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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| yamcs | yamcs | < 5.12.0 | — |
Automated scanner template
A ready-made Nuclei template detects this vulnerability automatically. Vulnerabilities with public scanner templates are typically probed across the internet soon after the template appears — exposed systems should be patched first.
- Yamcs <=5.11.12 - Arbitrary File Read http/cves/2026/CVE-2026-55552.yaml
Source: projectdiscovery/nuclei-templates (MIT) — updated daily. Only links are listed.
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Maven | org.yamcs:yamcs-core | < 5.12.0 | 5.12.0 | GHSA-9jg3-g3wh-w9pj |
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