react-refresh-updatenpm
Advisory published Updated
react-refresh-update is a confirmed malicious npm package (MAL-2026-1485) that executes malicious code on install. Do not install it — remove it immediately and rotate any exposed credentials.
Malicious code in react-refresh-update (npm)
What this malware does
Package contains highly obfuscated code with dynamic execution using eval(), a strong indicator of malicious intent. YARA rule matches confirm.
The package react-refresh-update was found to contain malicious code.
Malicious versions
Every published version of this package is considered malicious — remove it entirely.
Indicators of compromise (SHA-256)
Detection & response playbook
Malicious packageFind it
Search your lockfiles and build artifacts for react-refresh-update (all published versions).
If you installed it — respond
Remove react-refresh-update 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 react-refresh-update 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
References
Credits
- Amazon Inspector · finder
- SafeDep · finder
Detect & block this
O3 blocks react-refresh-update-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.