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CVE-2026-85175— SiYuan before v3.8.2 TLS Private Key Disclosure via getFile

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 版本 ≤ 3.8.1（在 v3.8.2 中修复）的 函数（位于 ）存在一个不完整的禁行路径列表。该列表仅通过精确匹配阻止访问 ，但未限制存储在相同 目录下的 TLS 私钥（ ）和 CA 私钥（ ）。由于 处理器会为 角色跳过禁行列表，且在 v3.8.1 中所有经过身份验证的用户均拥有 角色，因此任何用户（或在默认无认证码实例上的任何客户端）都可以通过 获取这些私钥。在启用了 TLS 的部署环境中，攻击者可以利用 解密捕获的 HTTPS 流量，并利用 伪造被导入了 SiYuan CA 的客户端所信任的证

CVSS 8.8 · High

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-2026-85175

Vulnerability Information
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Vulnerability Title
SiYuan before v3.8.2 TLS Private Key Disclosure via getFile
Source: CVE Program / CVE List V5
Vulnerability Description
SiYuan versions <= 3.8.1 (fixed in v3.8.2) contain an incomplete blocklist in the IsForbiddenAbsPath() function (kernel/util/path_guard.go), which only blocks conf/conf.json by exact match and does not restrict the TLS private key (conf/key.pem) or CA private key (conf/ca.key) stored in the same conf/ directory. Because the getFile handler skips the blocklist for RoleAdministrator and all authenticated users receive RoleAdministrator in v3.8.1, any user (or any client on a default no-auth-code instance) can retrieve these private keys via POST /api/file/getFile. On deployments with TLS enabled, this allows decryption of captured HTTPS traffic (key.pem) and forging of certificates trusted by clients that imported SiYuan's CA (ca.key).
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对外部实体的文件或目录可访问
Source: CVE Program / CVE List V5

Affected Products

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

II. Public POCs for CVE-2026-85175

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III. Intelligence Information for CVE-2026-85175

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Vendor Advisories for CVE-2026-85175 (2)

IV. Related Vulnerabilities

Same product: siyuan
Same vendor: siyuan-note
Same weakness: CWE-552

V. Comments for CVE-2026-85175

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