{"answers":{"affected":"1 open source package ship an affected version, including chai-plugin-kit.","exploited":"There is no known exploitation of MAL-2026-5906 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-2026-5906 is a malicious package in chai-plugin-kit, published on 16 Jun 2026."},"fix_prompt":"MAL-2026-5906 is a malicious package: chai-plugin-kit (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-2026-5906/ (Markdown: https://insights.sbomify.com/MAL-2026-5906/index.md)","id":"MAL-2026-5906","markdown":"https://insights.sbomify.com/MAL-2026-5906/index.md","name":"MAL-2026-5906","record":{"aliases":[],"analysis":null,"analysis_generated_by":null,"assigner":null,"cpe":[],"cvss":{"score":null,"severity":null,"source":null,"vector":null,"version":null},"cwes":[],"description":"Package republishes the chai source tree under the confusable name `chai-plugin-kit`. The package's main entry (`index.js`) spawns a detached, stdio-silenced `node` subprocess running `lib/chai/utils/addAssertion.js` on every `require('chai-plugin-kit')`. That file is heavily obfuscated with obfuscator.io transforms (rotated 31-entry string array `_0x4a30`, custom base64 decoder `_0x495d`, hex-named identifiers, control-flow flattening) hiding an https GET to an attacker-controlled URL whose response body is passed to `new Function('require', body)` and immediately invoked with the real `require` — granting attacker-controlled JavaScript full Node API access (filesystem, network, child_process, env). The detached + unref + `stdio:'ignore'` pattern is deliberate evasion to hide the child process from the consuming developer. A legitimate chai plugin has no reason to fetch and eval remote code.","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-plugin-kit (npm)","id":"MAL-2026-5906","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-plugin-kit","purl":"pkg:npm/chai-plugin-kit","source":"MAL-2026-5906"}],"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-2026-5906/"}