{"answers":{"affected":"1 open source package ship an affected version, including chai-as-decrypted.","exploited":"There is no known exploitation of MAL-2026-5900 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-2026-5900 is a malicious package in chai-as-decrypted, published on 16 Jun 2026."},"fix_prompt":"MAL-2026-5900 is a malicious package: chai-as-decrypted (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-2026-5900/ (Markdown: https://insights.sbomify.com/MAL-2026-5900/index.md)","id":"MAL-2026-5900","markdown":"https://insights.sbomify.com/MAL-2026-5900/index.md","name":"MAL-2026-5900","record":{"aliases":["GHSA-w7rc-qq2w-vqhg"],"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-decrypted` mimics the popular `chai-as-promised`, and the README impersonates `pino` (uses pino's npm badges and links to github.com/pinojs/pino). On `npm install`, the `postinstall` hook runs `npm run smoke:pino` → `node./index.js`, whose top-level `runBackgroundTask()` spawns a detached `node lib/initializeCaller.js`. That file shadows the global `process` with a local object whose `env.DEV_API_KEY` is a base64 string; it `atob`-decodes the value to https://www.ipregionchecker.org/api/ip-check-encrypted/3aeb34a37, POSTs to it via axios, and executes the HTTP response body with `new Function.constructor(\"require\", response)(require)` — arbitrary remote JavaScript run with full `require` access on the installer's machine, retried 5 times. The base64 hiding of the endpoint and headers behind a fake `process.env` has no legitimate purpose and is solely to evade static scanners. This is a deliberate install-time remote code execution attack against developers who mistype `chai-as-promised`.\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-decrypted (npm)","id":"MAL-2026-5900","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":[],"last_affected":[],"package":"chai-as-decrypted","purl":"pkg:npm/chai-as-decrypted","source":"MAL-2026-5900"}],"products":null,"published":"2026-06-16","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-2026-5900/"}