CVE-2025-71376: picklescan - Arbitrary Code Execution via Undetected idlelib.autocomplete.AutoComplete.fetch_completions

Severity: high (CVSS 8.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-06-23 · updated 2026-10-12
Weakness: CWE-502

Description

picklescan before 0.0.29 fails to detect malicious pickle files using idlelib.autocomplete.AutoComplete.fetch_completions in reduce methods. Attackers can embed undetected code in pickle files that executes arbitrary commands when loaded by victims.

Affected products

picklescan: before 0.0.29 — fixed in 0.0.29

How to fix

Upgrade to a fixed version: picklescan 0.0.29. Check the vendor advisory for mitigations.

References

https://github.com/mmaitre314/picklescan/security/advisories/GHSA-7cq8-mj8x-j263
https://www.vulncheck.com/advisories/picklescan-arbitrary-code-execution-via-undetected-idlelib-autocomplete-autocomplete-fetch-completions
https://github.com/mmaitre314/picklescan/security/advisories/GHSA-7cq8-mj8x-j263

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