Vulnerability Description
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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Qluster | Deepdiff | >= 5.0.0, < 8.6.2 |
Related Weaknesses (CWE)
References
- https://github.com/qlustered/deepdiff/commit/0d07ec21d12b46ef4e489383b363eadc22dPatch
- https://github.com/qlustered/deepdiff/security/advisories/GHSA-54jj-px8x-5w5qExploitVendor Advisory
FAQ
What is CVE-2026-33155?
CVE-2026-33155 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 loa...
How severe is CVE-2026-33155?
CVE-2026-33155 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-33155?
Check the references section above for vendor advisories and patch information. Affected products include: Qluster Deepdiff.