CVE-2026-55565Public exploitNetwork attack vectorHinoki check available

Authenticated code execution via unescaped LIKE pattern

Published Aug 28, 2026 · Updated Aug 28, 2026

Code injection in Yamcs before 5.12.8 and 5.13.0 through 5.13.1 allows remote authenticated users to execute OS commands. LikeExpression.fillCode_getValueReturn inserts the supplied LIKE pattern unescaped into Java source that Expression.getCompiledExpression sends to Janino's SimpleCompiler.cook. ReadTables, ReadEvents, ReadActivities, or ControlArchiving access is sufficient; a quote breaks the generated string literal and injected Java runs as the Yamcs server process.

CVSS severity9.9
Critical
EPSS probability0.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Code injection in Yamcs before 5.12.8 and 5.13.0 through 5.13.1 allows remote authenticated users to execute OS commands. LikeExpression.fillCode_getValueReturn inserts the supplied LIKE pattern unescaped into Java source that Expression.getCompiledExpression sends to Janino's SimpleCompiler.cook. ReadTables, ReadEvents, ReadActivities, or ControlArchiving access is sufficient; a quote breaks the generated string literal and injected Java runs as the Yamcs server process.

The record

CVE
CVE-2026-55565
Published
Aug 28, 2026
Updated
Aug 28, 2026
Vendor
Space Applications Services
Product
Yamcs
Classifications
CWE-94, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 28, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=< 5.12.8
  2. Affected versionversion=>= 5.13.0, < 5.13.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Space Applications Services · Yamcsversion=< 5.12.8; version=>= 5.13.0, < 5.13.2

Published CVSS scores

9.9GitHubCVSS:3.1/AV:N/AC:L/PR:L/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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')
T1190Exploit Public-Facing Application

Public exploit references

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

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo