Resource exhaustion in Siyuan-Note Siyuan
CVE-2026-85585
SiYuan before v3.8.2 contains an unbounded resource consumption vulnerability in the request-concurrency middleware that retains mutex entries for every unique request path without eviction. Unauthenticated attackers can send numerous unique request paths to permanently increase process memory and synchronization overhead, degrading availability.
Vulnerability class: DoS (Denial of Service)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.005 (42.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 42nd percentile — 42.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.005 · change: +0.001
Affected products
Weakness classification (CWE)
References
- github.com/siyuan-note/siyuan/security/advisories/GHSA-p59v-3q54-qq55 (vendor-advisory)
- www.vulncheck.com/advisories/siyuan-before-3.8.2-unbounded-memory-consumption-v… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-85585?
- CVE-2026-85585 is a high-severity vulnerability in Siyuan-Note Siyuan, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2026-09-04.
- How severe is CVE-2026-85585?
- High severity. CVSS v3 base score is 7.5 out of 10.