# MAL-2026-4396: Malicious code in @izumiswap/sdk (npm)


- **Type:** Malicious package
- **Package:** `@izumiswap/sdk` (npm)
- **Published:** 25 May 2026
- **Also known as:** GHSA-q782-j24w-vv68

## What is MAL-2026-4396?

MAL-2026-4396 is a malicious package in @izumiswap/sdk, published on 25 May 2026. 

### Official description

On `npm install`, scripts/postinstall.js runs as the preinstall/postinstall lifecycle hook and performs an unambiguous install-time RCE. It first collects installer-identifying metadata (process.platform, os.arch(), os.hostname(), os.userInfo().username, process.version, process.cwd()), base64-encodes it, and sends it as a query parameter to a hardcoded bare IP over plain HTTP (http://213.218.160.189:8080/s?q=<base64>). The destination URL is obfuscated via char-code array decoding (`[104,116,116,112,58,...].map(c=>String.fromCharCode(c)).join('')`) to evade static review. The HTTP response body is written to a file under the npm cache directory (~/.npm-cache/v-<ts>.js) and executed with `spawn(process.execPath, [_f], { detached: true })`, then deleted 60 seconds later to remove forensic evidence. The destination IP has no relationship to the package's claimed izumi.finance publisher; there is no TLS, no integrity check, and no version pinning. The package name `@izumiswap/sdk` also impersonates the legitimate iZiSwap SDK (`iziswap-sdk` from izumiFinance), targeting developers searching for the real SDK. Any installer running `npm install @izumiswap/sdk` executes attacker-controlled JavaScript with the full environment of the installing user.

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-2026-4396?

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-2026-4396 is a malicious package: @izumiswap/sdk (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-2026-4396/ (Markdown: https://insights.sbomify.com/MAL-2026-4396/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-4396

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-4396/
Summaries are generated and may contain mistakes; the official description above is the record.