---
id: CVE-2026-55552
title: Yamcs is a mission control framework
summary: >-
  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…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'
cwe:
  - CWE-22
vendor: yamcs
product: 'org.yamcs:yamcs-core'
affected:
  - 'org.yamcs:yamcs-core < 5.11.13'
patched:
  - 'org.yamcs:yamcs-core 5.12.0'
published: '2026-08-28'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T21:08:37.320'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-55552'
references:
  - url: >-
      https://github.com/yamcs/yamcs/commit/c7dfd24e469ae1086c23e0fe04401cb1ce4260d4
    label: security-advisories@github.com
  - url: >-
      https://github.com/yamcs/yamcs/commit/f4bc588880c166849e983aa8f65b9c8107d06091
    label: security-advisories@github.com
  - url: 'https://github.com/yamcs/yamcs/releases/tag/yamcs-5.11.13'
    label: security-advisories@github.com
  - url: 'https://github.com/yamcs/yamcs/releases/tag/yamcs-5.12.0'
    label: security-advisories@github.com
  - url: 'https://github.com/yamcs/yamcs/security/advisories/GHSA-9jg3-g3wh-w9pj'
    label: security-advisories@github.com
  - url: 'https://github.com/advisories/GHSA-9jg3-g3wh-w9pj'
tags:
  - nvd
  - ghsa
  - maven
epss: 0.00428
epssPercentile: 0.36683
aliases:
  - GHSA-9jg3-g3wh-w9pj
ecosystem: maven
ingestedAt: '2026-08-28T17:22:56.003Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-55552)

Affected packages:

- `org.yamcs:yamcs-core < 5.11.13`

Patched in:

- `org.yamcs:yamcs-core 5.12.0`

Source: https://github.com/advisories/GHSA-9jg3-g3wh-w9pj