---
id: CVE-2026-85175
title: >-
  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/…
summary: >-
  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/…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-552
published: '2026-09-03'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T20:18:59.270'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-85175'
references:
  - url: >-
      https://github.com/siyuan-note/siyuan/security/advisories/GHSA-4wwp-f6gw-6qm5
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/siyuan-before-3.8.2-tls-private-key-disclosure-via-getfile
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/siyuan-note/siyuan/security/advisories/GHSA-4wwp-f6gw-6qm5
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
epss: 0.00188
epssPercentile: 0.08663
ingestedAt: '2026-09-08T21:11:12.291Z'
---

## Overview

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).

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.