CVE-2026-85581

HIGH 7.5

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

CVSS Score

7.5

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-770
Vendor	siyuan-note
Product	siyuan
Published	Sep 4, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Affected Versions

siyuan-note / siyuan

0 < 3.8.2

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/siyuan-note/siyuan/security/advisories/GHSA-wv96-wmf5-xvj2 vulncheck.com: https://www.vulncheck.com/advisories/siyuan-before-3.8.2-denial-of-service-via-unauthenticated-ui-process-registration