The npm package eslint-config-airbnb-compat
is a malicious package impersonating the legitimate Airbnb ESLint configuration. It implements a multi-stage remote code execution attack:
The package uses a seemingly benign postinstall
script that sets up an environment variable pointing to a malicious domain (https://proxy.eslint-proxy.site
)
It introduces a transitive dependency on another malicious package ts-runtime-compat-check
The dependency makes HTTP requests to the attacker-controlled server, which returns base64-encoded payloads in error messages
These payloads are decoded and executed using new Function.constructor()
, enabling arbitrary code execution
This supply chain attack is designed to execute attacker-controlled code while masquerading as a legitimate package from Airbnb, likely targeting both direct users and automated security tools through typosquatting.
-= Per source details. Do not edit below this line.=-
Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.
{ "malicious-packages-origins": [ { "modified_time": "2025-05-23T02:24:01Z", "source": "ghsa-malware", "sha256": "4b39d8f82da80dcc8ff8c3fbe7253d1d6a1b46957193451be9c46a990cb25cb8", "id": "GHSA-x96j-xh9g-x4cf", "import_time": "2025-05-24T00:36:06.462792789Z", "ranges": [ { "events": [ { "introduced": "0" } ], "type": "SEMVER" } ] } ] }