External risk intelligence

dbt Actions Shell Command Injection.

CVE advisorySeverity: CRITICAL (CVSS 9.3)

CVE-2026-39382

The vulnerability exists within a CI/CD workflow automation script used for processing GitHub issue comments. This is a build-time, developer-centric tool used for repository maintenance and automation, rather than an internet-facing application, service, or gateway.

OS Command Injection

Halo Surface Signal: 1 out of 5 — much less likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

A vulnerability was identified in a data transformation tool's workflow automation, specifically how it processes comments within a code repository. This could allow an attacker to inject commands into the system if they can influence comment content, potentially impacting automated processes. The main concern is confirming if this specific automation workflow is in use and exposed.

Issue: Commands injected via comment content.
Remember: Affects automated workflow actions.
Takeaway: Confirm if this automation tool is used.

Attack Path

How an attacker could exploit the issue

An attacker could potentially inject malicious commands by controlling the content of a GitHub issue comment within a dbt workflow. This occurs because the workflow script directly interpolates the comment's body into a bash command without proper sanitization, allowing for code execution. This could lead to the execution of arbitrary commands on the system running the workflow.

No authentication required to trigger.
Malicious comment body in GitHub issue.
Arbitrary command execution risk.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability could allow an attacker to inject arbitrary commands into the bash shell when processing GitHub issue comments. This occurs because user-supplied comment text is directly interpolated into a shell command without proper escaping, enabling command injection when a malicious comment is present.

Shell commands on the server.
Attacker controls comment content.
Arbitrary command execution.

Operational Fix

Recommended remediation, mitigation, and detection steps

This vulnerability resides within dbt's GitHub Actions workflow for managing issue comments. The primary responsibility for addressing this likely falls to the platform or DevOps team managing the CI/CD pipelines and GitHub repository, in coordination with the application owners who use dbt for data transformation. The first practical step is to identify all instances where this specific GitHub Action workflow is utilized, assess the criticality of the affected repositories and the potential for malicious comment injection, and then plan for remediation.

Platform or DevOps team owns the fix.
Verify all repository workflows using the action.
Update the workflow to the fixed version.

Supplementary metadata

CVSS vector

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Frequently asked questions

What is dbt and how is it used?

dbt is a development framework used by data analysts and engineers to transform data. It applies software engineering best practices to data workflows, such as modularity and version control. While dbt itself handles data logic, this vulnerability involves a specific GitHub Actions workflow automation script used by dbt-labs to manage repository issue tracking.

What is the CVE-2026-39382 vulnerability?

This is a command injection vulnerability, classified as CWE-78. It occurs when a computer program takes input from a user and mistakenly runs it as a system command. In this case, the dbt automation script processes text from GitHub issue comments and passes that text directly into a bash shell. If the comment contains specially crafted characters, the shell may execute them as instructions instead of treating them as plain text.

How does an attacker trigger this CVE-2026-39382 flaw?

An attacker triggers this by creating a GitHub issue comment containing malicious shell syntax. The workflow script will fail to sanitize this input, allowing the code to escape its intended boundary and run unauthorized commands. Note that standard repository activity that does not involve the specific automation logic within the open-issue-in-repo.yml file is not affected by this injection path.

Is my dbt setup at risk according to Halo Surface Signal?

Halo Surface Signal indicates this is unlikely to impact typical internet-facing web applications. Because the flaw exists within a CI/CD build-time tool designed for internal repository maintenance, it is primarily a developer-centric concern rather than an externally accessible web service gateway.

What should I do if I use dbt workflows?

First, locate every repository using the dbt-labs automation workflow that processes issue comments. Review your team's CI/CD configurations to confirm if this specific automation script is active. Once identified, apply the official fix provided by the vendor to ensure all comment inputs are properly sanitized before they reach the shell.

References

Written by Nicholas Merritt

Nicholas Merritt is VP of Security Solutions at Halo Security. With more than 25 years across application security, vulnerability prioritization, and offensive security, he helps teams translate threat data into practical exposure validation and remediation focus. He authors Halo Threat Intelligence CVE advisories using Halo Surface Signal and H/A/L/O context to prioritize internet-facing risk.