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

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HIGH

SiYuan before v3.8.2 Denial of Service via Auth Throttle

Published Sep 4, 2026

8.7

HIGH

CVSS 4.0

EPSS 0.59%

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

Vendor Siyuan-Note Product Siyuan Default
unaffected
- Version
  0
  Status
  affected
  Constraints
  <3.8.2
- Version
  3.8.2
  Status
  unaffected
  Constraints
  -

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

Siyuan-Note

Siyuan

unaffected

Version	Status	Constraints
0	affected	<3.8.2
3.8.2	unaffected	-

Remediation

No remediation recorded yet.

Weaknesses (1)

CWE-770

Allocation of Resources Without Limits

References (3)

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-71007
Advisory
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-2x7j-p79w-7744
exploitvendor-advisory
https://www.vulncheck.com/advisories/siyuan-before-3.8.2-denial-of-service-via-auth-throttle
third-party-advisory

Link	Providers	Tags
https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-71007		Advisory
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-2x7j-p79w-7744		exploitvendor-advisory
https://www.vulncheck.com/advisories/siyuan-before-3.8.2-denial-of-service-via-auth-throttle		third-party-advisory