CVE-2026-73041

CRITICAL 9.0

SiYuan before v3.7.4 Remote Code Execution via PDF Annotations

CVSS Score

9.0

EPSS Score

0.0%

EPSS Percentile

0th

SiYuan versions before v3.7.4 fail to validate or escape annotation fields written to disk by the setFileAnnotation endpoint. Attackers can inject malicious markup into annotation fields that execute as script in the PDF renderer with full Node.js access when a user opens an annotated PDF.

CWE	CWE-79
Vendor	siyuan-note
Product	siyuan
Published	Aug 15, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

siyuan-note / siyuan

0 < 3.7.4

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/siyuan-note/siyuan/security/advisories/GHSA-fqpw-c3pj-w8g9 vulncheck.com: https://www.vulncheck.com/advisories/siyuan-before-remote-code-execution-via-pdf-annotations

Credits

🔍 Shirshakhtml