Which versions of bumdleer are malicious?

The following RubyGems versions of bumdleer are flagged malicious: 1.0.0, 1.0.27473. Treat any of these as compromised.

How do I remediate bumdleer if I installed it?

Remove bumdleer 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.

I already installed bumdleer — how do I know if it already compromised me?

If bumdleer 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.

Is bumdleer part of a known attack campaign?

Yes — bumdleer is associated with the RLMA-2026-07519 campaign. Packages in the same campaign often share infrastructure and payloads, so check whether any related packages are also in your dependency tree.

How do I find bumdleer across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for bumdleer (2 malicious versions).

Malicious package

bumdleerRubyGems

Advisory published Sep 22, 2026Updated Sep 24, 2026

bumdleer is a confirmed malicious RubyGems package (MAL-2026-16833) that executes malicious code on install (malicious versions 1.0.0, 1.0.27473). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in bumdleer (RubyGems)

MAL-2026-16833

Immediate action

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

gem uninstall bumdleer

Malicious versions

2 flagged

1.0.01.0.27473

Indicators of compromise (SHA-256)

8ba1b6c6680a74ae6b01a192e5314d953b0fc595b12e644f778ab09fa0b8f74c

Detection & response playbook

Malicious package

Find it
Search your lockfiles and build artifacts for bumdleer (2 malicious versions).
If you installed it — respond
Remove bumdleer 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.
Did it already run?
If bumdleer 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. bumdleer on RubyGems has been identified as a malicious package (versions 1.0.0, 1.0.27473 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

RLMA-2026-07519

Credits

ReversingLabs · finder

Detect & block this

O3 blocks bumdleer-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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