{"answers":{"affected":"1 open source package ship an affected version, including type-check-816d.","exploited":"There is no known exploitation of MAL-2026-6101 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-2026-6101 is a malicious package in type-check-816d, published on 18 Jun 2026."},"fix_prompt":"MAL-2026-6101 is a malicious package: type-check-816d (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-2026-6101/ (Markdown: https://insights.sbomify.com/MAL-2026-6101/index.md)","id":"MAL-2026-6101","markdown":"https://insights.sbomify.com/MAL-2026-6101/index.md","name":"MAL-2026-6101","record":{"aliases":["GHSA-q7qm-cfrq-fg6g"],"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 postinstall hook (\"postinstall\": \"node run.js\") that runs run.js automatically on `npm install`. run.js imports os, https, http, and child_process, reads host identifiers and environment data (process.env.USER, os.hostname(), os.platform(), process.cwd()), base64-encodes the payload (Buffer.from(...).toString('base64')), and exfiltrates it via outbound HTTP/HTTPS requests (multiple POST calls and a GET). The package name appears to be a numeric-suffixed lure with no legitimate documented purpose, and the postinstall behavior is a credential/host-recon exfiltration pattern rather than any build or setup task. Installing this package causes immediate, unattended exfiltration of installer host data to an attacker-controlled endpoint.\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 type-check-816d (npm)","id":"MAL-2026-6101","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":"type-check-816d","purl":"pkg:npm/type-check-816d","source":"MAL-2026-6101"}],"products":null,"published":"2026-06-18","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-2026-6101/"}