CVE-2025-71320: picklescan - Remote Code Execution via Incomplete Disallowed Inputs

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-06-17 · updated 2026-10-12
Weakness: CWE-184

Description

picklescan before 0.0.33 contains an incomplete deny-list that fails to block pydoc.locate and operator.methodcaller functions, allowing attackers to bypass security checks. Remote attackers can craft malicious pickle files using these unblocked functions to achieve arbitrary code execution when the pickle is deserialized.

Affected products

picklescan: before 0.0.33 — fixed in 0.0.33

How to fix

Upgrade to a fixed version: picklescan 0.0.33. Check the vendor advisory for mitigations.

References

https://github.com/mmaitre314/picklescan/security/advisories/GHSA-84r2-jw7c-4r5q
https://www.vulncheck.com/advisories/picklescan-remote-code-execution-via-incomplete-disallowed-inputs
https://github.com/mmaitre314/picklescan/security/advisories/GHSA-84r2-jw7c-4r5q

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