Unbounded Resource Consumption Vulnerability in SiYuan by SiYuan Note
CVE-2026-85585

8.7HIGH

Key Information:

Vendor

Siyuan-note

Status
Siyuan
Vendor
CVE Published:
4 September 2026

What is CVE-2026-85585?

SiYuan versions prior to v3.8.2 are susceptible to an unbounded resource consumption vulnerability affecting the request-concurrency middleware. This flaw allows unauthenticated attackers to exploit the system by sending numerous unique request paths. As these entries accumulate without eviction, they lead to increased process memory usage and synchronization overhead, ultimately degrading the availability of the service.

Affected Version(s)

siyuan 0 < 3.8.2

siyuan 3.8.2

References

https://github.com/siyuan-note/siyuan/security/advisories...
vendor-advisory
https://www.vulncheck.com/advisories/siyuan-before-3.8.2-...
third-party-advisory

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

alham-rizvi
.