GHSA-9jg3-g3wh-w9pj

Source

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

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-9jg3-g3wh-w9pj/GHSA-9jg3-g3wh-w9pj.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-9jg3-g3wh-w9pj

Aliases

CVE-2026-55552

Published

2026-08-28T17:20:42Z

Modified

2026-08-28T17:40:35Z

Severity

7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N CVSS Calculator

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/passwd file 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.

Database specific

{
    "cwe_ids": [
        "CWE-22"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-08-28T17:20:42Z",
    "nvd_published_at": null,
    "severity": "HIGH"
}

References

Affected packages

Maven / org.yamcs:yamcs-core

Package

Name: org.yamcs:yamcs-core; View open source insights on deps.dev
Purl: pkg:maven/org.yamcs/yamcs-core

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

5.12.0

Affected versions

0.*

0.29.3

0.30.0

3.*

3.0.0

3.1.0

3.1.1

3.1.2

3.2.0

3.2.1

3.2.2

3.3.0

3.3.1

3.4.0

3.4.1

3.4.2

3.4.3

3.4.4

3.4.5

3.4.6

3.4.8

3.4.11

4.*

4.0.0

4.0.1

4.1.1

4.1.2

4.2.0

4.2.1

4.2.2

4.3.0

4.3.1

4.4.0

4.4.1

4.4.2

4.5.0

4.6.0

4.6.1

4.6.2

4.6.3

4.7

4.7.1

4.7.3

4.8.0

4.8.1

4.9.0

4.9.1

4.9.2

4.9.3

4.9.4

4.10.0

4.10.1

4.10.2

4.10.3

4.10.4

4.10.5

4.10.6

4.10.7

4.10.8

4.10.9

5.*

5.0.0

5.1.0

5.1.1

5.1.2

5.1.3

5.1.4

5.2.0

5.2.1

5.2.2

5.2.3

5.2.4

5.2.5

5.2.6

5.3.0

5.3.1

5.3.2

5.3.3

5.3.4

5.3.5

5.3.6

5.4.0

5.4.1

5.4.2

5.4.3

5.4.4

5.4.5

5.5.0

5.5.1

5.5.2

5.5.3

5.5.4

5.5.5

5.5.6

5.5.7

5.6.0

5.6.1

5.6.2

5.7.0

5.7.1

5.7.2

5.7.3

5.7.4

5.7.5

5.7.6

5.7.7

5.7.8

5.7.9

5.7.10

5.7.11

5.7.12

5.7.13

5.8.0

5.8.1

5.8.2

5.8.3

5.8.4

5.8.5

5.8.6

5.8.7

5.8.8

5.9.0

5.9.1

5.9.2

5.9.3

5.9.4

5.9.5

5.9.6

5.9.7

5.9.8

5.9.8.1

5.9.9

5.9.10

5.9.11

5.9.12

5.10.0

5.10.1

5.10.2

5.10.3

5.10.4

5.10.5

5.10.6

5.10.7

5.10.8

5.10.9

5.10.10

5.10.11

5.10.12

5.11.0

5.11.1

5.11.2

5.11.3

5.11.4

5.11.5

5.11.6

5.11.7

5.11.8

5.11.9

5.11.10

5.11.11

5.11.12

5.11.13

Database specific

last_known_affected_version_range

"< 5.11.13"

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-9jg3-g3wh-w9pj/GHSA-9jg3-g3wh-w9pj.json"