CVE-2026-73041: SiYuan before v3.7.4 Remote Code Execution via PDF Annotations

Severity: critical (CVSS 9.0 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-15 · updated 2026-08-26
Weakness: CWE-79

Description

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.

Affected products

siyuan-note siyuan: before 3.7.4 — fixed in 3.7.4

How to fix

Upgrade to a fixed version: siyuan-note siyuan 3.7.4. Check the vendor advisory for mitigations.

References

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

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