checkout-use-boolean (npm) · Malicious Code
Affects checkout-use-booleanSource GCVE Database
Malicious package : remove checkout-use-boolean and rotate any secrets on hosts that installed it.
Data as of 5 Aug 2026, 16:05 UTC
Malicious package
Published to npm · OSV MAL-2026-12600
What to do
Remove checkout-use-boolean 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 |
|---|---|---|
| npmcheckout-use-boolean | Affected
| Fixed in– |
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Description
The npm package 'checkout-use-boolean' version 35.4.5 contains malicious code that executes upon module import. It loads a secondary script that downloads a platform-specific binary from obfuscated worker domains, using DNS TXT record fallback channels to evade detection. The payload is saved to temporary directories with disguised filenames, made executable, and launched detached via system shell commands. This behavior triggers automatically when the package is required by any other module.