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Malicious package

jsb-adapternpm

Advisory published Updated

jsb-adapter is a confirmed malicious npm package (MAL-2026-15512) that executes malicious code on install (malicious version 45.0.0). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in jsb-adapter (npm)

MAL-2026-15512
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
npm uninstall jsb-adapter

What this malware does

package.json declares a dependency whose key (jsb-adapter) equals this package's own name and whose value is the bare HTTPS URL https://repo.securityctrl.com/jsb-adapter instead of a registry version range. On npm install, npm fetches whatever tarball that host currently returns, unpinned and with no integrity check, and runs any lifecycle scripts inside it — so the code executed on the installer is whoever controls repo.securityctrl.com at install time, not the published tarball. The shipped index.js is an inert stub, so the manifest line is the entire published payload. Aggravating shape: the dependency key matches the package's own name and the version 45.0.0 is implausibly high, consistent with dependency-confusion targeting an internal package of the same name.

Any 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.

Malicious versions

1 flagged
45.0.0

Indicators of compromise (SHA-256)

368bba2e9d134a0d1ce565627644361ebe98bbf7bc2fd04812ff7137c300eaac
d1f7aba38b9a7daa3d21cb1d57d50efdb1ffc6f22b82721a8008a668451e263a

Detection & response playbook

Malicious package
  1. Find it

    Search your lockfiles and build artifacts for jsb-adapter (version 45.0.0).

  2. If you installed it — respond

    Remove jsb-adapter from your project and lockfile, then assume any secrets accessible to the build or runtime were exposed: rotate API keys, tokens, and credentials, and audit for unexpected outbound activity or persistence.

  3. Did it already run?

    If jsb-adapter was installed, its post-install payload may already have run. Removing the package does not undo that — check outbound connections and credential use from the install window onward.

Frequently asked questions

No. jsb-adapter on npm has been identified as a malicious package (version 45.0.0 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-019080GHSA-69pf-x798-g22x

References

Credits

  • Amazon Inspector · finder

Detect & block this

O3 blocks jsb-adapter-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the malicious outbound activity and severs the channel.

Explore

jsb-adapter (npm) malicious package — MAL-2026-15512 | O3 Security