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

Quick assessment

Affected
siyuan-note siyuan
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

SiYuan是SiYuan团队开源的一个以隐私为先的个人知识管理系统。 SiYuan 3.8.2之前版本存在资源管理错误漏洞，该漏洞源于publish-service中的Basic Auth节流机制使用攻击者控制的用户名存储失败尝试状态且未实施容量限制或驱逐策略，可能导致未经身份验证的攻击者通过重复提交唯一无效用户名的身份验证请求来耗尽内存并增加同步开销，降低服务可用性。

CVSS 7.5 · High EPSS 0.59% · P48

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 2

VendorProduct Version RangeStatus
siyuan-note siyuan < 3.8.2 affected
3.8.2 unaffected
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I. Basic Information for CVE-2026-85584

Vulnerability Information
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Vulnerability Title
SiYuan before v3.8.2 Denial of Service via Auth Throttle
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
SiYuan 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
SiYuan是SiYuan团队开源的一个以隐私为先的个人知识管理系统。 SiYuan 3.8.2之前版本存在资源管理错误漏洞，该漏洞源于publish-service中的Basic Auth节流机制使用攻击者控制的用户名存储失败尝试状态且未实施容量限制或驱逐策略，可能导致未经身份验证的攻击者通过重复提交唯一无效用户名的身份验证请求来耗尽内存并增加同步开销，降低服务可用性。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
siyuan-note siyuan 0 ~ 3.8.2 -

II. Public POCs for CVE-2026-85584

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III. Intelligence Information for CVE-2026-85584

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Vendor Advisories for CVE-2026-85584 (2)

Same Patch Batch · siyuan-note · 2026-09-04 · 8 CVEs total

CVE-2026-85581 7.5 HIGH SiYuan before v3.8.2 Denial of Service via unauthenticated UI-process registration
CVE-2026-85585 7.5 HIGH SiYuan before v3.8.2 Unbounded Memory Consumption via ControlConcurrency
CVE-2026-85578 6.5 MEDIUM SiYuan through 3.8.1 Authorization Bypass via getFile
CVE-2026-85583 6.5 MEDIUM SiYuan before v3.8.2 Path Traversal via symlink in file API
CVE-2026-85582 6.5 MEDIUM SiYuan before v3.8.2 Unbounded Session Creation via Basic Auth
CVE-2026-85580 6.5 MEDIUM SiYuan before v3.8.2 Path Guard Bypass via Case Mismatch
CVE-2026-85579 4.3 MEDIUM SiYuan before v3.8.2 Information Disclosure via undoState

IV. Related Vulnerabilities

Same product: siyuan
Same vendor: siyuan-note
Same weakness: CWE-770

V. Comments for CVE-2026-85584

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