MalwarePublished 5 Aug 2026Updated 1 Sep 2026

@offa/offa-uwk (npm) · Malicious Code

Affects @offa/offa-uwkSource GCVE Database

Malicious package : remove @offa/offa-uwk and rotate any secrets on hosts that installed it.

Data as of 12 Sep 2026, 07:02 UTC

Classification

Malicious package

Published to npm · OSV MAL-2026-12326

What to do

Remove @offa/offa-uwk 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
npm@offa/offa-uwk	Affected =999.0.1 =999.0.0	Fixed in–

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Description

The npm package @offa/offa-uwk versions 999.0.0 and 999.0.1 contains malicious code that executes during installation. It collects sensitive environment information including hostname, username, current working directory, and all environment variables, which often contain credentials and tokens. This data is then sent to an attacker-controlled webhook. Additionally, a preinstall hook writes a marker file to a fixed path on the system.

Impact

Sensitive environment variables and system information are exfiltrated to an attacker-controlled endpoint during package installation. This can lead to credential compromise and unauthorized access to cloud services, repositories, and other resources. The presence of a marker file may indicate system compromise or persistence attempts.

Defensive guidance

Users should immediately uninstall the affected versions (=999.0.0 and =999.0.1) of the @offa/offa-uwk package and avoid installing it. Review environment variables and credentials for potential compromise and rotate any exposed secrets. Monitor for unauthorized access resulting from leaked tokens.

Summary

The @offa/offa-uwk npm package declares a postinstall hook that runs index.js. This script collects os.hostname(), os.userInfo().username, process.cwd(), and the entire process.env object, then sends this data as a JSON payload to a hardcoded attacker-controlled webhook URL. The environment variables may include sensitive tokens for AWS, GCP, GitHub, npm, and other services. A preinstall hook also writes a marker file to /home/OFFA/flag. This behavior constitutes malicious exfiltration of sensitive data during package installation.

References

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What to do

Affected software

Description

AI analysisMachine-generated, updated 12 Sep 2026, 07:02 UTC

Technical details

References

Community reviews