CVE-2026-82234

HighCVSS 8.2/10Last modified Aug 28, 2026

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.

Metrics

CVSS 3.1 8.2/10CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N

Weakness enumeration

CWE-918

Affected software

No affected versions have been published.

Timeline

Published: Aug 28, 2026
Last modified: Aug 28, 2026
NVD status: Deferred

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