{"answers":{"affected":"1 open source package ship an affected version, including jsf-utils.","exploited":"There is no known exploitation of MAL-2026-6921 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-2026-6921 is a malicious package in jsf-utils, published on 7 Jul 2026."},"fix_prompt":"MAL-2026-6921 is a malicious package: jsf-utils (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-2026-6921/ (Markdown: https://insights.sbomify.com/MAL-2026-6921/index.md)","id":"MAL-2026-6921","markdown":"https://insights.sbomify.com/MAL-2026-6921/index.md","name":"MAL-2026-6921","record":{"aliases":["GHSA-2jff-wp39-wgch"],"analysis":null,"analysis_generated_by":null,"assigner":null,"cpe":[],"cvss":{"score":null,"severity":null,"source":null,"vector":null,"version":null},"cwes":[],"description":"On require('jsf-utils'), lib/string/pathcase.js runs a top-level async IIFE that fetches a JavaScript payload from https://jsonkeeper.com/b/BPB86 and executes it in-process via Function.constructor with access to the installer's require. The file is auto-loaded because lib/index.js and lib/string/index.js recursively require every module in the tree. The exported pathcase function additionally spawns a detached, stdio-ignored `node` child process using the fetched script as argv, extending execution beyond the import-time IIFE and surviving parent exit. The remote-fetch-and-eval logic is placed inside a file whose stated purpose is a trivial string helper (pathcase), with the original benign implementation left commented out below the payload — concealment inside an innocuous utility. The package impersonates jonschlinkert/utils by reusing that project's author, homepage, and repository metadata while shipping under the name jsf-utils. Because the payload host is a mutable anonymous paste service, the executed code can be changed by the attacker at any time without republishing the package.\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 jsf-utils (npm)","id":"MAL-2026-6921","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":"jsf-utils","purl":"pkg:npm/jsf-utils","source":"MAL-2026-6921"}],"products":null,"published":"2026-07-07","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-2026-6921/"}