CVE-2026-82234 json
SiYuan before v3.8.1 SSRF via DNS-Rebinding TOCTOU
published 2026-08-28 2 mo ago modified 2026-10-07 32 d ago also EUVD-2026-67686 , GHSA-x8gv-g2g3-65fj , GO-2026-6657
- cvss
- 8.2
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 30%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- go github.com/siyuan-note/siyuan/kernel 0.0.0-20260813142806-dd2778b70d02
- siyuan-note siyuan 3.8.1
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 2 mo ago
Exploit prediction
0.36% chance of exploitation in the next 30 days, higher than 30% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 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 |
| CNA | 3.1 | 8.2 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N |
| GitHub | 3.1 | 8.2 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N |
| CNA | 4.0 | 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| go | github.com/siyuan-note/siyuan/kernel | <0.0.0-20260813142806-dd2778b70d02 |
0.0.0-20260813142806-dd2778b70d02 |
Affected products
- siyuan-note siyuan
Classification
- Weakness
-
- CWE-918 Server-Side Request Forgery
References
-
github.com
/siyuan-note/siyuan/commit/dd2778b70d020b15491ef7418f5f63214583cd63
web
-
github.com
/siyuan-note/siyuan/security/advisories/GHSA-x8gv-g2g3-65fj
vendor-advisory, web, advisory
-
vulncheck.com
/advisories/siyuan-before-3.8.1-ssrf-via-dns-rebinding-toctou
third-party-advisory
-
github.com
/siyuan-note/siyuan
package
-
github.com
/siyuan-note/siyuan/releases/tag/v3.8.1
web
Sources
- CVE List CVE-2026-82234
- GitHub Advisory GHSA-x8gv-g2g3-65fj
- NVD CVE-2026-82234
- OSV GO-2026-6657
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.