CVE-2026-85581

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-09-04. a secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: None knownExposed: 0

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

SiYuan before v3.8.2 contains a denial of service vulnerability in the unauthenticated /api/system/uiproc endpoint that accepts and retains attacker-controlled process identifiers without size limits or authentication. Attackers can send repeated requests with unique identifiers to exhaust process memory and degrade service availability.

CVSS v3
7.5
EG Score
7.5(high)
EG Risk
49(Track)
EG Risk 49/100SSVC: 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
Severity75% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
25%
KEV
Not listed

Published

September 4, 2026

Last Modified

September 10, 2026

Advisory Details (2)

Auto-updated Sep 4, 2026
🔬 Proof of concept available. Patch available. Sources: github.
generic

SiYuan before v3.8.2 Denial of Service via unauthenticated UI-process registration | Advisories | VulnCheck

https://www.vulncheck.com/advisories/siyuan-before-3.8.2-denial-of-service-via-unauthenticated-ui-process-registration
github Patch Available🟡 PoC Available

Unauthenticated UI-process registration retains attacker-controlled identifiers without bound · Advisory · siyuan-note/siyuan · GitHub

https://github.com/siyuan-note/siyuan/security/advisories/GHSA-wv96-wmf5-xvj2

Vendor Advisories for CVE-2026-85581(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 27× in last 7d / 66× 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 20:16 UTCEPSS rescore
  2. 2026-09-20 19:43 UTCGHSA enrichment
  3. 2026-09-20 08:09 UTCGHSA enrichment
  4. 2026-09-19 20:34 UTCEG score recompute
  5. 2026-09-19 20:34 UTCGHSA enrichment
  6. 2026-09-19 09:00 UTCGHSA enrichment
  7. 2026-09-18 21:23 UTCEG score recompute
  8. 2026-09-18 21:23 UTCGHSA enrichment
  9. 2026-09-18 19:28 UTCEPSS rescore
  10. 2026-09-18 09:44 UTCGHSA enrichment
  11. 2026-09-17 22:10 UTCEG score recompute
  12. 2026-09-17 22:10 UTCGHSA enrichment
  13. 2026-09-17 19:32 UTCEPSS rescore
  14. 2026-09-17 10:36 UTCGHSA enrichment
  15. 2026-09-16 23:01 UTCEG score recompute
  16. 2026-09-16 23:01 UTCGHSA enrichment
  17. 2026-09-16 14:09 UTCEPSS rescore
  18. 2026-09-16 11:27 UTCEG score recompute
  19. 2026-09-16 11:27 UTCGHSA enrichment
  20. 2026-09-16 05:15 UTCEPSS rescore
  21. 2026-09-15 23:50 UTCGHSA enrichment
  22. 2026-09-15 12:16 UTCEG score recompute
  23. 2026-09-15 12:16 UTCGHSA enrichment
  24. 2026-09-15 03:12 UTCEPSS rescore
  25. 2026-09-15 03:12 UTCEPSS rescore
Show 41 more
  1. 2026-09-15 00:42 UTCGHSA enrichment
  2. 2026-09-14 13:08 UTCGHSA enrichment
  3. 2026-09-14 01:34 UTCEG score recompute
  4. 2026-09-14 01:34 UTCGHSA enrichment
  5. 2026-09-13 14:00 UTCGHSA enrichment
  6. 2026-09-13 02:26 UTCEG score recompute
  7. 2026-09-13 02:26 UTCGHSA enrichment
  8. 2026-09-12 14:52 UTCGHSA enrichment
  9. 2026-09-12 03:18 UTCGHSA enrichment
  10. 2026-09-11 15:43 UTCEG score recompute
  11. 2026-09-11 15:43 UTCGHSA enrichment
  12. 2026-09-11 14:53 UTCEPSS rescore
  13. 2026-09-11 14:53 UTCEPSS rescore
  14. 2026-09-11 04:01 UTCGHSA enrichment
  15. 2026-09-10 16:26 UTCEG score recompute
  16. 2026-09-10 16:26 UTCGHSA enrichment
  17. 2026-09-10 15:28 UTCEG score recompute
  18. 2026-09-10 15:28 UTCGHSA enrichment
  19. 2026-09-10 07:02 UTCGHSA enrichment
  20. 2026-09-09 19:28 UTCGHSA enrichment
  21. 2026-09-09 07:53 UTCEG score recompute
  22. 2026-09-09 07:53 UTCGHSA enrichment
  23. 2026-09-08 22:01 UTCEPSS rescore
  24. 2026-09-08 20:19 UTCGHSA enrichment
  25. 2026-09-08 09:58 UTCGHSA enrichment
  26. 2026-09-07 21:22 UTCEG score recompute
  27. 2026-09-07 21:22 UTCGHSA enrichment
  28. 2026-09-07 09:48 UTCGHSA enrichment
  29. 2026-09-06 22:13 UTCEG score recompute
  30. 2026-09-06 22:13 UTCGHSA enrichment
  31. 2026-09-06 13:48 UTCEPSS rescore
  32. 2026-09-06 10:38 UTCGHSA enrichment
  33. 2026-09-05 23:04 UTCEG score recompute
  34. 2026-09-05 23:04 UTCGHSA enrichment
  35. 2026-09-05 15:31 UTCEPSS rescore
  36. 2026-09-05 11:30 UTCGHSA enrichment
  37. 2026-09-04 23:56 UTCEG score recompute
  38. 2026-09-04 23:56 UTCGHSA enrichment
  39. 2026-09-04 12:22 UTCEG score recompute
  40. 2026-09-04 11:34 UTCEG score recompute
  41. 2026-09-04 11:33 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-85581?
CVE-2026-85581 is a high vulnerability published on September 4, 2026. SiYuan before v3.8.2 contains a denial of service vulnerability in the unauthenticated /api/system/uiproc endpoint that accepts and retains attacker-controlled process identifiers without size limits or authentication. Attackers can send repeated requests with unique identifiers to exhaust process…
When was CVE-2026-85581 disclosed?
CVE-2026-85581 was first published in the National Vulnerability Database on September 4, 2026, with the most recent update on September 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-85581 actively exploited?
CVE-2026-85581 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 75.1% of all scored CVEs.
What is the CVSS score of CVE-2026-85581?
CVE-2026-85581 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-85581?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-85581, 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-2026-85581

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