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Malicious package

@carvana.authentication-flows/sharednpm

Advisory published Updated

@carvana.authentication-flows/shared is a confirmed malicious npm package (MAL-2026-6521) that steals credentials and exfiltrates sensitive data (malicious version 19.2.1). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in @carvana.authentication-flows/shared (npm)

MAL-2026-6521
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
npm uninstall @carvana.authentication-flows/shared

What this malware does

package.json declares a preinstall hook (node index.js) that runs unconditionally on npm install. index.js imports child_process/os/https, collects host identifiers (os.hostname, os.userInfo, platform, arch, homedir, cwd) and shells out to whoami/id, then POSTs the collected JSON to a hardcoded Burp Collaborator subdomain at https://pleq9pugrugzr4zgyymazmnq0h68u4it.oastify.com/detox56. The package name also impersonates the Carvana org by using a . in the scope (@carvana.authentication-flows/shared), making carvana.authentication-flows a fake top-level npm scope rather than a Carvana-owned namespace. There is no legitimate functionality shipped; the package's sole effect on install is reconnaissance exfiltration to an attacker-controlled out-of-band server.

Malicious versions

1 flagged
19.2.1

Indicators of compromise (SHA-256)

78538bf70d1ebd3e4cd784d90b3961ea7966ce9b97e8124110374cad95c0b894

Detection & response playbook

Credential / info stealer

  1. Find it

    Search your lockfiles and build artifacts for @carvana.authentication-flows/shared (version 19.2.1).

  2. If you installed it — respond

    @carvana.authentication-flows/shared is built to steal secrets, so assume every credential the build or runtime could read is compromised. Remove it from your project and lockfile, then rotate ALL exposed secrets — npm/registry tokens, cloud keys, CI/CD secrets, SSH keys, and any .env values — from a known-clean machine. Audit logs for unauthorized use of those credentials.

  3. Did it already run?

    If @carvana.authentication-flows/shared 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. @carvana.authentication-flows/shared on npm has been identified as a malicious package (version 19.2.1 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-007608

References

Credits

  • Amazon Inspector · finder

Detect & block this

O3 blocks @carvana.authentication-flows/shared-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the credential exfiltration and severs the channel.

Malware detection Runtime egress monitoring

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@carvana.authentication-flows/shared (npm) malicious package — MAL-2026-6521 | O3 Security