CVE-2026-55552 (GCVE-0-2026-55552)
Vulnerability from cvelistv5 – Published: 2026-08-28 17:18 – Updated: 2026-08-31 18:54
VLAI
EPSS
VEX
Title
Yamcs: Unauthenticated Directory Traversal
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 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.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-31 15:42 UTC
CWE
- CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/yamcs/yamcs/security/advisorie… | x_refsource_CONFIRM |
| https://github.com/yamcs/yamcs/commit/c7dfd24e469… | x_refsource_MISC |
| https://github.com/yamcs/yamcs/commit/f4bc588880c… | x_refsource_MISC |
| https://github.com/yamcs/yamcs/releases/tag/yamcs… | x_refsource_MISC |
| https://github.com/yamcs/yamcs/releases/tag/yamcs… | x_refsource_MISC |
Impacted products
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FKIE_CVE-2026-55552
Vulnerability from fkie_nvd - Published: 2026-08-28 20:18 - Updated: 2026-09-08 21:08
Severity
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 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
Impacted products
| Vendor | Product | Version |
|---|
{
"affected": [
{
"affectedData": [
{
"product": "yamcs",
"vendor": "yamcs",
"versions": [
{
"status": "affected",
"version": "\u003c 5.12.0"
}
]
}
],
"source": "security-advisories@github.com"
}
],
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}
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GHSA-9JG3-G3WH-W9PJ
Vulnerability from github – Published: 2026-08-28 17:20 – Updated: 2026-08-28 17:20
VLAI
Summary
Yamcs has Unauthenticated Directory Traversal
Details
Attack type:
Unauthenticated remote
Impact:
Attackers can access any system files from the underlying host.
Affected components: HttpRequestHandler.java, StaticFileHandler.java
An Unauthenticated Directory Traversal vulnerability exists in Yamcs <=5.8.6, allowing anyone to access any file on the underlying operating system. This allows unauthenticated attackers to download sensitive files and data.
Steps to Reproduce:
- Start Yamcs and login as a user
- Paste the following URL in the browser and press enter:
http://localhost:8090//etc/passwd
- The
/etc/passwdfile will be downloaded.
Acknowledgements
This vulnerability was discovered by Abderrahim Dahmani while solving a STARPWN 2025 CTF challenge at DEFCON 33 offered by VisionSpace Technologies.
Severity
7.5 (High)
{
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},
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},
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"events": [
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"introduced": "0"
},
{
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}
],
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}
]
}
],
"aliases": [
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],
"database_specific": {
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],
"github_reviewed": true,
"github_reviewed_at": "2026-08-28T17:20:42Z",
"nvd_published_at": null,
"severity": "HIGH"
},
"details": "### Attack type:\u202f\nUnauthenticated remote\u202f \n\n### Impact: \nAttackers can access any system files from the underlying host.\n\n### Affected components: HttpRequestHandler.java, StaticFileHandler.java\n\nAn Unauthenticated Directory Traversal vulnerability exists in Yamcs \u003c=5.8.6, allowing anyone to access any file on the underlying operating system. This allows unauthenticated attackers to download sensitive files and data.\n\n\u003cimg width=\"2170\" height=\"1289\" alt=\"image\" src=\"https://github.com/user-attachments/assets/8d426da1-5351-4240-a290-8d858be61312\" /\u003e\n\n## Steps to Reproduce:\n1. Start Yamcs and login as a user\n2. Paste the following URL in the browser and press enter:\n\n```\nhttp://localhost:8090//etc/passwd\n```\n\n3. The `/etc/passwd` file will be downloaded.\n\n## Acknowledgements\nThis vulnerability was discovered by Abderrahim Dahmani while solving a STARPWN 2025 CTF challenge at DEFCON 33 offered by VisionSpace Technologies.",
"id": "GHSA-9jg3-g3wh-w9pj",
"modified": "2026-08-28T17:20:42Z",
"published": "2026-08-28T17:20:42Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/yamcs/yamcs/security/advisories/GHSA-9jg3-g3wh-w9pj"
},
{
"type": "WEB",
"url": "https://github.com/yamcs/yamcs/commit/c7dfd24e469ae1086c23e0fe04401cb1ce4260d4"
},
{
"type": "WEB",
"url": "https://github.com/yamcs/yamcs/commit/f4bc588880c166849e983aa8f65b9c8107d06091"
},
{
"type": "PACKAGE",
"url": "https://github.com/yamcs/yamcs"
},
{
"type": "WEB",
"url": "https://github.com/yamcs/yamcs/releases/tag/yamcs-5.11.13"
},
{
"type": "WEB",
"url": "https://github.com/yamcs/yamcs/releases/tag/yamcs-5.12.0"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
"type": "CVSS_V3"
}
],
"summary": "Yamcs has Unauthenticated Directory Traversal"
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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