VULNERABILITY INTELLIGENCE
CVE-2026-82234
CVSS score8.2 HIGH
EPSS probability0.36%
CISA KEVNot currently listed
Published2026-08-28
Last modified2026-08-28
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N
Description
SiYuan versions before v3.8.1 contain a server-side request forgery vulnerability in the http_request and web_fetch agent tools that perform DNS resolution only at guard time without validating the connect-time resolution. Attackers can use DNS rebinding to answer the guard resolution with a public IP and the connect resolution with a private or metadata IP, bypassing the SSRF defense to access cloud instance metadata and internal services.
Weakness classification
- disclosure@vulncheck.com: CWE-918