CVE-2026-74798

HIGHPre-NVD 8.78.7—
EchelonGraph scoreHIGH 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 — 4 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%CVSS: 8.7Exploit: Elevated riskExposed: 0

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

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
8.7(high)
EG Risk
55(Track*)
EG Risk 55/100SSVC: 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
Severity87% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
0%
EPSS %ILE
30%
KEV
Not listed

Published

August 17, 2026

Last Modified

August 18, 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 22× in last 7d / 22× 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. 2026-08-21 00:28 UTCEG score recompute
  2. 2026-08-21 00:28 UTCGHSA enrichment
  3. 2026-08-20 22:56 UTCEPSS rescore
  4. 2026-08-20 13:05 UTCGHSA enrichment
  5. 2026-08-20 01:32 UTCEG score recompute
  6. 2026-08-20 01:32 UTCGHSA enrichment
  7. 2026-08-19 17:04 UTCEPSS rescore
  8. 2026-08-19 14:08 UTCGHSA enrichment
  9. 2026-08-19 02:45 UTCEG score recompute
  10. 2026-08-19 02:45 UTCGHSA enrichment
  11. 2026-08-18 15:18 UTCEG score recompute
  12. 2026-08-18 15:18 UTCGHSA enrichment
  13. 2026-08-18 14:51 UTCEG score recompute
  14. 2026-08-18 14:51 UTCGHSA enrichment
  15. 2026-08-18 13:49 UTCEPSS rescore
  16. 2026-08-18 13:49 UTCEPSS rescore
  17. 2026-08-18 10:30 UTCGHSA enrichment
  18. 2026-08-17 23:06 UTCEG score recompute
  19. 2026-08-17 23:06 UTCGHSA enrichment
  20. 2026-08-17 11:42 UTCEG score recompute
  21. 2026-08-17 11:13 UTCEG score recompute
  22. 2026-08-17 11:12 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

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 in the National Vulnerability Database on August 17, 2026, with the most recent update on August 18, 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% probability of exploitation in the next 30 days, which ranks it in the top 70.2% of all scored CVEs.
What is the CVSS score of CVE-2026-74798?
CVE-2026-74798 has a CVSS v3 base score of 8.7 (NVD).
How do I remediate CVE-2026-74798?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-74798, 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

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