MalwarePublished 5 Aug 2026Updated 24 Sep 2026

chai-foundry (npm) · Malicious Code

Affects chai-foundrySource GCVE Database

Malicious package : remove chai-foundry and rotate any secrets on hosts that installed it.

Data as of 26 Oct 2026, 16:15 UTC

Classification

Malicious package

Published to npm · OSV MAL-2026-13356

What to do

Remove chai-foundry 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
npmchai-foundry	Affected =7.0.3 =7.0.2	Fixed in–

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Description

The npm package chai-foundry version 7.0.2 and 7.0.3 is identified as a trojanized malicious package masquerading as a chai plugin. It impersonates legitimate software by copying metadata from the pino logger and includes a heavily obfuscated multi-megabyte payload that executes immediately upon requiring the package. This payload hides its network endpoints and behavior, indicating it is a hostile dropper and stealer. Systems with this package installed should be considered fully compromised, and secrets and keys must be rotated from a separate, clean system.

Impact

Any computer with chai-foundry versions 7.0.2 or 7.0.3 installed or running should be considered fully compromised. The malicious code likely grants full control to an attacker, risking theft of secrets, keys, and other sensitive data. Removal of the package alone does not guarantee elimination of all malicious artifacts or backdoors.

Defensive guidance

Remove the malicious chai-foundry package immediately. Rotate all secrets, keys, and credentials from a separate, uncompromised system. Because the package likely grants full system compromise, consider a full system rebuild or forensic analysis to ensure no persistent backdoors remain.

Summary

The malicious npm package chai-foundry versions 7.0.2 and 7.0.3 impersonates a chai plugin but contains a large, heavily obfuscated payload loaded at import time. The package metadata is copied from the pino logger, and the main code uses complex obfuscation techniques including a large rotated string array, runtime decoders, and control-flow flattening to hide its behavior and network endpoints. This design is typical of hostile npm droppers and stealers that compromise systems upon installation.

References

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What to do

Affected software

Description

AI analysisMachine-generated, updated 12 Sep 2026, 07:01 UTC

Technical details

References

Community reviews