mcp-contract-tester (npm) · Malicious Code
Affects mcp-contract-testerSource GCVE Database
Malicious package : remove mcp-contract-tester and rotate any secrets on hosts that installed it.
Data as of 10 Nov 2026, 18:20 UTC
Malicious package
Published to npm · OSV MAL-2026-19082
What to do
Remove mcp-contract-tester 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 |
|---|---|---|
| npmmcp-contract-tester | Affected– | Fixed in– |
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Description
The npm package 'mcp-contract-tester' contains malicious code that fully compromises any computer on which it is installed or running. This compromise includes potential unauthorized access to all secrets and keys stored on the affected system. Immediate removal of the package is advised, but complete remediation may require rotating all secrets and keys from a separate, uncompromised device due to the risk of persistent malicious software.