# eslint-plugin-executable-stories-jest (npm) malicious package — MAL-2026-5247 | O3 Security

Malicious package

# eslint-plugin-executable-stories-jestnpm

Advisory published Jun 5, 2026·Updated Jul 8, 2026

eslint-plugin-executable-stories-jest is a confirmed malicious npm package (MAL-2026-5247) that steals credentials and exfiltrates sensitive data (malicious versions 1.2.1, 2.1.8). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in eslint-plugin-executable-stories-jest (npm)

MAL-2026-5247

Immediate action

Remove the package, then rotate any secrets the build/runtime could reach.

npm uninstall eslint-plugin-executable-stories-jest

## What this malware does

The package was found to contain malicious code or consuming dependency that contains malicious code

The Miasma malware is a self-propagating worm that spreads across the npm registry by abusing weaponized `binding.gyp` files to achieve execution during package installation, bypassing security tools that only inspect package lifecycle scripts. Upon execution, the malware attempts to exfiltrate credentials and OIDC tokens for various cloud and registry services, and propagates by compromising other packages managed by the stolen accounts or committing backdoor files to GitHub repositories.

## Malicious versions

2 flagged

1.2.12.1.8

## Indicators of compromise (SHA-256)

a6c7977dbc054cdb7fe56da0d2fbd26e2a6fed695deb4263ccbf4adfedd86acb

f57bad4c5897c34b725457a558ebfe9df86ff8092f5bfd36b1568d6dc5e84da8

0275fad6c40b4d88a152bad60d8190fdfefe499777a338972416d8a137dd1f6d

## Detection & response playbook

Credential / info stealer

1.  ### Find it
    
    Search your lockfiles and build artifacts for eslint-plugin-executable-stories-jest (2 malicious versions).
    
2.  ### If you installed it — respond
    
    eslint-plugin-executable-stories-jest is built to steal secrets, so assume every credential the build or runtime could read is compromised. Remove it from your project and lockfile, then rotate ALL exposed secrets — npm/registry tokens, cloud keys, CI/CD secrets, SSH keys, and any .env values — from a known-clean machine. Audit logs for unauthorized use of those credentials.
    
3.  ### Did it already run?
    
    If eslint-plugin-executable-stories-jest was installed, its post-install payload may already have run. Removing the package does not undo that — check outbound connections and credential use from the install window onward.
    

## Frequently asked questions

No. eslint-plugin-executable-stories-jest on npm has been identified as a malicious package (versions 1.2.1, 2.1.8 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

## Campaign

IN-MAL-2026-008420IN-MAL-2026-008641

## References

-   [endorlabs.com](https://www.endorlabs.com/learn/malicious-payload-in-ai-sdk-ollama-npm-package)
-   [stepsecurity.io](https://www.stepsecurity.io/blog/binding-gyp-npm-supply-chain-attack-spreads-like-worm)
-   [npmjs.com](https://www.npmjs.com/package/eslint-plugin-executable-stories-jest/v/2.1.8)
-   [npmjs.com](https://www.npmjs.com/package/eslint-plugin-executable-stories-jest/v/1.2.1)

## Credits

-   Amazon Inspector · finder

## Detect & block this

O3 blocks eslint-plugin-executable-stories-jest\-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the credential exfiltration and severs the channel.

[Malware detection](/malware-detection) [Runtime egress monitoring](/egress-monitor)

## Explore

[All malware advisories](/malware) [How O3 detects malware](/malware-database) [Vulnerability database](/vulnerability)