CVE-2026-33670 SiYuan has directory traversal within its publishing service

Critical 9.8 Published 26 Mar 2026 Updated 30 Mar 2026

An attacker can traverse directories to read file names in SiYuan notebooks via the readDir API, exposing document structure.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2026-33670?

CVE-2026-33670 is a critical path traversal vulnerability in B3log Siyuan, published on 26 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

SiYuan is a personal knowledge management system. Prior to version 3.6.2, the /api/file/readDir interface was used to traverse and retrieve the file names of all documents under a notebook. Version 3.6.2 patches the issue.

Weakness: CWE-22

Which versions are affected by CVE-2026-33670?

3 open source packages ship an affected version, including github.com/siyuan-note/siyuan/kernel. It affects 1 product.

Package	Affected	Fixed in
`github.com/siyuan-note/siyuan/kernel` Go	All versions	None
`github.com/siyuan-note/siyuan/kernel` Go	All versions to `0.0.0-20260317012524-fe4523fff2c8`	None
`github.com/siyuan-note/siyuan/kernel` Go	All versions to `0.0.0-20260317012524-fe4523fff2c8`	None

Products include B3log Siyuan.

How do I fix CVE-2026-33670?

Upgrade to a fixed version.

Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.

Is CVE-2026-33670 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-33670 exists.

All B3log Siyuan vulnerabilities

Sources

Also known as GHSA-xmw9-6r43-x9ww, GO-2026-4843.