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CVE-2026-85585— SiYuan before v3.8.2 Unbounded Memory Consumption via ControlConcurrency

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，该漏洞源于请求并发中间件对资源消耗不受限制，为每个唯一请求路径保留互斥锁条目且不淘汰，可能导致未经身份验证的攻击者发送大量唯一请求路径，永久增加进程内存和同步开销，降低可用性。

CVSS 7.5 · High EPSS 0.51% · P43

Possible ATT&CK Techniques 1 AI

T1499.001 · OS Exhaustion Flood

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-2026-85585

Vulnerability Information
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Vulnerability Title
SiYuan before v3.8.2 Unbounded Memory Consumption via ControlConcurrency
Source: CVE Program / CVE List V5
Vulnerability Description
SiYuan before v3.8.2 contains an unbounded resource consumption vulnerability in the request-concurrency middleware that retains mutex entries for every unique request path without eviction. Unauthenticated attackers can send numerous unique request paths to permanently increase process memory and synchronization overhead, degrading 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
未加控制的资源消耗(资源穷尽)
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，该漏洞源于请求并发中间件对资源消耗不受限制，为每个唯一请求路径保留互斥锁条目且不淘汰，可能导致未经身份验证的攻击者发送大量唯一请求路径，永久增加进程内存和同步开销，降低可用性。
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-2026-85585

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III. Intelligence Information for CVE-2026-85585

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Vendor Advisories for CVE-2026-85585 (2)

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

CVE-2026-85584 7.5 HIGH SiYuan before v3.8.2 Denial of Service via Auth Throttle
CVE-2026-85581 7.5 HIGH SiYuan before v3.8.2 Denial of Service via unauthenticated UI-process registration
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-400

V. Comments for CVE-2026-85585

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