json-mapping-fetchnpm
Advisory published Updated
json-mapping-fetch is a confirmed malicious npm package (MAL-2026-2367) that executes malicious code on install (malicious version 2.4.3). Do not install it — remove it immediately and rotate any exposed credentials.
Malicious code in json-mapping-fetch (npm)
What this malware does
The package json-mapping-fetch was found to contain malicious code.
Malicious versions
Indicators of compromise (SHA-256)
Detection & response playbook
Malicious packageFind it
Search your lockfiles and build artifacts for json-mapping-fetch (version 2.4.3).
If you installed it — respond
Remove json-mapping-fetch 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 json-mapping-fetch 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
Campaign
Credits
- Amazon Inspector · finder
- ReversingLabs · finder
Detect & block this
O3 blocks json-mapping-fetch-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.