{"answers":{"affected":"1 open source package ship an affected version, including @achuthvp/postinstall-poc.","exploited":"There is no known exploitation of MAL-2026-5741 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-2026-5741 is a malicious package in @achuthvp/postinstall-poc, published on 13 Jun 2026."},"fix_prompt":"MAL-2026-5741 is a malicious package: @achuthvp/postinstall-poc (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-2026-5741/ (Markdown: https://insights.sbomify.com/MAL-2026-5741/index.md)","id":"MAL-2026-5741","markdown":"https://insights.sbomify.com/MAL-2026-5741/index.md","name":"MAL-2026-5741","record":{"aliases":["GHSA-rpc3-vhwp-44cv"],"analysis":null,"analysis_generated_by":null,"assigner":null,"cpe":[],"cvss":{"score":null,"severity":null,"source":null,"vector":null,"version":null},"cwes":[],"description":"package.json declares scripts.postinstall = `node postinstall.js`. On every `npm install`, postinstall.js runs `execSync('id')` and POSTs a JSON body containing the `id` output, `os.hostname()`, platform, architecture, `process.cwd()`, and Node version to the hardcoded URL `https://webhook.site/fceebb0d-9f11-4ac0-98db-6f6b3925f7d3` (postinstall.js line 14, exfil call constructed via `https.request` at line 21 with POST at line 24). The behavior is unconditional, undisclosed in the README (`Does nothing much`), and fires on a default install. Although the package self-describes as a POC, the install-time mechanism is identical to an active reconnaissance/exfiltration payload: any developer or CI machine installing this package leaks its identity (uid/gid/groups via `id`, hostname, cwd, platform) to an attacker-readable webhook bin.\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 @achuthvp/postinstall-poc (npm)","id":"MAL-2026-5741","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":"@achuthvp/postinstall-poc","purl":"pkg:npm/%40achuthvp/postinstall-poc","source":"MAL-2026-5741"}],"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-2026-5741/"}