Which versions of bimdler are malicious?

The following RubyGems versions of bimdler are flagged malicious: 1.0.0, 1.0.88477. Treat any of these as compromised.

How do I remediate bimdler if I installed it?

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

If bimdler 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 bimdler part of a known attack campaign?

Yes — bimdler is associated with the RLMA-2026-07261 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 bimdler across my projects, lockfiles, and CI pipelines?

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

Malicious package

bimdlerRubyGems

Advisory published Sep 22, 2026Updated Sep 24, 2026

bimdler is a confirmed malicious RubyGems package (MAL-2026-16602) that executes malicious code on install (malicious versions 1.0.0, 1.0.88477). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in bimdler (RubyGems)

MAL-2026-16602

Immediate action

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

gem uninstall bimdler

Malicious versions

2 flagged

1.0.01.0.88477

Indicators of compromise (SHA-256)

0fcc6de744cf8dd547afcbe9e6880a22d6e61b9bb0e374530716f6e4781337b6

Detection & response playbook

Malicious package

Find it
Search your lockfiles and build artifacts for bimdler (2 malicious versions).
If you installed it — respond
Remove bimdler 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 bimdler 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. bimdler on RubyGems has been identified as a malicious package (versions 1.0.0, 1.0.88477 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

RLMA-2026-07261

Credits

ReversingLabs · finder

Detect & block this

O3 blocks bimdler-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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