CVE-2026-33155: Qluster Deepdiff

High severity, CVSS 7.5. EPSS: 0.5% chance of exploitation in the next 30 days.

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.

Affected products

• Qluster Deepdiff: from 5.0.0, before 8.6.2 (fixed in 8.6.2)

Published 2026-03-20. Last modified 2026-06-17.