CVE-2026-74799: Siyuan-Note Siyuan

Critical severity, CVSS 9.3. EPSS: 0.5% chance of exploitation in the next 30 days.

SiYuan before 3.7.4 registers Go net/http/pprof debug endpoints including heap and goroutine dumps without authentication when --mode flag is not set to exactly prod. Attackers can access /debug/pprof/heap and related endpoints to extract in-memory secrets including AccessAuthCode and AI provider API keys.

Affected products

• Siyuan-Note Siyuan: before 3.7.4 (fixed in 3.7.4)

Published 2026-08-17. Last modified 2026-08-26.