{"answers":{"affected":"1 open source package ship an affected version, including @engagehub/core.","exploited":"There is no known exploitation of MAL-2026-4258 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-2026-4258 is a malicious package in @engagehub/core, published on 22 May 2026."},"fix_prompt":"MAL-2026-4258 is a malicious package: @engagehub/core (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-2026-4258/ (Markdown: https://insights.sbomify.com/MAL-2026-4258/index.md)","id":"MAL-2026-4258","markdown":"https://insights.sbomify.com/MAL-2026-4258/index.md","name":"MAL-2026-4258","record":{"aliases":["GHSA-5hgc-pmxv-3xh7"],"analysis":null,"analysis_generated_by":null,"assigner":null,"cpe":[],"cvss":{"score":null,"severity":null,"source":null,"vector":null,"version":null},"cwes":[],"description":"All three lifecycle hooks (preinstall, install, postinstall) in package.json invoke `node telemetry.js`, so the payload fires unconditionally on `npm install`. telemetry.js gathers host context (OS, arch, Node version, pid) and CI-provider fingerprints by reading GITHUB_ACTIONS, AZURE_DEVOPS, and JENKINS_HOME, hex-encodes a JSON blob, and exfiltrates it as chunked `dns.lookup()` queries whose subdomain labels carry the encoded data. The destination is built via string concatenation to evade scanners: `\"d82atu5fokal0459\"+\"5n00qkgj7qiyixx7a\"+\".\"+\"oa\"+\"st\"+\".\"+\"li\"+\"ve\"`, resolving to a token under oast.live — an out-of-band interaction (interactsh) service commonly used by attackers as a covert DNS C2/exfil channel. The package additionally impersonates Microsoft (false `Copyright (c) Microsoft Corporation` header, fabricated `github.com/microsoft/core` repository URL, references to a nonexistent `engdocs.microsoft.com` docs site) under an UNLICENSED license to lend credibility to the dropper. Installing this package on a developer workstation or CI runner leaks host and CI-environment fingerprints to attacker-controlled infrastructure and confirms the package is reachable for follow-on targeting.\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.\n\nThe OpenSSF Package Analysis project identified '@engagehub/core' @ 99.0.0 (npm) as malicious.\n\nIt is considered malicious because:\n\n- The package communicates with a domain associated with malicious activity.","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 @engagehub/core (npm)","id":"MAL-2026-4258","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":"@engagehub/core","purl":"pkg:npm/%40engagehub%2Fcore","source":"MAL-2026-4258"}],"products":null,"published":"2026-05-22","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-2026-4258/"}