What’s Vulnerable › Vulnerabilities

CVE-2026-85584: SiYuan before v3.8.2 Denial of Service via Auth Throttle

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-04 · updated 2026-09-08
• Weakness: CWE-770

Description

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.

Affected products

• siyuan-note siyuan: before 3.8.2 — fixed in 3.8.2

How to fix

Upgrade to a fixed version: siyuan-note siyuan 3.8.2. Check the vendor advisory for mitigations.

References

• https://github.com/siyuan-note/siyuan/security/advisories/GHSA-2x7j-p79w-7744
• https://www.vulncheck.com/advisories/siyuan-before-3.8.2-denial-of-service-via-auth-throttle
• https://github.com/siyuan-note/siyuan/security/advisories/GHSA-2x7j-p79w-7744

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