RCE in Localstack Serverless-Localstack
CVE-2026-16763
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.
Vulnerability class: Command Injection (OS Command Injection)
EPSS: 0.012 (66.8th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.
Affected products
- Localstack Serverless-localstack — versions 1.0, 1.1, 1.2
Weakness classification (CWE)
References
- cna@vuldb.com (technical-description, vdb-entry)
- cna@vuldb.com (signature, permissions-required)
- cna@vuldb.com (third-party-advisory)
- cna@vuldb.com (third-party-advisory)
- cna@vuldb.com (issue-tracking, exploit)
- cna@vuldb.com (product)
Frequently asked questions
- What is CVE-2026-16763?
- CVE-2026-16763 is a medium-severity vulnerability in Localstack Serverless-Localstack, classified under Command Injection. CVSS score: 5.3/10. Published 2026-07-23.
- How severe is CVE-2026-16763?
- Medium severity. CVSS v3 base score is 5.3 out of 10.