What is CVE-2026-33669?

CVE-2026-33669 is a critical-severity vulnerability in B3log Siyuan, classified under Out-of-bounds Read. CVSS score: 9.8/10. Published 2026-03-26.

How severe is CVE-2026-33669?

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

Out-of-bounds Read in B3log Siyuan

CVE-2026-33669

SiYuan is a personal knowledge management system. Prior to version 3.6.2, document IDs were retrieved via the /api/file/readDir interface, and then the /api/block/getChildBlocks interface was used to view the content of all documents. Vers…

Vulnerability class: Buffer Overflow

EPSS: 0.005 (40.9th 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-125 — Out-of-bounds Read

References

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

Frequently asked questions

What is CVE-2026-33669?: CVE-2026-33669 is a critical-severity vulnerability in B3log Siyuan, classified under Out-of-bounds Read. CVSS score: 9.8/10. Published 2026-03-26.
How severe is CVE-2026-33669?: Critical severity. CVSS v3 base score is 9.8 out of 10.