CVE-2026-55552

Description

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.

References

• https://github.com/yamcs/yamcs/commit/c7dfd24e469ae1086c23e0fe04401cb1ce4260d4
• https://github.com/yamcs/yamcs/commit/f4bc588880c166849e983aa8f65b9c8107d06091
• https://github.com/yamcs/yamcs/releases/tag/yamcs-5.11.13
• https://github.com/yamcs/yamcs/releases/tag/yamcs-5.12.0
• https://github.com/yamcs/yamcs/security/advisories/GHSA-9jg3-g3wh-w9pj