Which versions of buniler are malicious?

The following RubyGems versions of buniler are flagged malicious: 1.0.0, 1.0.58652. Treat any of these as compromised.

How do I remediate buniler if I installed it?

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

If buniler 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 buniler part of a known attack campaign?

Yes — buniler is associated with the RLMA-2026-07720 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 buniler across my projects, lockfiles, and CI pipelines?

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

Malicious package

bunilerRubyGems

Advisory published Sep 22, 2026Updated Sep 24, 2026

buniler is a confirmed malicious RubyGems package (MAL-2026-17034) that executes malicious code on install (malicious versions 1.0.0, 1.0.58652). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in buniler (RubyGems)

MAL-2026-17034

Immediate action

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

gem uninstall buniler

Malicious versions

2 flagged

1.0.01.0.58652

Indicators of compromise (SHA-256)

1971bc8c541c546fc68242d18bef92cdd901962c877fdf616d6e50675b44e5d5

Detection & response playbook

Malicious package

Find it
Search your lockfiles and build artifacts for buniler (2 malicious versions).
If you installed it — respond
Remove buniler 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 buniler 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. buniler on RubyGems has been identified as a malicious package (versions 1.0.0, 1.0.58652 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

RLMA-2026-07720

Credits

ReversingLabs · finder

Detect & block this

O3 blocks buniler-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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