Bug 2449786 (CVE-2026-33155) - CVE-2026-33155 deepdiff: python: DeepDiff: Denial of Service via unrestricted memory allocation in pickle unpickler
Summary: CVE-2026-33155 deepdiff: python: DeepDiff: Denial of Service via unrestricted...
Keywords:
Status: NEW
Alias: CVE-2026-33155
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
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Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-03-20 21:02 UTC by OSIDB Bzimport
Modified: 2026-03-23 09:16 UTC (History)
4 users (show)

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Description OSIDB Bzimport 2026-03-20 21:02:48 UTC 
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.
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