Unbounded Session Creation Vulnerability in SiYuan by SiYuan Note
CVE-2026-85582

7.1HIGH

Key Information:

Vendor

Siyuan-note

Status
Siyuan
Vendor
CVE Published:
4 September 2026

What is CVE-2026-85582?

Versions of SiYuan prior to v3.8.2 are susceptible to an unbounded session creation vulnerability in the publish-service's Basic Auth handler. This security flaw enables authenticated attackers to exploit the system by repetitively authenticating with valid credentials, which results in the creation of persistent session entries. These entries lack expiry or capacity limits, leading to continuous memory growth and potentially causing a denial of service due to resource exhaustion.

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:
7.1
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
.