{"answers":{"affected":"1 open source package ship an affected version, including chai-as-tuned.","exploited":"There is no known exploitation of MAL-2026-4513 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-2026-4513 is a malicious package in chai-as-tuned, published on 21 May 2026."},"fix_prompt":"MAL-2026-4513 is a malicious package: chai-as-tuned (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-2026-4513/ (Markdown: https://insights.sbomify.com/MAL-2026-4513/index.md)","id":"MAL-2026-4513","markdown":"https://insights.sbomify.com/MAL-2026-4513/index.md","name":"MAL-2026-4513","record":{"aliases":["GHSA-2f37-mh3q-7394"],"analysis":null,"analysis_generated_by":null,"assigner":null,"cpe":[],"cvss":{"score":null,"severity":null,"source":null,"vector":null,"version":null},"cwes":[],"description":"Package name `chai-as-tuned` impersonates `chai-as-promised` and ships a README copy-pasted from the unrelated pino project (npm/CI badges point at pinojs/pino). The advertised middleware in `index.js` spawns `lib/initializeCaller.js` as a detached node process whenever the exported function is invoked. That script constructs a fake local `process` object whose `DEV_API_KEY` is a base64 literal decoding to `https://aqua-margit-84.tiiny.site/index.json` (tiiny.site is an anonymous static-hosting service), GETs the JSON via axios, and passes the `response.cookie` field to `new Function.constructor('require', response)(require)` — executing attacker-controlled JavaScript with full Node privileges and access to the host's `require`. The combination of name-confusion, copied README, base64-hidden C2 URL, `Function.constructor` indirection to defeat static review, and remote-fetch-and-eval is an unambiguous supply-chain attack: any consumer who follows the README and uses the main export will execute whatever code the attacker serves at runtime.\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 chai-as-tuned (npm)","id":"MAL-2026-4513","indexable":true,"kev":null,"kind":"malicious","links":{"ecosystem":"npm","product":null,"products":[],"type":null,"year":"2026"},"n_packages":1,"n_references":null,"packages":[{"ecosystem":"npm","fixed":[],"introduced":["0"],"last_affected":[],"package":"chai-as-tuned","purl":"pkg:npm/chai-as-tuned","source":"MAL-2026-4513"}],"products":null,"published":"2026-05-21","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-2026-4513/"}