# MAL-2026-10977: Malicious code in lebinfmt (PyPI)


- **Type:** Malicious package
- **Package:** `lebinfmt` (PyPI)
- **Published:** 21 Jul 2026

## What is MAL-2026-10977?

MAL-2026-10977 is a malicious package in lebinfmt, published on 21 Jul 2026. 

### Official description

Analysis of lebinfmt 1.0.0 surfaced no behaviors matching supply-chain attack classes. No install-time or import-time network I/O, no credential or filesystem enumeration, no subprocess execution of fetched content, no lifecycle hooks performing sensitive actions, and no hardcoded external destinations were identified across the six files reviewed.

This package is prepared to perform steganography decoding using the same code and was published on the same day as package 'rasterkit,' later used to deliver malicious payload.

---

Category: MALICIOUS - The campaign has clearly malicious intent, like infostealers.

Campaign: 2026-06-textwrap-toolkit-stager

Reasons (based on the campaign):

 - backdoor

 - obfuscation

 - crypto-related

 - Downloads and executes a remote malicious script.

 - exfiltration-crypto

## What should I do about MAL-2026-10977?

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-2026-10977 is a malicious package: lebinfmt (PyPI). 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-2026-10977/ (Markdown: https://insights.sbomify.com/MAL-2026-10977/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-10977

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-10977/
Summaries are generated and may contain mistakes; the official description above is the record.