Executive Summary

CVE-2026-27208 is a critical vulnerability in the api-gateway-deploy Docker container version 1.0.0 that involves a combination of OS Command Injection and Privilege Escalation.

The vulnerability exists in the entrypoint.sh script where the sed command uses an environment variable ($INPUT_CORS_DOMAIN) without proper sanitization or secure delimiters. This allows an attacker to inject malicious commands that break out of the intended command context.

Because the container runs as root by default (due to lack of a USER directive in the Dockerfile), the injected commands execute with root privileges inside the container.

This can lead to arbitrary command execution, privilege escalation, and potentially escaping the container to make unauthorized modifications to the underlying infrastructure.

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Impact Analysis

This vulnerability allows an attacker to execute arbitrary commands with root privileges inside the container.

The attacker can escalate privileges and potentially escape the container, leading to unauthorized modifications of the infrastructure hosting the container.

Such unauthorized access can compromise confidentiality, availability, and integrity of the system, as indicated by the CVSS score metrics.

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Compliance Impact

I don't know

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Detection Guidance

[{'type': 'paragraph', 'content': 'This vulnerability can be detected by inspecting the `entrypoint.sh` script in the api-gateway-deploy Docker container version 1.0.0 for unsafe usage of the `sed` command with unsanitized environment variables, specifically the `$INPUT_CORS_DOMAIN` variable.'}, {'type': 'paragraph', 'content': 'A practical detection method is to check if the container is running version 1.0.0 and if the Dockerfile lacks a `USER` directive, which causes the container to run as root.'}, {'type': 'paragraph', 'content': 'Suggested commands to detect the vulnerability include:'}, {'type': 'list_item', 'content': 'Inspect the `entrypoint.sh` script for unsafe `sed` usage: `grep -n "sed -i" entrypoint.sh` and check if `$INPUT_CORS_DOMAIN` is used without sanitization.'}, {'type': 'list_item', 'content': 'Check the Dockerfile for the presence or absence of a `USER` directive: `grep -i USER Dockerfile`.'}, {'type': 'list_item', 'content': "Verify the running container version: `docker inspect --format='{{.Config.Image}}' <container_id>` and compare with version 1.0.0."}, {'type': 'list_item', 'content': 'Scan for suspicious environment variable values that might contain injection payloads, e.g., `docker exec <container_id> env | grep INPUT_CORS_DOMAIN`.'}] [1]

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Mitigation Strategies

The immediate mitigation steps are to upgrade the api-gateway-deploy container to version 1.0.1, which includes fixes for this vulnerability.

Version 1.0.1 implements strict input sanitization and secure delimiters in the `entrypoint.sh` script to prevent command injection.

It also enforces running the container as a non-root user (`appuser`) by adding a `USER` directive in the Dockerfile, reducing privilege escalation risks.

Additionally, mandatory security quality gates using tools like Semgrep, Checkov, Trivy, and Gitleaks have been introduced to prevent similar issues.

Until the upgrade is applied, avoid running the vulnerable container in production and restrict access to the environment variables that could be exploited.

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