CVE-2026-74905

HIGHPre-NVD 7.17.1—
EchelonGraph scoreMEDIUM confidence

Score 7.1 from GitHub Security Advisory published 2026-08-18. A secondary CVSS source baseline 7.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
7.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 7.1Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

SiYuan before v3.7.4 contains a server-side request forgery (SSRF) vulnerability in the isPrivateIP function in kernel/util/net.go, used by SSRFSafeDialer to enforce SSRF protection in SafeMode. The function only checks for loopback, link-local unicast, private, and unspecified addresses and does not recognize IPv6 transition addresses (NAT64 64:ff9b::/96, 6to4 2002::/16, Teredo 2001::/32) that embed private IPv4 destinations. When SafeMode is enabled, an authenticated attacker can bypass the SSRF guard via the network forward proxy, WebSocket proxy, or SSE proxy endpoints by supplying a URL whose hostname resolves to such a transition address, reaching internal services and cloud metadata endpoints (e.g., 169.254.169.254). Because the forward proxy returns the full response body, this is a full-read SSRF that can be used to steal instance credentials, reach internal services, and port-scan internal infrastructure.

CVSS v3
7.1
EG Score
7.1HIGHmedium confidence
EG Risk
48
EG Risk 48/100CISA SSVC

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
Severity71% × 45%
Exploitation40% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.4%
EPSS %ILE
26th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 18, 2026

Last Modified

August 26, 2026

Advisory Details (2)

Auto-updated Aug 18, 2026
🔬 Proof of concept available. Patch available. Sources: github.
generic

SiYuan before v3.7.4 SSRF via IPv6 Transition Address Bypass | Advisories | VulnCheck

https://www.vulncheck.com/advisories/siyuan-before-ssrf-via-ipv6-transition-address-bypass
github Patch Available🟡 PoC Available

SSRF via IPv6 Transition Address Bypass of SSRFSafeDialer Guard in SafeMode · Advisory · siyuan-note/siyuan · GitHub

https://github.com/siyuan-note/siyuan/security/advisories/GHSA-qq8m-8p8v-x4xg

Vendor Advisories for CVE-2026-74905(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 21× in last 7d / 98× 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.

Showing the most recent 100 of 174 total refreshes for this CVE.

  1. 2026-10-05 09:41 UTCEG score recompute
  2. 2026-10-05 09:41 UTCGHSA enrichment
  3. 2026-10-04 23:22 UTCEPSS rescore
  4. 2026-10-04 21:46 UTCGHSA enrichment
  5. 2026-10-04 05:39 UTCGHSA enrichment
  6. 2026-10-03 17:44 UTCEG score recompute
  7. 2026-10-03 17:44 UTCGHSA enrichment
  8. 2026-10-03 14:26 UTCEPSS rescore
  9. 2026-10-02 15:43 UTCGHSA enrichment
  10. 2026-10-02 01:32 UTCEG score recompute
  11. 2026-10-02 01:32 UTCGHSA enrichment
  12. 2026-10-01 19:50 UTCEPSS rescore
  13. 2026-10-01 09:47 UTCGHSA enrichment
  14. 2026-09-30 21:51 UTCEG score recompute
  15. 2026-09-30 21:51 UTCGHSA enrichment
  16. 2026-09-30 09:55 UTCEG score recompute
  17. 2026-09-30 09:55 UTCGHSA enrichment
  18. 2026-09-29 15:24 UTCEPSS rescore
  19. 2026-09-28 21:58 UTCEG score recompute
  20. 2026-09-28 21:58 UTCGHSA enrichment
  21. 2026-09-28 13:52 UTCEPSS rescore
  22. 2026-09-28 09:32 UTCGHSA enrichment
  23. 2026-09-27 21:37 UTCEG score recompute
  24. 2026-09-27 21:36 UTCGHSA enrichment
  25. 2026-09-27 13:48 UTCEPSS rescore
Show 75 more
  1. 2026-09-27 08:03 UTCEG score recompute
  2. 2026-09-27 08:03 UTCGHSA enrichment
  3. 2026-09-26 15:59 UTCEPSS rescore
  4. 2026-09-26 00:28 UTCEPSS rescore
  5. 2026-09-25 01:44 UTCEG score recompute
  6. 2026-09-25 01:44 UTCGHSA enrichment
  7. 2026-09-24 14:04 UTCEPSS rescore
  8. 2026-09-24 08:23 UTCGHSA enrichment
  9. 2026-09-23 20:28 UTCEG score recompute
  10. 2026-09-23 20:28 UTCGHSA enrichment
  11. 2026-09-23 17:54 UTCEPSS rescore
  12. 2026-09-23 08:32 UTCGHSA enrichment
  13. 2026-09-22 20:36 UTCEG score recompute
  14. 2026-09-22 20:36 UTCGHSA enrichment
  15. 2026-09-22 16:01 UTCEPSS rescore
  16. 2026-09-22 06:32 UTCEG score recompute
  17. 2026-09-22 06:32 UTCGHSA enrichment
  18. 2026-09-21 21:09 UTCEPSS rescore
  19. 2026-09-21 18:35 UTCGHSA enrichment
  20. 2026-09-21 06:08 UTCEG score recompute
  21. 2026-09-21 06:08 UTCGHSA enrichment
  22. 2026-09-20 20:16 UTCEPSS rescore
  23. 2026-09-20 16:37 UTCGHSA enrichment
  24. 2026-09-20 04:41 UTCGHSA enrichment
  25. 2026-09-19 16:43 UTCEG score recompute
  26. 2026-09-19 16:43 UTCGHSA enrichment
  27. 2026-09-19 04:42 UTCEG score recompute
  28. 2026-09-19 04:42 UTCGHSA enrichment
  29. 2026-09-18 19:28 UTCEPSS rescore
  30. 2026-09-18 16:46 UTCGHSA enrichment
  31. 2026-09-18 03:38 UTCEG score recompute
  32. 2026-09-18 03:38 UTCGHSA enrichment
  33. 2026-09-17 15:42 UTCEG score recompute
  34. 2026-09-17 15:42 UTCGHSA enrichment
  35. 2026-09-17 03:44 UTCGHSA enrichment
  36. 2026-09-16 15:13 UTCEG score recompute
  37. 2026-09-16 15:13 UTCGHSA enrichment
  38. 2026-09-16 14:08 UTCEPSS rescore
  39. 2026-09-16 05:15 UTCEPSS rescore
  40. 2026-09-16 03:15 UTCGHSA enrichment
  41. 2026-09-15 15:19 UTCGHSA enrichment
  42. 2026-09-15 03:16 UTCEG score recompute
  43. 2026-09-15 03:16 UTCGHSA enrichment
  44. 2026-09-15 03:12 UTCEPSS rescore
  45. 2026-09-14 15:20 UTCGHSA enrichment
  46. 2026-09-14 03:23 UTCEG score recompute
  47. 2026-09-14 03:23 UTCGHSA enrichment
  48. 2026-09-13 15:28 UTCGHSA enrichment
  49. 2026-09-13 03:32 UTCGHSA enrichment
  50. 2026-09-12 15:36 UTCEG score recompute
  51. 2026-09-12 15:36 UTCGHSA enrichment
  52. 2026-09-12 15:02 UTCEPSS rescore
  53. 2026-09-12 03:41 UTCGHSA enrichment
  54. 2026-09-11 15:45 UTCEG score recompute
  55. 2026-09-11 15:45 UTCGHSA enrichment
  56. 2026-09-11 14:53 UTCEPSS rescore
  57. 2026-09-11 03:40 UTCGHSA enrichment
  58. 2026-09-10 15:44 UTCEG score recompute
  59. 2026-09-10 15:44 UTCGHSA enrichment
  60. 2026-09-10 09:35 UTCEPSS rescore
  61. 2026-09-10 03:33 UTCGHSA enrichment
  62. 2026-09-09 15:37 UTCGHSA enrichment
  63. 2026-09-09 03:33 UTCEG score recompute
  64. 2026-09-09 03:33 UTCGHSA enrichment
  65. 2026-09-08 22:01 UTCEPSS rescore
  66. 2026-09-08 04:06 UTCGHSA enrichment
  67. 2026-09-07 16:10 UTCEG score recompute
  68. 2026-09-07 16:10 UTCGHSA enrichment
  69. 2026-09-07 00:38 UTCEG score recompute
  70. 2026-09-07 00:38 UTCGHSA enrichment
  71. 2026-09-06 13:48 UTCEPSS rescore
  72. 2026-09-06 12:18 UTCGHSA enrichment
  73. 2026-09-06 00:09 UTCGHSA enrichment
  74. 2026-09-05 12:10 UTCGHSA enrichment
  75. 2026-09-05 00:11 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-74905?
CVE-2026-74905 is a high vulnerability published on August 18, 2026. SiYuan before v3.7.4 contains a server-side request forgery (SSRF) vulnerability in the isPrivateIP function in kernel/util/net.go, used by SSRFSafeDialer to enforce SSRF protection in SafeMode. The function only checks for loopback, link-local unicast, private, and unspecified addresses and does…
When was CVE-2026-74905 disclosed?
CVE-2026-74905 was first published on August 18, 2026, with the most recent update on August 26, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-74905 actively exploited?
CVE-2026-74905 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (26th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-74905?
CVE-2026-74905 has a CVSS base score of 7.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-74905?
A fix for CVE-2026-74905 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-74905 are linked in the Vendor Advisories panel on this page.

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