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CVE-2026-33669

B3log Siyuan out-of-bounds read

9.8 CRITICALPublic exploitEPSS 0.52%
  1. Published26 Mar 2026

Description

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. Version 3.6.2 patches the issue.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

B3log Siyuan< 3.6.2

Remediation

Fixed in
B3log Siyuan≥ 3.6.2

References

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Frequently asked

Is CVE-2026-33669 being actively exploited?

CVE-2026-33669 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.52%.

How severe is CVE-2026-33669?

CVE-2026-33669 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.52% probability of exploitation.

Which products are affected by CVE-2026-33669?

Affected products include B3log Siyuan.

How do I fix CVE-2026-33669?

Upgrade affected software to a fixed version, for example B3log Siyuan 3.6.2 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-33669 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.