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CVE-2026-109309— SiYuan v3.7.0 before v3.8.6 Arbitrary File Read via Plugin ResponseFile.Path

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.

思源笔记（SiYuan）在 v3.7.0 至 v3.8.6 版本之间存在一个绝对路径遍历漏洞，该漏洞位于内核私有插件 HTTP 服务器中。漏洞原因是内核插件处理器中的 ResponseFile.Path 被未经验证地直接传递给 gin 框架的 Context.File 方法。攻击者通过提供恶意内核插件，可以返回一个绝对路径，从而读取 SiYuan 进程有权访问的任何文件，包括 API 令牌和 conf.json 配置文件。

CVSS 6.5 · Medium EPSS 0.38% · P30

Affected Version Matrix 2

VendorProduct Version RangeStatus
siyuan-note siyuan 3.7.0< 3.8.6 affected
3.8.6 unaffected
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I. Basic Information for CVE-2026-109309

Vulnerability Information
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Vulnerability Title
SiYuan v3.7.0 before v3.8.6 Arbitrary File Read via Plugin ResponseFile.Path
Source: CVE Program / CVE List V5
Vulnerability Description
SiYuan v3.7.0 before v3.8.6 contains an absolute path traversal vulnerability in the kernel's private plugin HTTP server, which passes a kernel plugin handler's ResponseFile.Path to gin's Context.File without validation. Attackers supplying a malicious kernel plugin can return an absolute path to read any file readable by the SiYuan process, including the API token and conf.json.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
siyuan-note siyuan 3.7.0 ~ 3.8.6 -

II. Public POCs for CVE-2026-109309

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III. Intelligence Information for CVE-2026-109309

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Patches & Fixes for CVE-2026-109309 (1)

Vendor Advisories for CVE-2026-109309 (1)

Other References for CVE-2026-109309 (1)

IV. Related Vulnerabilities

Same product: siyuan
Same vendor: siyuan-note
Same weakness: CWE-22

V. Comments for CVE-2026-109309

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