MAL-2026-10116 Malicious code in jwtmethod (npm)
Malicious package
Published
MAL-2026-10116 is a malicious package: jwtmethod (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-2026-10116/ (Markdown: https://insights.sbomify.com/MAL-2026-10116/index.md)
- Package
- jwtmethod
- Registry
- npm
What is MAL-2026-10116?
MAL-2026-10116 is a malicious package in jwtmethod, published on 10 Jul 2026.
Official description
On module load, jwtmethod's decode.js executes a top-level routine that performs an HTTPS GET to https://jsonkeeper.com/b/E69V3 and passes the response body to
new Function.constructor('require', errCode), then invokes the resulting function with the host's require. The fetched content is attacker-controlled (jsonkeeper.com is a mutable third-party paste host) and is executed with full Node capabilities, giving the attacker arbitrary code execution on the installer's machine the moment any consumer imports the package. Package metadata is forged to impersonate the auth0/jsonwebtoken ecosystem: package.json sets author: auth0 and points repository/bugs at github.com/radix-ui/primitives, and README.md is the unrelated react-text documentation from radix-ui — a lure designed to entice installers looking for a JWT library.What should I do about MAL-2026-10116?
Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.