Which versions of fmt-date-lite are malicious?

The following npm versions of fmt-date-lite are flagged malicious: 1.0.0. Treat any of these as compromised.

How do I remediate fmt-date-lite if I installed it?

fmt-date-lite 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.

I already installed fmt-date-lite — how do I know if it already compromised me?

If fmt-date-lite 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 fmt-date-lite part of a known attack campaign?

Yes — fmt-date-lite is associated with the IN-MAL-2026-009605 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 fmt-date-lite 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 fmt-date-lite (version 1.0.0). O3 Security's supply-chain scanner checks every dependency against known-malicious package intelligence at install time and in CI, flagging fmt-date-lite across your stack and pipelines.

Malicious package

fmt-date-litenpm

fmt-date-lite is a confirmed malicious npm package (MAL-2026-10115) that steals credentials and exfiltrates sensitive data (malicious version 1.0.0). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in fmt-date-lite (npm)

MAL-2026-10115

Immediate action

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

npm uninstall fmt-date-lite

What this malware does

The npm package fmt-date-lite is a supply-chain dropper disguised as a benign date-formatting utility (its description reads "Lightweight date formatting utility with locale support"). It ships six files, no source repository and no dependencies, with its real behaviour in an install script.

A postinstall lifecycle hook (postinstall: node postinstall.js) executes automatically on npm install, before the package is ever imported. The install script fetches a second-stage payload from the hardcoded external endpoint 155.190.124.243:6788 and executes it via a Node child process (child_process / execSync) — the classic download-and-execute pattern. Any developer workstation or CI runner that installs the package (directly or transitively) hands arbitrary code execution to the operator of that endpoint.

fmt-date-lite is part of a coordinated campaign of near-identical "date/time formatting utility" droppers: sibling packages reuse the same shell and point at raw-IP infrastructure in the same 115-155.190.124.0/8 neighbourhood — e.g. datefmt-helper (C2 115.190.124.243) and date-fns-lite (C2 115.190.124.243, catalogued as OSV MAL-2026-6722).

Detected and classified independently by codelake Research from the live npm feed; at the time of reporting fmt-date-lite was not present in OSV or GHSA (a first-catch).

On npm install, the package's postinstall lifecycle script runs the id command and transmits the resulting user/group identity to a hardcoded bare-IP endpoint at http://155.190.124.243:6788/ over plain HTTP. Three fallback delivery mechanisms are used (node http.get, curl, wget) to maximize the chance of successful exfiltration across environments. This behavior has no legitimate connection to the package's advertised purpose (a date-formatting utility), and the benign-sounding name and date-fns-lite authorship function as cover for the install-time beacon — consistent with a lure/typosquat targeting the date-fns ecosystem. The id output reveals the installer's username, UID, GID, and group memberships, providing reconnaissance for follow-on attacks and confirming the callback for the operator.

Malicious versions

1 flagged

1.0.0

Indicators of compromise (SHA-256)

1c8dad7bd90f4cb0dbb1d4ce933bc39f04aefe4940a53605e5c3f30c48a313e4

Detection & response playbook

Credential / info stealer

Find it
Scan your lockfiles (package-lock.json, pnpm-lock.yaml, yarn.lock, requirements.txt, poetry.lock, etc.) and build artifacts for fmt-date-lite (version 1.0.0). O3 Security's supply-chain scanner checks every dependency against known-malicious package intelligence at install time and in CI, flagging fmt-date-lite across your stack and pipelines.
If you installed it — respond
fmt-date-lite 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.
Did it already run?
If fmt-date-lite 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 fmt-date-lite 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. fmt-date-lite on npm has been identified as a malicious package (version 1.0.0 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-009605

References

Credits

Amazon Inspector · finder
codelake Research · finder

Detect & block this

O3 blocks fmt-date-lite-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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