MAL-2026-13436 Malicious code in @wbnr/frontend-shared (npm)
Malicious package
Published
MAL-2026-13436 is a malicious package: @wbnr/frontend-shared (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-2026-13436/ (Markdown: https://insights.sbomify.com/MAL-2026-13436/index.md)
- Package
- @wbnr/frontend-shared
- Registry
- npm
What is MAL-2026-13436?
MAL-2026-13436 is a malicious package in @wbnr/frontend-shared, published on 6 Aug 2026.
Official description
The package declares a preinstall lifecycle script (preinstall.js) that automatically runs on npm install. The script reads the installer's OS username (from process.env USER/USERNAME) and hostname (os.hostname()), embeds them into a subdomain of a hardcoded 4otph6fase1x2won0hrfzul2wt2qqge5.oastify.com callback host, and transmits them via both a DNS lookup and an HTTPS GET to that host at path /depconf/. The behavior is consistent with a dependency-confusion probe using Burp Collaborator (oastify.com) infrastructure; installer identifiers (username, internal hostname, timestamp, package name) are disclosed to a third-party callback domain on every install.
What should I do about MAL-2026-13436?
Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.
Sources
Also known as GHSA-9vgv-g4jx-8g9w.