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Malicious package

transform-es2015-sticky-regexnpm

Advisory published Updated

transform-es2015-sticky-regex is a confirmed malicious npm package (MAL-2026-10136) that executes malicious code on install (malicious version 6.24.3). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in transform-es2015-sticky-regex (npm)

MAL-2026-10136
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
npm uninstall transform-es2015-sticky-regex

What this malware does

package.json declares both a dependency and a devDependency on 'transform-es2015-sticky-regex' pointing at http://pack.nppacks.com/npm/transform-es2015-sticky-regex. On npm install, npm fetches whatever tarball that plain-HTTP, non-registry host currently serves and installs it into node_modules with no version pin and no integrity hash — the maintainer of pack.nppacks.com can substitute arbitrary code at any time and it will land in the installer's dependency tree on the next install. The package name is also a namespace-confusion of the well-known 'babel-plugin-transform-es2015-sticky-regex' (Babel plugin naming convention prefixes 'babel-plugin-'); the shipped index.js does not implement the sticky-regex transform but a DefinePlugin-style identifier replacer, and a source comment states the package is 'for Security Research Testing Purpose'. Additional network-capable dependencies (axios, node-fetch, ws) are declared but unused by the shipped code, pre-staging network primitives for whatever the swapped tarball chooses to import.

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
6.24.3

Indicators of compromise (SHA-256)

eadf76ef8e123f9ce50c2910c71912996a3d079a91076ffed8d29830a1687ae1
fbccc4d6dca0a1f548d1ed96dbd966332bb06ed8ba0f727a28b7b3ba74520cc0

Detection & response playbook

Malicious package

  1. Find it

    Search your lockfiles and build artifacts for transform-es2015-sticky-regex (version 6.24.3).

  2. If you installed it — respond

    Remove transform-es2015-sticky-regex 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 transform-es2015-sticky-regex 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. transform-es2015-sticky-regex on npm has been identified as a malicious package (version 6.24.3 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-009622GHSA-2j63-q9jc-966c

References

Credits

  • Amazon Inspector · finder

Detect & block this

O3 blocks transform-es2015-sticky-regex-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.

Malware detection Runtime egress monitoring

Explore

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transform-es2015-sticky-regex (npm) malicious package — MAL-2026-10136 | O3 Security