.12.7

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy yamcs || rpm -q yamcs || yamcs --version

2. UPGRADE to 5.12.7 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade yamcs

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade yamcs

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Exact fixes by distribution

Maven · org.yamcs:yamcs-core · FIXED · 5.12.7 · vulnerable: < 5.12.7 · source

Set org.yamcs:yamcs-core to 5.12.7 or later in pom.xml or build.gradle, then rebuild and redeploy.

Fedora 46 · gcl · FIXED · 2.7.1-12.fc46 · FEDORA-2026-ff383a759b · source

sudo dnf upgrade --advisory=FEDORA-2026-ff383a759b

Fedora ELN · mozjs140 · FIXED · 140.13.0-5.eln159 · FEDORA-2026-f7ed0026e0 · source

sudo dnf upgrade --advisory=FEDORA-2026-f7ed0026e0

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Write-up: github.com/yamcs/yamcs/security/advisories/GHSA-vmwp-vh32-rj75

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-46562?

yamcs: upgrade to 5.12.7. Exact commands for each OS are on this page.

Is CVE-2026-46562 being exploited?

CVE-2026-46562 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-46562 affect?

CVE-2026-46562 affects yamcs. Severity is critical (CVSS 9.8). 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 wi

How urgent is CVE-2026-46562?

Priority 63/100. Critical severity; Public exploit reference; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

Software pages

Java vulnerabilities

Related CVEs

CVE-2026-46621 CRITICAL 9.1 UPGRADE Yamcs is a mission control framework
CVE-2026-55548 MEDIUM 4.3 UPGRADE Yamcs is a mission control framework
CVE-2026-44595 MEDIUM 4.3 UPGRADE Yamcs is a mission control framework
CVE-2026-44596 MEDIUM 6.5 UPGRADE Yamcs is a mission control framework
CVE-2026-44632 CRITICAL 9.1 UPGRADE Yamcs is a mission control framework

References

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