CVE-2026-82234CWE-918ssrf

CVE-2026-82234

High · published August 28, 2026

CVSS v3.1
8.2
EPSS
0%
Percentile
28.9
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
8.2 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N
CVSS v4.0
8.4 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:L/VA:N/SC:H/SI:L/SA:N
EPSS
0.00362 · 28.9th percentile
Weakness
CWE-918 · Server-Side Request Forgery (SSRF)
Published
2026-08-28T16:16Z
References (2)
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-x8gv-g2g3-65fj · [email protected]https://www.vulncheck.com/advisories/siyuan-before-3.8.1-ssrf-via-dns-rebinding-toctou · [email protected]
EPSS history
Timeline
  • 30 AUG 16:19Z
    EPSS moved — → 0%
    epss
  • 28 AUG 10:49Z
    SiYuan before v3.8.1 SSRF via DNS-Rebinding TOCTOU
    cvelistv5