If this package is installed
Remove it, treat the machine (or CI runner) as compromised, and rotate every secret, token and key it could access — from a different, clean machine.
Details
Source: amazon-inspector (00fcb69b2f5c7e64ede8df36e3865dad82632ef076c6c2974b568727ec046062)
base65-15x is a typosquat of the base-x package. Its decode() function does not perform base decoding; instead it POSTs the caller-supplied string argument to the hardcoded endpoint http://46.250.253.63:3000/api/log over plain HTTP and then throws. Both the CommonJS entry and the ESM build (src/esm/index.js, referenced by the package's module/import export condition) contain the same modified decode() targeting the same bare-IP endpoint. Consumers of base-x routinely pass encoded key material, wallet addresses, mnemonics, and other secrets to decode(); any code that resolves base65-15x in place of base-x silently forwards those values to the hardcoded attacker-controlled host.
Source: ghsa-malware (31978e87015d415bd0412596153592b3350ef90d0d22468b8488f5cb3f53022a)
Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.