# CVE-2026-85584

## Summary

- **CVE ID:** CVE-2026-85584
- **Severity:** HIGH
- **CVSS Score:** 8.7 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N)
- **CWE:** CWE-770
- **Published:** Sep 4, 2026
- **Last Modified:** Sep 8, 2026

## 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 (0)
- siyuan-note — siyuan (3.8.2)

## References

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

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.33%
- **EPSS Percentile:** 25.6

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._