Improper Neutralization of Special Elements Used in a Template Engine Affecting org.yamcs:yamcs-core package, versions [,5.12.8)[5.13.0,5.13.2)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JAVA-ORGYAMCS-19428650
- published29 Aug 2026
- disclosed28 Aug 2026
- creditUnknown
Introduced: 28 Aug 2026
NewCVE-2026-55559 (opens in a new tab)How to fix?
Upgrade org.yamcs:yamcs-core to version 5.12.8, 5.13.2 or higher.
Overview
Affected versions of this package are vulnerable to Improper Neutralization of Special Elements Used in a Template Engine via the templateArgs parameter in the createInstance process. An attacker can execute arbitrary commands on the host system by injecting malicious YAML content that results in the instantiation of a service capable of running system commands. This is only exploitable if the attacker has the CreateInstances privilege or if the server is configured without authentication (no security.yaml).