{"answers":{"affected":"1 open source package ship an affected version, including uolcs-host-uol-anuncios-fe.","exploited":"There is no known exploitation of MAL-2026-4185 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-2026-4185 is a malicious package in uolcs-host-uol-anuncios-fe, published on 20 May 2026."},"fix_prompt":"MAL-2026-4185 is a malicious package: uolcs-host-uol-anuncios-fe (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-2026-4185/ (Markdown: https://insights.sbomify.com/MAL-2026-4185/index.md)","id":"MAL-2026-4185","markdown":"https://insights.sbomify.com/MAL-2026-4185/index.md","name":"MAL-2026-4185","record":{"aliases":["GHSA-p4vr-mx6g-r574"],"analysis":null,"analysis_generated_by":null,"assigner":null,"cpe":[],"cvss":{"score":null,"severity":null,"source":null,"vector":null,"version":null},"cwes":[],"description":"Package claims an internal-scope corporate name (`uolcs-host-uol-anuncios-fe`) on public npm, version-pinned to 99.99.99 — the canonical dependency-confusion shape designed to win resolution against an internal package of the same name in a target organization's CI. Both `preinstall` and `postinstall` hooks in package.json invoke `node./callback.js`, which reads `os.hostname()` and `os.platform()`, embeds them as a subdomain label (`uolci-\u003chostname\u003e-\u003cplatform\u003e.d86r3dv5vn81lvohffp0131g8kdx9mz3c.oast.pro`), and issues a DNS A lookup. The destination `oast.pro` is the interactsh out-of-band interaction listener; the DNS query itself is the exfiltration channel, capturing the installer's hostname and OS at the listener owned by whoever controls that token. The README's claim of authorized research is not verifiable from package contents and does not change the installer-side effect: any CI host or developer machine that resolves this name from public npm leaks identity to a third party on `npm install`.\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 'uolcs-host-uol-anuncios-fe' @ 99.99.99 (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 uolcs-host-uol-anuncios-fe (npm)","id":"MAL-2026-4185","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":"uolcs-host-uol-anuncios-fe","purl":"pkg:npm/uolcs-host-uol-anuncios-fe","source":"MAL-2026-4185"}],"products":null,"published":"2026-05-20","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-2026-4185/"}