MAL-2026-12587 Malicious code in checkout-postpone-until-render (npm)
Malicious package
Published
MAL-2026-12587 is a malicious package: checkout-postpone-until-render (npm). Every version was published to cause harm.
Task:
1. Search this repository's dependency manifests and lockfiles for the package, including transitive dependencies.
2. If it is present, remove it, regenerate the lockfile with the project's package manager, and replace whatever it was used for.
3. List any CI runners, developer machines or containers that installed it, so their secrets can be rotated.
4. If the package is not used anywhere, say so and change nothing.
Reference: https://insights.sbomify.com/MAL-2026-12587/ (Markdown: https://insights.sbomify.com/MAL-2026-12587/index.md)
- Package
- checkout-postpone-until-render
- Registry
- npm
What is MAL-2026-12587?
MAL-2026-12587 is a malicious package in checkout-postpone-until-render, published on 5 Aug 2026.
Official description
On require() of the package, index.js loads./vendor.js which assembles Cloudflare Workers hostnames (oob-worker.cf*.workers.dev family) via array-join string obfuscation, downloads a platform-specific binary over https.get with a DNS-TXT chunked fallback under *.dl.wel1.ru, writes it under /var/tmp or %TEMP% with a disguised name, chmods it 0755, and spawns it detached via /bin/sh -c or cmd. Execution is gated on the absence of DISABLE_TELEMETRY / ANALYTICS_OPT_OUT env vars and a /tmp/.analytics_state TTL flag to suppress repeated runs. A second copy of the drop-and-execute routine ships in lib/telemetry.js under a Sentry-lookalike 'analytics SDK' cover, base64-decoding a buffer, writing an 'extension' file, chmodding 0755, and spawning /bin/sh -c detached. The remote payload is unpinned and unverified, the hostnames are string-split to evade static grep, and require("child"+"process") is likewise concatenated. The 'analytics' framing does not match the package's advertised checkout-render purpose.
What should I do about MAL-2026-12587?
Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.