{"answers":{"affected":"1 open source package ship an affected version, including @jsimplify/errno.","exploited":"There is no known exploitation of MAL-2026-12006 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-2026-12006 is a malicious package in @jsimplify/errno, published on 4 Aug 2026."},"fix_prompt":"MAL-2026-12006 is a malicious package: @jsimplify/errno (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-2026-12006/ (Markdown: https://insights.sbomify.com/MAL-2026-12006/index.md)","id":"MAL-2026-12006","markdown":"https://insights.sbomify.com/MAL-2026-12006/index.md","name":"MAL-2026-12006","record":{"aliases":["GHSA-vgg6-7x38-g434"],"analysis":null,"analysis_generated_by":null,"assigner":null,"cpe":[],"cvss":{"score":null,"severity":null,"source":null,"vector":null,"version":null},"cwes":[],"description":"The package declares a `scripts.install` hook that spawns `bun index.js` detached and unref'd on `npm install`, and pulls in `bun` as a declared dependency to guarantee the alternate runtime is present. `index.js` decrypts a hardcoded hex ciphertext with AES-256-CBC using an embedded key and IV to reconstruct a remote URL, fetches that URL, and passes the response body directly to `eval()`. This is a lifecycle-time dropper that executes attacker-controlled code on the installer's machine with the privileges of the user running `npm install`, with the destination URL obfuscated behind AES so it cannot be read from the source. The package presents itself as an errno-code lookup library, copying the code, README, description, and author string (`Rod Vagg @rvagg`) of the legitimate `errno` package while pointing `repository.url` at a different GitHub account (`maxpsmith/node-errno`); the errno-lookup functionality is a cover for the install-time execution path and there is no legitimate reason for an errno lookup library to AES-decrypt and eval remote content at install.\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 @jsimplify/errno (npm)","id":"MAL-2026-12006","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":"@jsimplify/errno","purl":"pkg:npm/%40jsimplify/errno","source":"MAL-2026-12006"}],"products":null,"published":"2026-08-04","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-2026-12006/"}