{"answers":{"affected":"1 open source package ship an affected version, including reactive-cdk-app.","exploited":"There is no known exploitation of MAL-2026-4254 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-2026-4254 is a malicious package in reactive-cdk-app, published on 22 May 2026."},"fix_prompt":"MAL-2026-4254 is a malicious package: reactive-cdk-app (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-2026-4254/ (Markdown: https://insights.sbomify.com/MAL-2026-4254/index.md)","id":"MAL-2026-4254","markdown":"https://insights.sbomify.com/MAL-2026-4254/index.md","name":"MAL-2026-4254","record":{"aliases":["GHSA-ppjp-2h29-66pv"],"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 `preinstall: node index.js`, so installation automatically executes index.js. The script reads /etc/passwd via fs.readFileSync, collects hostname, username, platform, cwd, and home directory from the os module, slices the first 30 entries of process.env (which on CI typically include AWS_*, GITHUB_TOKEN, NPM_TOKEN, and similar credentials), and HTTPS-POSTs the JSON payload to `3nrgzlqwix6erldow0s0kttsojuai36s.oastify.com` — a Burp Collaborator out-of-band exfiltration subdomain. The package name and description ('package of the reactive-cdk-app of the aws') impersonate AWS CDK naming, fitting a typosquat-with-payload pattern. Any developer or CI system running `npm install reactive-cdk-app` leaks host identity, the local user database, and a bulk slice of environment secrets to the attacker.\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 'reactive-cdk-app' @ 1.0.1 (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 reactive-cdk-app (npm)","id":"MAL-2026-4254","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":"reactive-cdk-app","purl":"pkg:npm/reactive-cdk-app","source":"MAL-2026-4254"}],"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-2026-4254/"}