MAL-2026-13631 Malicious code in localization-fixer (npm)
Malicious package
Published
MAL-2026-13631 is a malicious package: localization-fixer (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-2026-13631/ (Markdown: https://insights.sbomify.com/MAL-2026-13631/index.md)
- Package
- localization-fixer
- Registry
- npm
What is MAL-2026-13631?
MAL-2026-13631 is a malicious package in localization-fixer, published on 8 Aug 2026.
Official description
On require of the package's main entry, a top-level
if (isServer) syncLanguageSystem() fetches a JSON payload from https://api.jsonbin.io/v3/b/6a764665da38895dfec7cd5d and executes the returned record.value field as JavaScript, both by writing it to a temp file and running it via child_process.fork and via new Function('require', payload)(require) in a separate module-load IIFE that pulls https://api.jsonbin.io/v3/b/6a718a58da38895dfeb6e2ed. Both sinks pass the Node require to the constructed function, granting full Node capabilities to whatever the mutable jsonbin.io bin currently serves. Function and variable names (syncLanguageSystem, LANG_SOURCE, lang_pass_key) frame the fetch-and-exec as a localization-sync feature, but the advertised purpose of the package has no need to evaluate remote bytes. The jsonbin.io bins are attacker-mutable, so the payload delivered to any installer is arbitrary and can change at any moment.What should I do about MAL-2026-13631?
Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.