Which versions of sympy-dev are malicious?

The following PyPI versions of sympy-dev are flagged malicious: 1.2.3, 1.2.4, 1.2.5, 1.2.6. Treat any of these as compromised.

How do I remediate sympy-dev if I installed it?

sympy-dev is a typosquat — you almost certainly intended a legitimately-named package. Remove sympy-dev, install the correct package, and rotate any secrets exposed during the install since post-install scripts may have already run.

I already installed sympy-dev — how do I know if it already compromised me?

If sympy-dev 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.

How do I find sympy-dev across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for sympy-dev (4 malicious versions).

Malicious package

sympy-devPyPI

Advisory published Jan 22, 2026Updated Jan 22, 2026

sympy-dev is a confirmed malicious PyPI package (MAL-2026-450) that typosquats a legitimate package to trick installs (malicious versions 1.2.3, 1.2.4, 1.2.5…). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in sympy-dev (PyPI)

MAL-2026-450

Immediate action

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

pip uninstall sympy-dev

What this malware does

Package downloads and executes code from remote servers, indicating malicious behavior. Multiple files and IPs involved. Package impersonates popular sympy package.

Malicious versions

4 flagged

1.2.31.2.41.2.51.2.6

Detection & response playbook

Typosquat

Find it
Search your lockfiles and build artifacts for sympy-dev (4 malicious versions).
If you installed it — respond
sympy-dev is a typosquat — you almost certainly intended a legitimately-named package. Remove sympy-dev, install the correct package, and rotate any secrets exposed during the install since post-install scripts may have already run.
Did it already run?
If sympy-dev 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. sympy-dev on PyPI has been identified as a malicious package (versions 1.2.3, 1.2.4, 1.2.5, 1.2.6 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

References

app.safedep.io

Credits

SafeDep · finder

Detect & block this

O3 blocks sympy-dev-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.

Malware detection Runtime egress monitoring

Explore

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