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Malicious package

bunuderRubyGems

Advisory published Updated

bunuder is a confirmed malicious RubyGems package (MAL-2026-17125) that executes malicious code on install (malicious version 1.0.43564). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in bunuder (RubyGems)

MAL-2026-17125
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
gem uninstall bunuder

Malicious versions

1 flagged
1.0.43564

Indicators of compromise (SHA-256)

fc42b4ea72e4d1ebdb0d6c64666c3b2792d0d6033952da07ed3dff7ab7184970

Detection & response playbook

Malicious package

  1. Find it

    Search your lockfiles and build artifacts for bunuder (version 1.0.43564).

  2. If you installed it — respond

    Remove bunuder from your project and lockfile, then assume any secrets accessible to the build or runtime were exposed: rotate API keys, tokens, and credentials, and audit for unexpected outbound activity or persistence.

  3. Did it already run?

    If bunuder 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. bunuder on RubyGems has been identified as a malicious package (version 1.0.43564 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

RLMA-2026-07814

Credits

  • ReversingLabs · finder

Detect & block this

O3 blocks bunuder-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the malicious outbound activity and severs the channel.

Malware detection Runtime egress monitoring

Explore

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bunuder (RubyGems) malicious package — MAL-2026-17125 | O3 Security