Dependency Confusion Attacks: Exploiting Package Name Trust in Software Development

Dependency confusion is a software supply chain attack in which threat actors publish malicious packages to public repositories with the same or similar names as internal private dependencies used by organisations.

Recent security research and documented incidents have shown that organisations with weak dependency controls can unknowingly execute attacker-controlled code during build processes. This can lead to the complete compromise of CI/CD pipelines, the theft of secrets, and the insertion of malicious code into production software.

How It Works

Attackers first identify internal package names used by an organisation (often through leaked build logs, open-source projects, or error messages). They then publish a malicious package with the same name to public repositories such as npm or PyPI.

If the organisation’s build system is misconfigured to prefer public repositories or does not properly lock dependencies, it downloads and executes the attacker’s version. Once executed, the malicious package can steal environment variables, API keys, cloud credentials, and CI/CD secrets, or modify the build output to include backdoors.

How to Protect Your Organisation

1. Use Private Package Registries: Ensure internal dependencies are stored in controlled registries and properly scoped to prevent external overrides.

2. Enforce Dependency Pinning: Lock all dependencies to specific versions and verify integrity using hashes or lockfiles.

3. Configure Registry Priority Properly: Set build systems to always prefer internal repositories over public ones.

4. Scan and Monitor Dependencies: Use software composition analysis (SCA) tools to detect suspicious or unexpected package sources and changes.

5. Limit CI/CD Secret Exposure: Avoid exposing sensitive environment variables during build processes and use secure secret injection mechanisms.

6. Developer Awareness: Train engineering teams on supply chain risks, especially around package naming, open-source usage, and build pipeline security.