Vulnerability · Published Aug 21, 2026 · Assigned by VulnCheck

CVE-2026-77086SiYuan before v3.7.4 Path Traversal via packageName

Critical 9.1

In plain English

A critical-severity path traversal in siyuan from siyuan-note. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.0% (higher than 64% of all known vulnerabilities).

Severity (CVSS 3.1)9.1Critical

Exploit odds (30 days)1.0%top 36.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

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 products (as reported)

Vendor	Product	Versions
siyuan-note	siyuan	0 – before 3.7.4

Weakness: CWE-22 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

References

GitHub Security Advisory (GHSA-wr4w-7vjm-mmx3) vendor-advisory
VulnCheck Advisory: SiYuan before v3.7.4 Path Traversal via packageName third-party-advisory