OS Command Injection in Localstack Serverless-Localstack by Localstack
CVE-2026-16763

4.8MEDIUM

Key Information:

Vendor

Localstack

Status
Serverless-localstack
Vendor
CVE Published:
23 July 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-16763?

A vulnerability exists in Localstack Serverless-Localstack versions up to 1.4.0, specifically within the Configuration Handler's index.js file. This security flaw allows an attacker to manipulate the 'custom.localstack.docker.compose_file' argument, potentially leading to OS command injection. Although the exploit requires local access to the system, it is publicly available, raising concerns about its misuse. Despite early notification to the project, no response has been recorded regarding this issue.

Affected Version(s)

serverless-localstack 1.0

serverless-localstack 1.1

serverless-localstack 1.2

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-16763 - Proof of Concept

References

https://vuldb.com/vuln/382620
vdb-entrytechnical-description
https://vuldb.com/vuln/382620/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-16763
third-party-advisory

CVSS V4

Score:
4.8
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Local
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

wjm2 (VulDB User)
VulDB CNA Team
.