Which versions of js-multer are malicious?

Every published version of js-multer on npm is considered malicious. Remove the package entirely.

How do I remediate js-multer if I installed it?

Remove js-multer 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 js-multer — how do I know if it already compromised me?

If js-multer was ever installed, its post-install/runtime payload may have already executed. O3's L7 egress monitoring and runtime eBPF sensors detect the credential exfiltration or command-and-control callback after install and block the malicious outbound channel, so you catch and contain the actual compromise — not just the presence of the package.

Is js-multer part of a known attack campaign?

Yes — js-multer is associated with the GHSA-qr75-8mp9-xxfp 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 js-multer across my projects, lockfiles, and CI pipelines?

Scan your lockfiles (package-lock.json, pnpm-lock.yaml, yarn.lock, requirements.txt, poetry.lock, etc.) and build artifacts for js-multer (all published versions). O3 Security's supply-chain scanner checks every dependency against known-malicious package intelligence at install time and in CI, flagging js-multer across your stack and pipelines.

Malicious package

js-multernpm

Malicious code in js-multer (npm) Remove it immediately and rotate any exposed credentials.

MAL-2026-1016

Immediate action

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

npm uninstall js-multer

What this malware does

The package js-multer was found to contain malicious code.

Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.

Malicious versions

all versions

Every published version of this package is considered malicious — remove it entirely.

Indicators of compromise (SHA-256)

330a991375f32abf73368d5d321c5a485cd844db42ccaa02388ebe61bc013376

50fbd8b0061a32bc73c0f643e53d0522b03117bda560c40b279b8cdebe5a1100

Detection & response playbook

Malicious package

Find it
Scan your lockfiles (package-lock.json, pnpm-lock.yaml, yarn.lock, requirements.txt, poetry.lock, etc.) and build artifacts for js-multer (all published versions). O3 Security's supply-chain scanner checks every dependency against known-malicious package intelligence at install time and in CI, flagging js-multer across your stack and pipelines.
If you installed it — respond
Remove js-multer 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 js-multer was ever installed, its post-install/runtime payload may have already executed. O3's L7 egress monitoring and runtime eBPF sensors detect the credential exfiltration or command-and-control callback after install and block the malicious outbound channel, so you catch and contain the actual compromise — not just the presence of the package.
How O3 protects you
O3 blocks js-multer before install through its supply-chain scanner, and if it has already run, detects and severs the exfiltration or C2 callback at runtime through L7 egress monitoring and eBPF.

Frequently asked questions

No. js-multer on npm has been identified as a malicious package (all published versions flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

GHSA-qr75-8mp9-xxfp

References

github.com

Credits

Amazon Inspector · finder

Detect & block this

O3 blocks js-multer-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