CVE-2026-85582: Siyuan-Note Siyuan

Medium severity, CVSS 6.5. EPSS: 0.4% chance of exploitation in the next 30 days.

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.

Affected products

• Siyuan-Note Siyuan: before 3.8.2 (fixed in 3.8.2)

Published 2026-09-04. Last modified 2026-09-08.