CVE-2026-85581: Allocation of Resources Without Limits or Throttling in siyuan-note siyuan
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.
CVSS v4.0
Score 8.7high
Affected software
siyuan-note
siyuan
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-85581 is a denial of service vulnerability in SiYuan note-taking software prior to version 3.8.2. The issue exists in the unauthenticated /api/system/uiproc endpoint, which accepts and stores attacker-controlled process identifiers without imposing size limits or requiring authentication. An attacker can repeatedly send requests with unique identifiers to consume process memory resources, leading to service degradation or denial of service.
Potential Impact
An unauthenticated attacker can exploit this vulnerability to exhaust process memory by sending repeated requests with unique process identifiers to the vulnerable endpoint. This can degrade the availability of the SiYuan service, potentially causing denial of service conditions.
Mitigation Recommendations
A fix is available in SiYuan version 3.8.2. Users should upgrade to version 3.8.2 or later to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-09-04T10:56:22.465Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6a9aad9eacd9273b4981d6e9
Added to database: 09/04/2026, 11:38:06 UTC
Last enriched: 09/14/2026, 23:59:41 UTC
Last updated: 10/17/2026, 18:48:23 UTC
Views: 47
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