CVE-2025-71373: picklescan - Remote Code Execution via operator.methodcaller Detection Bypass

Severity: high (CVSS 8.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-04 · updated 2026-10-12
Weakness: CWE-693

Description

picklescan before 0.0.33 fails to detect operator.methodcaller function calls in pickle files, allowing attackers to bypass security checks. Remote attackers can craft malicious pickle payloads using operator.methodcaller that execute arbitrary code when loaded, compromising systems relying on picklescan for validation.

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-x843-g5mx-g377
https://www.vulncheck.com/advisories/picklescan-remote-code-execution-via-operator-methodcaller-detection-bypass
https://github.com/mmaitre314/picklescan/security/advisories/GHSA-x843-g5mx-g377

Get alerted when CVE-2025-71373 or the next vulnerability affects your stack