CVE-2026-46621Public exploitNetwork attack vector

Authenticated host command execution via Jython injection

Published Jul 16, 2026 · Updated Jul 16, 2026

Code injection in Space Applications Services Yamcs before 5.12.7 allows remote authenticated users to execute arbitrary host commands. The Python algorithm engine evaluates REST-supplied text through an unsandboxed Jython JSR-223 engine, exposing Java classes such as java.lang.Runtime. Exploitation requires ChangeMissionDatabase privilege, Jython on the classpath, and an existing Python algorithm whose logic can be replaced.

CVSS severity9.1
Critical
EPSS probability1.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in Space Applications Services Yamcs before 5.12.7 allows remote authenticated users to execute arbitrary host commands. The Python algorithm engine evaluates REST-supplied text through an unsandboxed Jython JSR-223 engine, exposing Java classes such as java.lang.Runtime. Exploitation requires ChangeMissionDatabase privilege, Jython on the classpath, and an existing Python algorithm whose logic can be replaced.

The record

CVE
CVE-2026-46621
Published
Jul 16, 2026
Updated
Jul 16, 2026
Vendor
Space Applications Services
Product
Yamcs
Classifications
CWE-94, T1059.006
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 16, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 5.12.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Space Applications Services · Yamcsversion=< 5.12.7

Published CVSS scores

9.1GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
T1059.006Command and Scripting Interpreter: Python

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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