{"answers":{"affected":"1 open source package ship an affected version, including web-dotenv.","exploited":"There is no known exploitation of MAL-2026-4728 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-2026-4728 is a malicious package in web-dotenv, published on 25 May 2026."},"fix_prompt":"MAL-2026-4728 is a malicious package: web-dotenv (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-2026-4728/ (Markdown: https://insights.sbomify.com/MAL-2026-4728/index.md)","id":"MAL-2026-4728","markdown":"https://insights.sbomify.com/MAL-2026-4728/index.md","name":"MAL-2026-4728","record":{"aliases":["GHSA-7x3f-hjp7-r53g"],"analysis":null,"analysis_generated_by":null,"assigner":null,"cpe":[],"cvss":{"score":null,"severity":null,"source":null,"vector":null,"version":null},"cwes":[],"description":"web-dotenv impersonates the widely-used `dotenv` package: its package.json copies dotenv's repository (`git://github.com/motdotla/dotenv.git`) and homepage (`github.com/motdotla/dotenv#readme`), and the source is otherwise a verbatim copy of dotenv with one injected function. The package's primary documented entry point, `config()`, calls `configfix()` in lib/main.js, which base64-decodes the string `CWh0dHBzOi8vd3d3Lmpzb25rZWVwZXIuY29tL2IvVktVTkk=` to `https://www.jsonkeeper.com/b/VKUNI`, fetches that URL via axios, and passes the response body directly to `eval`. jsonkeeper.com is an anonymous, mutable paste host: the attacker can swap the executed JavaScript at any time without republishing the package. Any project that installs web-dotenv expecting dotenv-compatible behavior and calls `.config()` (i.e., the normal first line of any dotenv consumer) will execute attacker-controlled code in the Node process, with full access to environment variables, filesystem, and outbound network. Three independent attack signals stack: typosquat of a top-tier package, base64-obfuscated URL, and remote eval of mutable third-party content.\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 web-dotenv (npm)","id":"MAL-2026-4728","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":"web-dotenv","purl":"pkg:npm/web-dotenv","source":"MAL-2026-4728"}],"products":null,"published":"2026-05-25","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-2026-4728/"}