CVE-2026-74798

HIGHPre-NVD 8.78.7—
EchelonGraph scoreMEDIUM confidence

Score 8.7 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-17. A secondary CVSS source baseline 8.7; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
8.7EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 8.7Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

SiYuan kernel before v3.7.4 contains a path traversal vulnerability in the database_clean MCP tool. The tool performs only an empty-string check on the id parameter before passing it to RemoveUnusedAttributeView (kernel/model/attribute_view.go), which builds a filesystem path via filepath.Join without validating that id matches SiYuan's node-ID format. An authenticated MCP client can supply path traversal sequences in id to cause the kernel to copy an arbitrary file readable by the process into SiYuan's history directory (arbitrary file read) and then delete the original file (arbitrary file deletion). The corresponding HTTP API handler was hardened in GHSA-7hm9-v7vf-7g4w, but this MCP caller was not.

CVSS v3
8.7
EG Score
8.7HIGHmedium confidence
EG Risk
55
EG Risk 55/100CISA 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
Severity87% × 45%
Exploitation40% × 40%
Automatability0% × 15%
CISA SSVC: Track at low, Track* at medium and Attend at high mission impact.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.5%
EPSS %ILE
41st
KEV
Not listed

CISA SSVCTrack at low, Track* at medium and Attend at high mission impact.

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (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 17, 2026

Last Modified

August 26, 2026

Advisory Details (2)

Auto-updated Aug 17, 2026
🔬 Proof of concept available. Patch available. Sources: github.
generic

SiYuan kernel Path Traversal via database_clean MCP tool | Advisories | VulnCheck

https://www.vulncheck.com/advisories/siyuan-kernel-path-traversal-via-database-clean-mcp-tool
github Patch Available🟡 PoC Available

Path Traversal in MCP tool database_clean (RemoveUnusedAttributeView) leads to Arbitrary File Read (via history copy) and Arbitrary File Deletion, missed by the recent GHSA-7hm9-v7vf-7g4w fix · Advisory · siyuan-note/siyuan · GitHub

https://github.com/siyuan-note/siyuan/security/advisories/GHSA-43jx-gxq4-jpjc

Vendor Advisories for CVE-2026-74798(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 / 107× 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 189 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-74798?
CVE-2026-74798 is a high vulnerability published on August 17, 2026. SiYuan kernel before v3.7.4 contains a path traversal vulnerability in the databaseclean MCP tool. The tool performs only an empty-string check on the id parameter before passing it to RemoveUnusedAttributeView (kernel/model/attributeview.go), which builds a filesystem path via filepath.Join…
When was CVE-2026-74798 disclosed?
CVE-2026-74798 was first published on August 17, 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-2026-74798 actively exploited?
CVE-2026-74798 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (41st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-74798?
CVE-2026-74798 has a CVSS base score of 8.7 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-74798?
A fix for CVE-2026-74798 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-74798 are linked in the Vendor Advisories panel on this page.

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