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PYSEC-2026-225

Details

picklescan before 1.0.1 contains an unsafe pickle deserialization vulnerability allowing unauthenticated attackers to create arbitrary zero-byte files via logging.FileHandler class instantiation. Attackers can exploit this by crafting malicious pickle payloads to bypass RCE blocklists and create lock files or other filesystem artifacts, potentially causing denial of service or application disruption.

Are you affected?

Enter the version of the package you're using.

Affected packages

PyPI / picklescan

Introduced in: 0 Fixed in: 1.0.1

Fix pip install --upgrade 'picklescan>=1.0.1'

References

https://www.vulncheck.com/advisories/picklescan-arbitrary-file-creation-via-logging-filehandler-deserialization [ADVISORY]
https://github.com/mmaitre314/picklescan/security/advisories/GHSA-m7j5-r2p5-c39r [EVIDENCE]