CVE-2026-55511Public exploitNetwork attack vectorHinoki check available

Authenticated RCE via StreamSQL column-name injection

Published Aug 28, 2026 · Updated Aug 28, 2026

Code injection in the Yamcs StreamSQL compiler before 5.12.8 and 5.13.0 through 5.13.1 allows remote authenticated users to execute Java. Expression.fillCode_InputDefVars and SumExpression place an attacker-chosen double-quoted column name into generated Java source, which Janino SimpleCompiler.cook compiles without escaping or sandboxing. ControlArchiving privilege and access to executeSql are required; injected code runs with the Yamcs process's authority, exposing mission data and permitting tampering or service interruption.

CVSS severity9.1
Critical
EPSS probability0.68%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Code injection in the Yamcs StreamSQL compiler before 5.12.8 and 5.13.0 through 5.13.1 allows remote authenticated users to execute Java. Expression.fillCode_InputDefVars and SumExpression place an attacker-chosen double-quoted column name into generated Java source, which Janino SimpleCompiler.cook compiles without escaping or sandboxing. ControlArchiving privilege and access to executeSql are required; injected code runs with the Yamcs process's authority, exposing mission data and permitting tampering or service interruption.

The record

CVE
CVE-2026-55511
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

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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=< 5.12.8
  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

9.1GitHub, 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')
T1190Exploit Public-Facing Application

Public exploit references

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Technologies

Your stack

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Your stack

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