Path Traversal in B3log Siyuan
CVE-2026-33194
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.
Vulnerability class: Path Traversal (Directory Traversal)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.005 (39.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 40th percentile — 39.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: +0.000
Affected products
- B3log Siyuan
- Siyuan-Note Siyuan — versions < 3.6.2
Weakness classification (CWE)
References
- github.com/siyuan-note/siyuan/security/advisories/GHSA-vm69-h85x-8p85 (Exploit, Mitigation, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-33194?
- CVE-2026-33194 is a medium-severity vulnerability in B3log Siyuan, classified under Path Traversal. CVSS score: 6.8/10. Published 2026-03-20.
- How severe is CVE-2026-33194?
- Medium severity. CVSS v3 base score is 6.8 out of 10.