What is CVE-2026-82234?

CVE-2026-82234 is a high-severity vulnerability in Siyuan-Note Siyuan, classified under Server-Side Request Forgery (SSRF). CVSS score: 8.2/10. Published 2026-08-28.

How severe is CVE-2026-82234?

High severity. CVSS v3 base score is 8.2 out of 10.

SSRF in Siyuan-Note Siyuan

CVE-2026-82234

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.

Vulnerability class: SSRF (Server-Side Request Forgery)

CVSS v3 metric

CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N.

Affected products

Siyuan-note Siyuan

Weakness classification (CWE)

CWE-918 — Server-Side Request Forgery (SSRF)

References

disclosure@vulncheck.com (vendor-advisory)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-82234?: CVE-2026-82234 is a high-severity vulnerability in Siyuan-Note Siyuan, classified under Server-Side Request Forgery (SSRF). CVSS score: 8.2/10. Published 2026-08-28.
How severe is CVE-2026-82234?: High severity. CVSS v3 base score is 8.2 out of 10.