Resource exhaustion in Siyuan-Note Siyuan
CVE-2026-85582
SiYuan versions before v3.8.2 contain an unbounded session creation vulnerability in the publish-service Basic Auth handler that allows authenticated attackers to exhaust memory. Attackers can repeatedly authenticate with valid credentials to create persistent session entries without expiry or capacity limits, causing indefinite process memory growth and denial of service.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.004 (36.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 36th percentile — 36.5% 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: 0.004 · change: +0.001
Affected products
Weakness classification (CWE)
References
- github.com/siyuan-note/siyuan/security/advisories/GHSA-f4vj-ppp2-5hg4 (vendor-advisory)
- www.vulncheck.com/advisories/siyuan-before-3.8.2-unbounded-session-creation-via… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-85582?
- CVE-2026-85582 is a medium-severity vulnerability in Siyuan-Note Siyuan, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 6.5/10. Published 2026-09-04.
- How severe is CVE-2026-85582?
- Medium severity. CVSS v3 base score is 6.5 out of 10.