CVE-2026-27190
📋 TL;DR
This CVE describes a command injection vulnerability in Deno's node:child_process implementation that allows attackers to execute arbitrary commands on the host system. It affects Deno applications using the vulnerable child_process module prior to version 2.6.8. The vulnerability is particularly dangerous in applications that process untrusted input through child_process functions.
💻 Affected Systems
- Deno
📦 What is this software?
Deno by Deno
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with remote code execution, allowing attackers to execute arbitrary commands with the privileges of the Deno process, potentially leading to data theft, system takeover, or lateral movement.
Likely Case
Limited command execution within the Deno process context, potentially allowing file system access, data exfiltration, or further privilege escalation depending on the application's permissions.
If Mitigated
No impact if proper input validation and sanitization are implemented, or if the vulnerable module is not used with untrusted input.
🎯 Exploit Status
Exploitation requires the application to process attacker-controlled input through vulnerable child_process functions. The advisory suggests the vulnerability is in how arguments are passed to child processes.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.6.8
Vendor Advisory: https://github.com/denoland/deno/security/advisories/GHSA-hmh4-3xvx-q5hr
Restart Required: Yes
Instructions:
1. Update Deno to version 2.6.8 or later using: deno upgrade --version 2.6.8
2. Restart all Deno processes and applications
3. Rebuild any applications or services using Deno
🔧 Temporary Workarounds
Avoid node:child_process with untrusted input
allTemporarily avoid using node:child_process functions with any untrusted or user-controlled input until patched.
Implement strict input validation
allAdd rigorous input validation and sanitization for all parameters passed to child_process functions.
🧯 If You Can't Patch
- Implement network segmentation to isolate vulnerable Deno applications from critical systems
- Apply strict input validation and sanitization to all child_process function calls
🔍 How to Verify
Check if Vulnerable:
Check if Deno version is below 2.6.8 and if the application uses node:child_process module.Check Version:
deno --versionVerify Fix Applied:
Verify Deno version is 2.6.8 or higher and test child_process functionality with safe inputs.📡 Detection & Monitoring
Log Indicators:
- Unusual child process executions from Deno applications
- Suspicious command-line arguments in process creation logs
Network Indicators:
- Unexpected outbound connections from Deno processes
- Unusual process spawning patterns
SIEM Query:
process.name:deno AND (process.args:*cmd* OR process.args:*sh* OR process.args:*powershell*)