CVE-2026-74799: SiYuan before 3.7.4 Unauthenticated Debug Endpoint Information Disclosure

Severity: critical (CVSS 9.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-17 · updated 2026-08-26
Weakness: CWE-215

Description

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

How to fix

Upgrade to a fixed version: siyuan-note siyuan 3.7.4. Check the vendor advisory for mitigations.

References

https://github.com/siyuan-note/siyuan/security/advisories/GHSA-9cqq-p2hw-mj3f
https://www.vulncheck.com/advisories/siyuan-before-unauthenticated-debug-endpoint-information-disclosure
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-9cqq-p2hw-mj3f

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