CVE-2026-33194: b3log Siyuan

Medium severity, CVSS 6.8. EPSS: 0.5% chance of exploitation in the next 30 days.

SiYuan is a personal knowledge management system. Prior to version 3.6.2, the `IsSensitivePath()` function in `kernel/util/path.go` uses a denylist approach that was recently expanded (GHSA-h5vh-m7fg-w5h6, commit 9914fd1) but remains incomplete. Multiple security-relevant Linux directories are not blocked, including `/opt` (application data), `/usr` (local configs/binaries), `/home` (other users), `/mnt` and `/media` (mounted volumes). The `globalCopyFiles` and `importStdMd` endpoints rely on `IsSensitivePath` as their primary defense against reading files outside the workspace. Version 3.6.2 contains an updated fix.

Affected products

• b3log Siyuan: before 3.6.2 (fixed in 3.6.2)

Published 2026-03-20. Last modified 2026-06-17.