CVE-2026-82234

HIGHPre-NVD 8.28.2—
EchelonGraph scoreHIGH confidence

Score 8.2 from GitHub Security Advisory (severity: HIGH) published 2026-08-28. a secondary CVSS source baseline 8.2; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
8.2EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.2Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
8.2
EG Score
8.2(high)
EG Risk
42(Track)
EG Risk 42/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity82% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
25%
KEV
Not listed

Published

August 28, 2026

Last Modified

August 28, 2026

Advisory Details (2)

Auto-updated Aug 28, 2026
🔬 Proof of concept available. Patch available. Sources: github.
generic

SiYuan before v3.8.1 SSRF via DNS-Rebinding TOCTOU | Advisories | VulnCheck

https://www.vulncheck.com/advisories/siyuan-before-3.8.1-ssrf-via-dns-rebinding-toctou
github Patch Available🟡 PoC Available

SiYuan Agent Tools SSRF via DNS-Rebinding TOCTOU (Bypass of CheckHostSSRF) · Advisory · siyuan-note/siyuan · GitHub

https://github.com/siyuan-note/siyuan/security/advisories/GHSA-x8gv-g2g3-65fj

Vendor Advisories for CVE-2026-82234(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 25× in last 7d / 87× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-20 23:21 UTCEG score recompute
  2. 2026-09-20 23:21 UTCGHSA enrichment
  3. 2026-09-20 20:16 UTCEPSS rescore
  4. 2026-09-20 10:42 UTCGHSA enrichment
  5. 2026-09-19 22:25 UTCEG score recompute
  6. 2026-09-19 22:24 UTCGHSA enrichment
  7. 2026-09-19 10:01 UTCGHSA enrichment
  8. 2026-09-18 21:28 UTCEG score recompute
  9. 2026-09-18 21:28 UTCGHSA enrichment
  10. 2026-09-18 19:28 UTCEPSS rescore
  11. 2026-09-18 09:09 UTCGHSA enrichment
  12. 2026-09-17 20:51 UTCEG score recompute
  13. 2026-09-17 20:51 UTCGHSA enrichment
  14. 2026-09-17 07:19 UTCGHSA enrichment
  15. 2026-09-16 18:58 UTCEG score recompute
  16. 2026-09-16 18:58 UTCGHSA enrichment
  17. 2026-09-16 14:08 UTCEPSS rescore
  18. 2026-09-16 05:15 UTCEPSS rescore
  19. 2026-09-16 04:41 UTCGHSA enrichment
  20. 2026-09-15 16:23 UTCGHSA enrichment
  21. 2026-09-15 04:05 UTCEG score recompute
  22. 2026-09-15 04:05 UTCGHSA enrichment
  23. 2026-09-15 03:12 UTCEPSS rescore
  24. 2026-09-15 03:12 UTCEPSS rescore
  25. 2026-09-14 15:46 UTCGHSA enrichment
Show 62 more
  1. 2026-09-14 03:28 UTCEG score recompute
  2. 2026-09-14 03:28 UTCGHSA enrichment
  3. 2026-09-13 15:11 UTCGHSA enrichment
  4. 2026-09-13 02:53 UTCEG score recompute
  5. 2026-09-13 02:53 UTCGHSA enrichment
  6. 2026-09-12 14:35 UTCGHSA enrichment
  7. 2026-09-12 02:17 UTCEG score recompute
  8. 2026-09-12 02:17 UTCGHSA enrichment
  9. 2026-09-11 14:53 UTCEPSS rescore
  10. 2026-09-11 14:53 UTCEPSS rescore
  11. 2026-09-11 13:59 UTCEG score recompute
  12. 2026-09-11 13:59 UTCGHSA enrichment
  13. 2026-09-11 01:41 UTCGHSA enrichment
  14. 2026-09-10 13:23 UTCEG score recompute
  15. 2026-09-10 13:23 UTCGHSA enrichment
  16. 2026-09-10 01:05 UTCGHSA enrichment
  17. 2026-09-09 12:46 UTCGHSA enrichment
  18. 2026-09-09 00:29 UTCEG score recompute
  19. 2026-09-09 00:29 UTCGHSA enrichment
  20. 2026-09-08 22:01 UTCEPSS rescore
  21. 2026-09-08 03:20 UTCGHSA enrichment
  22. 2026-09-07 15:02 UTCGHSA enrichment
  23. 2026-09-07 02:12 UTCGHSA enrichment
  24. 2026-09-06 13:52 UTCEG score recompute
  25. 2026-09-06 13:52 UTCGHSA enrichment
  26. 2026-09-06 13:48 UTCEPSS rescore
  27. 2026-09-06 01:34 UTCEG score recompute
  28. 2026-09-06 01:34 UTCGHSA enrichment
  29. 2026-09-05 15:31 UTCEPSS rescore
  30. 2026-09-05 13:17 UTCGHSA enrichment
  31. 2026-09-05 00:57 UTCEG score recompute
  32. 2026-09-05 00:56 UTCGHSA enrichment
  33. 2026-09-04 12:36 UTCEG score recompute
  34. 2026-09-04 12:36 UTCGHSA enrichment
  35. 2026-09-04 05:07 UTCEPSS rescore
  36. 2026-09-04 00:16 UTCGHSA enrichment
  37. 2026-09-03 11:56 UTCGHSA enrichment
  38. 2026-09-02 23:36 UTCEG score recompute
  39. 2026-09-02 23:36 UTCGHSA enrichment
  40. 2026-09-02 14:12 UTCEPSS rescore
  41. 2026-09-02 11:16 UTCGHSA enrichment
  42. 2026-09-01 22:58 UTCEG score recompute
  43. 2026-09-01 22:58 UTCGHSA enrichment
  44. 2026-09-01 13:54 UTCEPSS rescore
  45. 2026-09-01 10:40 UTCGHSA enrichment
  46. 2026-08-31 22:22 UTCGHSA enrichment
  47. 2026-08-31 10:04 UTCGHSA enrichment
  48. 2026-08-30 21:45 UTCEG score recompute
  49. 2026-08-30 21:45 UTCGHSA enrichment
  50. 2026-08-30 19:18 UTCEPSS rescore
  51. 2026-08-30 19:17 UTCEPSS rescore
  52. 2026-08-30 09:28 UTCEG score recompute
  53. 2026-08-30 09:27 UTCGHSA enrichment
  54. 2026-08-30 01:22 UTCEPSS rescore
  55. 2026-08-29 21:07 UTCGHSA enrichment
  56. 2026-08-29 08:49 UTCGHSA enrichment
  57. 2026-08-28 20:30 UTCGHSA enrichment
  58. 2026-08-28 18:57 UTCEG score recompute
  59. 2026-08-28 18:57 UTCGHSA enrichment
  60. 2026-08-28 12:23 UTCEG score recompute
  61. 2026-08-28 11:24 UTCEG score recompute
  62. 2026-08-28 11:19 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-82234?
CVE-2026-82234 is a high vulnerability published on August 28, 2026. SiYuan versions before v3.8.1 contain a server-side request forgery vulnerability in the httprequest and webfetch 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…
When was CVE-2026-82234 disclosed?
CVE-2026-82234 was first published in the National Vulnerability Database on August 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-82234 actively exploited?
CVE-2026-82234 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 74.7% of all scored CVEs.
What is the CVSS score of CVE-2026-82234?
CVE-2026-82234 has a CVSS v3 base score of 8.2 (NVD).
How do I remediate CVE-2026-82234?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-82234, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-82234

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