Which versions of bunlder-lib are malicious?

The following RubyGems versions of bunlder-lib are flagged malicious: 1.0.32275. Treat any of these as compromised.

How do I remediate bunlder-lib if I installed it?

Remove bunlder-lib 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 bunlder-lib — how do I know if it already compromised me?

If bunlder-lib 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 bunlder-lib part of a known attack campaign?

Yes — bunlder-lib is associated with the RLMA-2026-07743 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 bunlder-lib across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for bunlder-lib (version 1.0.32275).

Malicious package

bunlder-libRubyGems

Advisory published Sep 22, 2026Updated Sep 24, 2026

bunlder-lib is a confirmed malicious RubyGems package (MAL-2026-17057) that executes malicious code on install (malicious version 1.0.32275). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in bunlder-lib (RubyGems)

MAL-2026-17057

Immediate action

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

gem uninstall bunlder-lib

Malicious versions

1 flagged

1.0.32275

Indicators of compromise (SHA-256)

86398385f5fe8bd44f112aa9153e9212ce673324c03eb86de80c9882de04187c

Detection & response playbook

Malicious package

Find it
Search your lockfiles and build artifacts for bunlder-lib (version 1.0.32275).
If you installed it — respond
Remove bunlder-lib 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 bunlder-lib 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. bunlder-lib on RubyGems has been identified as a malicious package (version 1.0.32275 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

RLMA-2026-07743

Credits

ReversingLabs · finder

Detect & block this

O3 blocks bunlder-lib-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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