Which versions of fontcase are malicious?

The following PyPI versions of fontcase are flagged malicious: 0.1.0, 0.1.1, 0.1.2. Treat any of these as compromised.

How do I remediate fontcase if I installed it?

fontcase 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 fontcase — how do I know if it already compromised me?

If fontcase 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.

Is fontcase part of a known attack campaign?

Yes — fontcase is associated with the 2026-10-fontcase 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 fontcase across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for fontcase (3 malicious versions).

Malicious package

fontcasePyPI

Advisory published Oct 13, 2026Updated Oct 13, 2026

fontcase is a confirmed malicious PyPI package (MAL-2026-17862) that steals credentials and exfiltrates sensitive data (malicious versions 0.1.0, 0.1.1, 0.1.2). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in fontcase (PyPI)

MAL-2026-17862

Immediate action

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

pip uninstall fontcase

What this malware does

During import, the package downloads and executes an infostealer.

Category: MALICIOUS - The campaign has clearly malicious intent, like infostealers.

Campaign: 2026-10-fontcase

Reasons (based on the campaign):

infostealer
Downloads and executes a remote executable.
uses-telegram-bot
exfiltration-browser-data
exfiltration-credentials

Malicious versions

3 flagged

0.1.00.1.10.1.2

Indicators of compromise (SHA-256)

9e2c4992e5295f2b094f3c7c2b2e6c2dbc8d0d9ca6242d58318e6e1b83a4255c

Detection & response playbook

Credential / info stealer

Find it
Search your lockfiles and build artifacts for fontcase (3 malicious versions).
If you installed it — respond
fontcase 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 fontcase 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. fontcase on PyPI has been identified as a malicious package (versions 0.1.0, 0.1.1, 0.1.2 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

2026-10-fontcase

References

Credits

Kamil Mańkowski (kam193) · reporter

Detect & block this

O3 blocks fontcase-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

Explore

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