Resource exhaustion in Siyuan-Note Siyuan
CVE-2026-85584
SiYuan versions before v3.8.2 contain a denial of service vulnerability in the publish-service Basic Auth throttle that stores failed-attempt state using attacker-controlled usernames without enforcing capacity limits or eviction policies. Unauthenticated attackers can submit repeated authentication requests with unique invalid usernames to exhaust memory and increase synchronization overhead, degrading service availability.
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: 0.006 (47.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 47th percentile — 47.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.006 · change: +0.003
Affected products
Weakness classification (CWE)
References
- github.com/siyuan-note/siyuan/security/advisories/GHSA-2x7j-p79w-7744 (vendor-advisory)
- www.vulncheck.com/advisories/siyuan-before-3.8.2-denial-of-service-via-auth-thr… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-85584?
- CVE-2026-85584 is a high-severity vulnerability in Siyuan-Note Siyuan, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2026-09-04.
- How severe is CVE-2026-85584?
- High severity. CVSS v3 base score is 7.5 out of 10.