Vulnerability · Published Aug 28, 2026 · Assigned by VulnCheck

CVE-2026-82233SiYuan before v3.8.1 Path Traversal via asset.upload

Medium 5.7

In plain English

A medium-severity path traversal in siyuan from siyuan-note. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 35% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.7Medium

Exploit odds (30 days)0.4%top 65.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

SiYuan before v3.8.1 contains a path traversal vulnerability in the asset.upload MCP tool that accepts arbitrary absolute file paths without workspace boundary validation. Attackers can induce the AI Agent to upload sensitive files such as SSH keys or credentials from outside the workspace into the asset directory through prompt injection.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Go	github.com/siyuan-note/siyuan/kernel	0.0.0-20260813142104-b26a4a307b8a	GHSA-p23f-cm6q-2qp8
Go	github.com/siyuan-note/siyuan/kernel	0.0.0-20260813142104-b26a4a307b8a	GO-2026-6655

Affected products (as reported)

Vendor	Product	Versions
siyuan-note	siyuan	0 – before 3.8.1

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

References

GitHub Security Advisory (GHSA-p23f-cm6q-2qp8) vendor-advisory
VulnCheck Advisory: SiYuan before v3.8.1 Path Traversal via asset.upload third-party-advisory