CVE-2026-55552highCWE-22

CVE-2026-55552: high-severity vulnerability in yamcs

Yamcs: Unauthenticated Directory Traversal

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36Vexday Risk Score

Patch soon. It has a working public exploit.

ssvc Attendcvss 7.5epss 1.7%
Yamcs is a mission control framework. Prior to 5.11.13, Yamcs StaticFileHandler.locateFile resolves an unauthenticated request path without using Path.normalize and Path.toAbsolutePath to confirm that the absolute path remains within the configured staticRoots. A path containing traversal segments can escape the intended web root and return an arbitrary readable host file. The flaw is in yamcs-core/src/main/java/org/yamcs/http/StaticFileHandler.java and can disclose sensitive operating-system and application data. This issue is fixed in version 5.11.13, and the 5.12 line is fixed from version 5.12.0.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Affected products
yamcs · yamcs
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In the same product, most dangerous first.

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