VULNRABLE / Vulnerability / CVE-2026-55559

CVE-2026-55559

CRITICAL WATCH org.yamcs:yamcs-core GHSA

Exploit verdict: CVSS 9.5 · critical severity

CVSS Score

9.5

Severity

CRITICAL

EPSS

Source

GHSA

Summary

Yamcs vulnerable to Remote Code Execution via instance-template argument YAML injection (createInstance)

What this means

CVE-2026-55559 is a critical-severity vulnerability affecting org.yamcs:yamcs-core, rated CVSS 9.5. The EPSS model estimates a 1% probability of exploitation in the next 30 days. Published August 28, 2026.

View full advisory at GHSA →