Which versions of bbumdler are malicious?

The following RubyGems versions of bbumdler are flagged malicious: 1.0.0, 1.0.84252. Treat any of these as compromised.

How do I remediate bbumdler if I installed it?

Remove bbumdler 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 bbumdler — how do I know if it already compromised me?

If bbumdler 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 bbumdler part of a known attack campaign?

Yes — bbumdler is associated with the RLMA-2026-07220 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 bbumdler across my projects, lockfiles, and CI pipelines?

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

Malicious package

bbumdlerRubyGems

Advisory published Sep 22, 2026Updated Sep 24, 2026

bbumdler is a confirmed malicious RubyGems package (MAL-2026-16572) that executes malicious code on install (malicious versions 1.0.0, 1.0.84252). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in bbumdler (RubyGems)

MAL-2026-16572

Immediate action

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

gem uninstall bbumdler

Malicious versions

2 flagged

1.0.01.0.84252

Indicators of compromise (SHA-256)

d2c7b6ea8272c52a34e126b65423b8d05a4eade9fae53e44b0ae4af4dc2976d1

Detection & response playbook

Malicious package

Find it
Search your lockfiles and build artifacts for bbumdler (2 malicious versions).
If you installed it — respond
Remove bbumdler 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 bbumdler 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. bbumdler on RubyGems has been identified as a malicious package (versions 1.0.0, 1.0.84252 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

RLMA-2026-07220

Credits

ReversingLabs · finder

Detect & block this

O3 blocks bbumdler-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

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