AIKIDO-2026-520310
vcrpy is vulnerable to Deserialization of Untrusted Data
78
High Risk
This Affects:
vcrpyTL;DR
The vcrpy library loads YAML cassette files through PyYAML's full loader in vcr/serializers/yamlserializer.py and vcr/migration.py. A crafted cassette containing !!python/object/apply tags executes arbitrary Python code when loaded through VCR().use_cassette(), before any HTTP replay occurs. This can compromise CI runners and developer machines that load attacker-supplied cassettes from pull requests, shared fixture repositories, or poisoned artifacts. The fix uses a safe loader with an allowlist of benign constructors so dangerous Python object tags are rejected while legitimate cassettes continue to load.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range.
Background info
vcrpy is vulnerable to Deserialization of Untrusted Data in versions 0.0.1 - 8.2.0.
How to fix this
Upgrade the vcrpy library to the patch version.
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SOC 2Compliant
ISO 27001Compliant