{"answers":{"affected":"1 open source package ship an affected version, including eslint-config-airbnb-compat.","exploited":"There is no known exploitation of MAL-2025-4339 in the wild and no public exploit code.","fix":"Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.","what":"MAL-2025-4339 is a malicious package in eslint-config-airbnb-compat, published on 17 May 2025."},"fix_prompt":"MAL-2025-4339 is a malicious package: eslint-config-airbnb-compat (npm). Every version was published to cause harm.\n\nTask:\n1. Search this repository's dependency manifests and lockfiles for the package, including transitive dependencies.\n2. If it is present, remove it, regenerate the lockfile with the project's package manager, and replace whatever it was used for.\n3. List any CI runners, developer machines or containers that installed it, so their secrets can be rotated.\n4. If the package is not used anywhere, say so and change nothing.\n\nReference: https://insights.sbomify.com/MAL-2025-4339/ (Markdown: https://insights.sbomify.com/MAL-2025-4339/index.md)","id":"MAL-2025-4339","markdown":"https://insights.sbomify.com/MAL-2025-4339/index.md","name":"MAL-2025-4339","record":{"aliases":["GHSA-x96j-xh9g-x4cf"],"analysis":null,"analysis_generated_by":null,"assigner":null,"cpe":[],"cvss":{"score":null,"severity":null,"source":null,"vector":null,"version":null},"cwes":[],"description":"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:\n\n1. The package uses a seemingly benign `postinstall` script that sets up an environment variable pointing to a malicious domain (`https://proxy.eslint-proxy.site`)\n\n2. It introduces a transitive dependency on another malicious package `ts-runtime-compat-check`\n\n3. The dependency makes HTTP requests to the attacker-controlled server, which returns base64-encoded payloads in error messages\n\n4. These payloads are decoded and executed using `new Function.constructor()`, enabling arbitrary code execution\n\nThis 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.\n\nAny 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.","ecosystems":["npm"],"exploits":{"exploitdb":null,"first_seen":null,"github_poc":null,"max_poc_stars":null,"metasploit":null,"nuclei":null,"refs":[],"tier":null},"has_fix":false,"headline":"Malicious code in eslint-config-airbnb-compat (npm)","id":"MAL-2025-4339","indexable":true,"kev":null,"kind":"malicious","links":{"ecosystem":"npm","product":null,"products":[],"type":null,"year":"2025"},"n_packages":1,"n_references":null,"packages":[{"ecosystem":"npm","fixed":[],"introduced":["0","0.0.0"],"last_affected":[],"package":"eslint-config-airbnb-compat","purl":"pkg:npm/eslint-config-airbnb-compat","source":"MAL-2025-4339"}],"products":null,"published":"2025-05-17","related":[],"sources":[{"class":"attribution","licence":"Apache-2.0","name":"OpenSSF Malicious Packages","prefix":"MAL"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":null,"updated":null,"vendors":null},"summary":null,"url":"https://insights.sbomify.com/MAL-2025-4339/"}