What is CVE-2026-33670?

CVE-2026-33670 is a critical-severity vulnerability in B3log Siyuan, classified under Path Traversal. CVSS score: 9.8/10. Published 2026-03-26.

How severe is CVE-2026-33670?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Path Traversal in B3log Siyuan

CVE-2026-33670

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.

Vulnerability class: Path Traversal (Directory Traversal)

EPSS: 0.007 (47.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

B3log Siyuan
Siyuan-note Siyuan — versions < 3.6.2

Weakness classification (CWE)

CWE-22 — Path Traversal

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)

Frequently asked questions

What is CVE-2026-33670?: CVE-2026-33670 is a critical-severity vulnerability in B3log Siyuan, classified under Path Traversal. CVSS score: 9.8/10. Published 2026-03-26.
How severe is CVE-2026-33670?: Critical severity. CVSS v3 base score is 9.8 out of 10.