{"answers":{"affected":"1 open source package ship an affected version, including sheratan_haha.","exploited":"There is no known exploitation of MAL-2026-5739 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-2026-5739 is a malicious package in sheratan_haha, published on 13 Jun 2026."},"fix_prompt":"MAL-2026-5739 is a malicious package: sheratan_haha (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-2026-5739/ (Markdown: https://insights.sbomify.com/MAL-2026-5739/index.md)","id":"MAL-2026-5739","markdown":"https://insights.sbomify.com/MAL-2026-5739/index.md","name":"MAL-2026-5739","record":{"aliases":[],"analysis":null,"analysis_generated_by":null,"assigner":null,"cpe":[],"cvss":{"score":null,"severity":null,"source":null,"vector":null,"version":null},"cwes":[],"description":"On `npm install`, the package's declared postinstall hook (`node postinstall.js`) runs `whoami` on the installer's machine and POSTs the output to a hardcoded webhook.site endpoint (`https://webhook.site/0ea9eb45-3ede-4cf0-9ea9-2b8d700272e7`) via `https.request`. The package advertises itself as 'A simple date formatting utility' but ships no library code consistent with that purpose — the only behavior on install is host fingerprinting and exfiltration to an attacker-controlled URL. Metadata is placeholder-shaped (empty author, generic description, name `sheratan_haha`), consistent with a dependency-confusion / recon PoC. Installing this package leaks the installer's OS username to an external endpoint controlled by the publisher.","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 sheratan_haha (npm)","id":"MAL-2026-5739","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":"sheratan_haha","purl":"pkg:npm/sheratan_haha","source":"MAL-2026-5739"}],"products":null,"published":"2026-06-13","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-2026-5739/"}