How severe is CVE-2026-33155?

CVE-2026-33155 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-33155 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (36th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-33155?

CVE-2026-33155 affects Qluster Deepdiff. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-33155?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-33155 have an EU (EUVD) identifier?

Yes. CVE-2026-33155 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-13792.

When was CVE-2026-33155 published?

CVE-2026-33155 was published on 2026-03-20 and last updated on 2026-06-17.

CVE-2026-33155

CVE-2026-33155 is a high-severity vulnerability in Qluster Deepdiff with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-770.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v4: 8.7
EPSS exploit prediction: 0% (36th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-13792
Weakness: CWE-770
Affected product: Qluster Deepdiff
Published: 2026-03-20
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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.
How severe is CVE-2026-33155?: CVE-2026-33155 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-33155 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (36th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-33155?: CVE-2026-33155 affects Qluster Deepdiff. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-33155?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-33155 have an EU (EUVD) identifier?: Yes. CVE-2026-33155 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-13792.
When was CVE-2026-33155 published?: CVE-2026-33155 was published on 2026-03-20 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:qluster:deepdiff:*:*:*:*:*:*:*:*

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