---
id: CVE-2026-77086
title: SiYuan before v3.7.4 Path Traversal via packageName
summary: >-
  SiYuan before v3.7.4 fails to validate the packageName parameter in Bazaar
  install and uninstall endpoints, allowing authenticated administrators to
  perform path traversal via directory traversal sequences. Attackers with admin
  access ca…
severity: critical
cvss: 9.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-22
vendor: siyuan-note
product: siyuan
affected:
  - siyuan < 3.7.4
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-08-21T11:45:56.651260Z'
published: '2026-08-21'
updated: '2026-10-01'
sourceUpdated: '2026-10-01T15:21:13.113Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-77086'
references:
  - url: >-
      https://github.com/siyuan-note/siyuan/security/advisories/GHSA-wr4w-7vjm-mmx3
    label: GitHub Security Advisory (GHSA-wr4w-7vjm-mmx3)
  - url: >-
      https://www.vulncheck.com/advisories/siyuan-before-path-traversal-via-packagename
    label: 'VulnCheck Advisory: SiYuan before v3.7.4 Path Traversal via packageName'
tags:
  - cve.org
epss: 0.01028
epssPercentile: 0.62345
ingestedAt: '2026-10-01T15:48:17.846Z'
---

## Overview

SiYuan before v3.7.4 fails to validate the packageName parameter in Bazaar install and uninstall endpoints, allowing authenticated administrators to perform path traversal via directory traversal sequences. Attackers with admin access can write arbitrary files to any location via install operations or recursively delete directories via uninstall operations by supplying crafted packageName values.

## Affected

- `siyuan < 3.7.4`

## Remediation

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