CVE-2026-45227 Heym < 0.0.21 Sandbox Escape via Python Introspection
Authenticated users can escape the Python sandbox to execute arbitrary host commands and access sensitive backend credentials.
- 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-2026-45227?
CVE-2026-45227 is a high-severity code injection vulnerability in heymrun heym, published on 12 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Heym before 0.0.21 contains a sandbox escape vulnerability in the custom Python tool executor that allows authenticated workflow authors to bypass sandbox restrictions by using object-graph introspection primitives. Attackers can use Python introspection techniques to recover the unrestricted __import__ function, import blocked modules such as os and subprocess, and access inherited backend environment variables containing database credentials and encryption keys to execute arbitrary host commands as the backend service user.
Weakness: CWE-693
Which versions are affected by CVE-2026-45227?
How do I fix CVE-2026-45227?
No fix has been published for CVE-2026-45227 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-2026-45227 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-45227 exists.
Sources
Also known as GHSA-vhhj-j98h-xx8p.