msgpackrpc (PyPI) · Malicious Code
Affects msgpackrpcSource GCVE Database
Malicious package : remove msgpackrpc and rotate any secrets on hosts that installed it.
Data as of 4 Nov 2026, 20:00 UTC
Malicious package
Published to PyPI · OSV MAL-2026-18627
What to do
Remove msgpackrpc from every project, lockfile and image that pulls it in. Treat any host that installed it as compromised: rotate the credentials, tokens and keys it could read, from a clean machine.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| PyPImsgpackrpc | Affected
| Fixed in– |
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Description
The msgpackrpc package on PyPI contains malicious code that exfiltrates basic host information such as IP address and username upon installation or import. The package overrides the install command in setup.py to execute this malicious code. It serves no legitimate purpose beyond this data exfiltration.