# 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.

Published Jul 25, 2026

[Issue #303](https://github.com/localstack/serverless-localstack/issues/303)

CVSS Score Medium

5.3

### Security Details

**Components Impacted**

**CVE ID**  CVE-2026-16763

**CWE**
- CWE-77 [Learn more about CWE-77](https://cwe.mitre.org/data/definitions/77.html)
- CWE-78 [Learn more about CWE-78](https://cwe.mitre.org/data/definitions/78.html)

**CVE 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.

**Published** Jul 25, 2026

**CVSS Score & Severity**

5.3 Medium

**CVSS Vector**  CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

**EPSS Score** 0.703%

**Malware**  malware

**KEV Status**  Not in KEV Catalog: No known exploits

**Affected Ecosystems**  affected

**Source**  National Vulnerability Database

**References**

[GitHub · Issue #303](https://github.com/localstack/serverless-localstack/issues/303)