Which versions of bumdnler are malicious?

The following RubyGems versions of bumdnler are flagged malicious: 1.0.0, 1.0.50246. Treat any of these as compromised.

How do I remediate bumdnler if I installed it?

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

If bumdnler 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 bumdnler part of a known attack campaign?

Yes — bumdnler is associated with the RLMA-2026-07557 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 bumdnler across my projects, lockfiles, and CI pipelines?

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

Malicious package

bumdnlerRubyGems

Advisory published Sep 22, 2026Updated Sep 24, 2026

bumdnler is a confirmed malicious RubyGems package (MAL-2026-16871) that executes malicious code on install (malicious versions 1.0.0, 1.0.50246). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in bumdnler (RubyGems)

MAL-2026-16871

Immediate action

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

gem uninstall bumdnler

Malicious versions

2 flagged

1.0.01.0.50246

Indicators of compromise (SHA-256)

8d787f223ac82c5edbafcb637e10bf4e7742a17a70e5cf4ef0b62cec2aa63221

Detection & response playbook

Malicious package

Find it
Search your lockfiles and build artifacts for bumdnler (2 malicious versions).
If you installed it — respond
Remove bumdnler 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 bumdnler 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. bumdnler on RubyGems has been identified as a malicious package (versions 1.0.0, 1.0.50246 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

RLMA-2026-07557

Credits

ReversingLabs · finder

Detect & block this

O3 blocks bumdnler-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

All malware advisories How O3 detects malware Vulnerability database