checkout-checkout-test-block-aff (npm) · Malicious Code
Affects checkout-checkout-test-block-affSource GCVE Database
Malicious package : remove checkout-checkout-test-block-aff and rotate any secrets on hosts that installed it.
Data as of 5 Aug 2026, 15:52 UTC
Malicious package
Published to npm · OSV MAL-2026-12547
What to do
Remove checkout-checkout-test-block-aff 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-checkout-test-block-aff | Affected
| Fixed in– |
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Description
The npm package 'checkout-checkout-test-block-aff' version 35.9.6 contains malicious code that downloads and executes a platform-specific payload from attacker-controlled infrastructure. The payload is disguised with names mimicking legitimate tools and executed without integrity verification, enabling arbitrary remote code execution on the host system upon installation or require.