CVE-2026-109310 SiYuan v3.1.12 before v3.8.6 Denial of Service via getDynamicIcon Template
Attackers can cause denial of service via resource exhaustion in SiYuan's dynamic icon API, affecting all users unless patched.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-109310?
CVE-2026-109310 is a high-severity denial of service vulnerability in siyuan-note siyuan, published on 12 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-770
Which versions are affected by CVE-2026-109310?
How do I fix CVE-2026-109310?
No fix has been published for CVE-2026-109310 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-109310 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-109310 exists.
Sources
Also known as GHSA-cxwr-r7cq-xw52, GHSA-q79h-f459-w43f.