CVE-2025-71375 — picklescan before 0.0.34 fails to detect the _operator.methodcaller built-in function when scanning pickle files for malicious code

Matched remediation archetype

Unsafe deserialization and object reconstruction

This catalog composition supplies bounded fallback guidance. Explicitly reviewed curated workflows load with the complete record below.

Check exposure

• Inventory serialization formats accepted from requests, queues, caches, files, cookies, and cross-service messages.
• Trace whether untrusted input can select classes, types, callbacks, constructors, or object hooks during decoding.
• Identify signing, schema validation, trust-boundary, and compatibility settings for each decoder.

Remediate safely

• Replace native object deserialization with a data-only format and explicit schema validation.
• If replacement is not immediate, use a safe decoder with a minimal type allowlist and disable polymorphic or executable hooks.
• Update the affected library and add inert tests for unknown types, extra fields, malformed nesting, and unsigned data.