Resource exhaustion in Qluster Deepdiff
CVE-2026-33155
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.
Vulnerability class: DoS (Denial of Service)
EPSS: 0.005 (37.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Qluster Deepdiff
- Seperman Deepdiff — versions >= 5.0.0, < 8.6.2
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-33155?
- CVE-2026-33155 is a high-severity vulnerability in Qluster Deepdiff, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2026-03-20.
- How severe is CVE-2026-33155?
- High severity. CVSS v3 base score is 7.5 out of 10.