MAL-2026-13748 Malicious code in base65-15x (npm)
Malicious package
Published
MAL-2026-13748 is a malicious package: base65-15x (npm). Every version was published to cause harm.
Task:
1. Search this repository's dependency manifests and lockfiles for the package, including transitive dependencies.
2. If it is present, remove it, regenerate the lockfile with the project's package manager, and replace whatever it was used for.
3. List any CI runners, developer machines or containers that installed it, so their secrets can be rotated.
4. If the package is not used anywhere, say so and change nothing.
Reference: https://insights.sbomify.com/MAL-2026-13748/ (Markdown: https://insights.sbomify.com/MAL-2026-13748/index.md)
- Package
- base65-15x
- Registry
- npm
What is MAL-2026-13748?
MAL-2026-13748 is a malicious package in base65-15x, published on 11 Aug 2026.
Official description
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.
What should I do about MAL-2026-13748?
Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.