CVE-2026-100865 Heym before 0.0.53 Remote Code Execution via eval() Sandbox Escape
Authenticated users can execute arbitrary code via malicious workflow conditions due to insufficient sandboxing in Heym.
- 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-2026-100865?
CVE-2026-100865 is a high-severity code injection vulnerability in heymrun heym, published on 27 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Heym before 0.0.53 evaluates workflow condition expressions using Python's eval() with insufficient sandboxing in the workflow executor service. Authenticated users can edit workflow condition nodes or import malicious templates to execute arbitrary Python and OS commands as the backend process user.
Weakness: CWE-94
Which versions are affected by CVE-2026-100865?
How do I fix CVE-2026-100865?
No fix has been published for CVE-2026-100865 yet. Limit exposure of the affected software until one is available.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-100865 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-100865 exists.
Sources
Also known as GHSA-grmf-qq9c-vgpp.