CVE-2026-16763 localstack serverless-localstack Configuration index.js os command injection
Local attackers can execute arbitrary OS commands via the custom.localstack.docker.compose_file configuration argument in the serverless-localstack plugin.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-16763?
CVE-2026-16763 is a medium-severity command injection vulnerability in serverless-localstack, published on 23 Jul 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A vulnerability was identified in localstack serverless-localstack up to 1.4.0. The affected element is an unknown function of the file src/index.js of the component Configuration Handler. The manipulation of the argument custom.localstack.docker.compose_file leads to os command injection. An attack has to be approached locally. The exploit is publicly available and might be used. The project was informed of the problem early through an issue report but has not responded yet.
Which versions are affected by CVE-2026-16763?
How do I fix CVE-2026-16763?
No fix has been published for CVE-2026-16763 yet. Limit exposure of the affected software until one is available.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-16763 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-16763 exists.
Sources
Also known as GHSA-64cc-4fc3-52m3.