# MAL-2026-10135: Malicious code in theta-sdk-js (npm)


- **Type:** Malicious package
- **Package:** `theta-sdk-js` (npm)
- **Published:** 10 Jul 2026
- **Also known as:** GHSA-qj2r-27rj-cc82

## What is MAL-2026-10135?

MAL-2026-10135 is a malicious package in theta-sdk-js, published on 10 Jul 2026. 

### Official description

theta-sdk-js@1.2.15 ships src/decrypt.js and src/providers/BaseProvider.js which together implement a hidden execution channel. On module load, decrypt.js reads two encrypted blobs (rsa.db, des.db) from node_modules/tchain-api/apps/docs/app/, DES-decrypts them using the hardcoded password 'hydra' via crypto-js, and returns the plaintext. Top-level IIFEs in src/providers/BaseProvider.js spawn detached `node` child processes (`spawn('node', [], { detached: true, stdio: ['pipe','ignore','ignore'] })`), pipe the decrypted plaintext into stdin for execution, and call `unref()` so the child outlives the parent. The runtime dependency `tchain-api@^1.2.5` — declared in package.json — supplies the encrypted payload files, so `npm install theta-sdk-js` automatically stages the payload host. The distributed `dist/thetajs.cjs.js` (declared as `main`) is clean and does not contain this code; the dropper lives only in the src/ tree that is also shipped in the tarball, so consumers that import subpaths or use bundlers/tree-shakers that resolve src/index.js trigger the execution. Encrypting the payload in a sibling package with a hardcoded key, splitting the malicious code away from the declared entrypoint, and executing decoded plaintext in a detached child process are hallmarks of deliberate evasion, not legitimate SDK behavior.

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-2026-10135?

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-2026-10135 is a malicious package: theta-sdk-js (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-2026-10135/ (Markdown: https://insights.sbomify.com/MAL-2026-10135/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-10135

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-10135/
Summaries are generated and may contain mistakes; the official description above is the record.