CVE-2026-85581

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

State: Published
Severity: 8.7 High
Published: Sep 4, 2026
Updated: Sep 10, 2026
Reserved: Sep 4, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
4.0	8.7 High	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N	VulnCheck
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	VulnCheck

Weaknesses

CWE-770 Allocation of Resources Without Limits or Throttling

Affected Products

Product	Versions
siyuansiyuan-note	before 3.8.2Affected 3.8.2Not affected

References

GitHub Security Advisory (GHSA-wv96-wmf5-xvj2)vendor-advisory
VulnCheck Advisory: SiYuan before v3.8.2 Denial of Service via unauthenticated UI-process registrationthird-party-advisory

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.