Threats affecting pkg:pypi/deepdiff

DeepDiff is a project focused on Deep Difference and search of any Python data. From version 5.0.0 to before version 8.6.2, the pickle unpickler _RestrictedUnpickler validates which classes can be loaded but does not limit their constructor arguments. A few of the types in SAFE_TO_IMPORT have constructors that allocate memory proportional to their input (builtins.bytes, builtins.list, builtins.range). A 40-byte pickle payload can force 10+ GB of memory, which crashes applications that load delta objects or call pickle_load with untrusted data. This issue has been patched in version 8.6.2.

CVE-2025-58367 is a critical vulnerability in the Python DeepDiff library's Delta class that allows class pollution via its constructor. This flaw can be exploited to modify the internal allow list for safe deserialization, enabling insecure Pickle deserialization and potentially arbitrary code execution. The vulnerability also allows denial of service by corrupting built-in classes and may lead to other impacts such as authentication bypass in web applications. The issue affects DeepDiff versions from 5.0.0 up to but not including 8.6.1, with a fix released in version 8.6.1.