CVE-2026-55552
Yamcs: Unauthenticated Directory Traversal
- State
- Published
- Severity
- 7.5 High
- Published
- Aug 28, 2026
- Updated
- Aug 31, 2026
- Reserved
- Jun 16, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N | GitHub_M |
Weaknesses
- CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Affected Products
| Product | Versions |
|---|---|
yamcsyamcs |
|
References
- https://github.com/yamcs/yamcs/security/advisories/GHSA-9jg3-g3wh-w9pj
- 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
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