CVE-2026-46621: Yamcs is a mission control framework

Q: How do I fix CVE-2026-46621?

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

Q: Is CVE-2026-46621 being exploited?

CVE-2026-46621 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-2026-46621 affect?

CVE-2026-46621 affects yamcs. Severity is critical (CVSS 9.1). 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 enfo

Q: How urgent is CVE-2026-46621?

Priority 53/100. Critical severity; Public exploit reference

This month

CRITICAL 9.1UPGRADE

CVE-2026-46621 is a critical-severity flaw (CVSS 9.1) 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 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 arbitra

Why this priority

Critical severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	1.1% (top 34%)
CISA exploited list	No
Weakness	CWE-94
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 01:46 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.

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-2026-46621?

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

Is CVE-2026-46621 being exploited?

CVE-2026-46621 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-2026-46621 affect?

CVE-2026-46621 affects yamcs. Severity is critical (CVSS 9.1). 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 enfo

How urgent is CVE-2026-46621?

Priority 53/100. Critical severity; Public exploit reference

Software pages

Python vulnerabilities

Related CVEs

CVE-2026-46562 CRITICAL 9.8 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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