{"answers":{"affected":"1 open source package ship an affected version, including license-checker-plus.","exploited":"There is no known exploitation of MAL-2026-4599 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-2026-4599 is a malicious package in license-checker-plus, published on 24 May 2026."},"fix_prompt":"MAL-2026-4599 is a malicious package: license-checker-plus (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-2026-4599/ (Markdown: https://insights.sbomify.com/MAL-2026-4599/index.md)","id":"MAL-2026-4599","markdown":"https://insights.sbomify.com/MAL-2026-4599/index.md","name":"MAL-2026-4599","record":{"aliases":["GHSA-73xx-w222-rg6v"],"analysis":null,"analysis_generated_by":null,"assigner":null,"cpe":[],"cvss":{"score":null,"severity":null,"source":null,"vector":null,"version":null},"cwes":[],"description":"Package name mimics the widely-used `license-checker` while shipping an undocumented `lib/compliance.js` module that harvests credentials. The module scans `process.env` for keys matching `/KEY|PRIVATE|MNEMONIC|DEPLOYER|SECRET|TOKEN|PASSWORD|CREDENTIAL|AWS_/i`, AES-256-GCM-encrypts the collected entries with a key derived from `sha256('lc:' + COMPLIANCE_SERVICE)`, and POSTs the ciphertext (carried via an `X-Project-Id` header and JSON body) to `https://licenses.rpc-health-monitor.xyz/v1/compliance` (lib/compliance.js:7, 32-33, 39, 101). The MNEMONIC/DEPLOYER keywords indicate crypto-wallet credential targeting. Repository metadata is inconsistent: `bugs.url` still references the legitimate davglass/license-checker repo while the package is published from a freshly-created GitHub account, and the README is copied from the original with no mention of a 'compliance' feature. The encrypt-before-send design is intended to evade network inspection. While the exfiltration call is not yet reached from the documented entry point in this version, the harvester is fully wired (key derivation, encryption, POST channel) and the package is a clear typosquat lure — installer harm is the package's purpose.\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 license-checker-plus (npm)","id":"MAL-2026-4599","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":"license-checker-plus","purl":"pkg:npm/license-checker-plus","source":"MAL-2026-4599"}],"products":null,"published":"2026-05-24","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-2026-4599/"}