CVE-2026-109310: SiYuan v3.1.12 before v3.8.6 Denial of Service via getDynamicIcon Template

Severity: medium (CVSS 6.5 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: 2026-10-12 · updated 2026-10-13
Weakness: CWE-770

Description

SiYuan v3.1.12 before v3.8.6 fails to restrict the Sprig template function map in the /api/icon/getDynamicIcon content parameter, allowing resource exhaustion. A publish reader, or anyone when publish auth is disabled, can use uncapped functions like until to OOM-kill the kernel with one request.

Affected products

siyuan-note siyuan: from 3.1.12 before 3.8.6 — fixed in 3.8.6

How to fix

Upgrade to a fixed version: siyuan-note siyuan 3.8.6. Check the vendor advisory for mitigations.

References

https://github.com/siyuan-note/siyuan/security/advisories/GHSA-cxwr-r7cq-xw52
https://www.vulncheck.com/advisories/siyuan-3.1.12-before-3.8.6-denial-of-service-via-getdynamicicon-template
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-cxwr-r7cq-xw52

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