# MAL-2026-13760: Malicious code in bs58-13 (npm)


- **Type:** Malicious package
- **Package:** `bs58-13` (npm)
- **Published:** 11 Aug 2026
- **Also known as:** GHSA-72pr-qcvq-fgpg

## What is MAL-2026-13760?

MAL-2026-13760 is a malicious package in bs58-13, published on 11 Aug 2026. 

### Official description

Package name, README, and keywords mirror the popular base58 encoding library bs58, but the main module contains only require("base65-13x") and re-exports its result. The declared runtime dependency base65-13x is a name-lookalike of the genuine base-x library that bs58 normally depends on. The wrapper itself declares no lifecycle scripts and performs no network I/O, filesystem access, or shell execution; installing this package resolves and loads base65-13x in place of base-x.

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.

## What should I do about MAL-2026-13760?

Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.

## Fix prompt for AI coding agents

```text
MAL-2026-13760 is a malicious package: bs58-13 (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-2026-13760/ (Markdown: https://insights.sbomify.com/MAL-2026-13760/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-13760

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-13760/
Summaries are generated and may contain mistakes; the official description above is the record.