What is GHSA-6h86-3g39-r63x?

GHSA-6h86-3g39-r63x is a security advisory published by GitHub Security Advisories with Medium severity. SiYuan before 3.8.10 contains a server-side request forgery vulnerability in the skill-install...

Which CVE IDs does GHSA-6h86-3g39-r63x cover?

GHSA-6h86-3g39-r63x covers the following CVE IDs: CVE-2026-126393. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-6h86-3g39-r63x?

GHSA-6h86-3g39-r63x has a CVSS v3 base score of 6.1, published by GitHub Security Advisories.

GHSA-6h86-3g39-r63xMediumCVSS 6.1

SiYuan before 3.8.10 contains a server-side request forgery vulnerability in the skill-install...

Vendor

GitHub Security Advisories

Published

November 13, 2026

Last Modified

November 13, 2026

🔗 CVE IDs covered (1)

CVE-2026-126393 →

📋 Description

SiYuan before 3.8.10 contains a server-side request forgery vulnerability in the skill-install download path because fetchBytes performs only a parse-time hostname check instead of using ssrfSafeClient. Attackers can supply a skill URL via the MCP skill install action that redirects or DNS-rebinds to loopback addresses, reaching internal services and metadata endpoints.

🔗 References (4)

https://github.com/siyuan-note/siyuan/security/advisories/GHSA-6pg3-pqxw-jm82
https://nvd.nist.gov/vuln/detail/CVE-2026-126393
https://www.vulncheck.com/advisories/siyuan-before-3.8.10-ssrf-via-skill-install-download-redirect-and-dns-rebinding
https://github.com/advisories/GHSA-6h86-3g39-r63x