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MAL-2026-10436

Malicious code in jest-formatter (npm)

Details

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## Source: amazon-inspector (af1f270f7df9ee4f9088044964921e1b085b809ddb1d696e652326c58e5c0aba) The package jest-formatter@1.0.0 presents itself as a Jest test output formatter but its lib/collect.js imports child_process and invokes execSync with bash and zsh at lines 205 and 221. The 'collect' module name combined with shell execution via multiple shells is consistent with harvesting installer-side data (shell history, credentials, environment) from Unix hosts. The behavior does not match the advertised purpose of formatting test output, and the traced content matched patterns associated with credential/data collection payloads. Concrete shell-exec sinks in a module named 'collect' inside a package with no legitimate need for bash/zsh invocation indicate an active data-collection payload rather than a formatter library.

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Affected packages

npm / jest-formatter

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References