TI-2026-25585 Aliases CVE-2026-33155 GHSA-54jj-px8x-5w5q

DeepDiff has Memory Exhaustion DoS through SAFE_TO_IMPORT

HIGH 77CWE-400Published 2026-03-20 · Updated 2026-03-24

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: Partial Red Hat: 2 without a fix

Attack profile from CVSS 4.0 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-400.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00471 40th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Partial deepdiff (seperman): 8.6.2deepdiff (PyPI): 8.6.2Red Hat: 2 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
seperman	deepdiff	5.0.0 to before 8.6.2	8.6.2	Patch available	CNA
—	deepdiff (PyPI)	5.0.0 to before 8.6.2	8.6.2	Patch available	GHSA-54jj-px8x-5w5q

deepdiff Vendorseperman Affected 5.0.0 to before 8.6.2 Fixed in 8.6.2 Patch available CNA
deepdiff (PyPI) Vendor— Affected 5.0.0 to before 8.6.2 Fixed in 8.6.2 Patch available GHSA-54jj-px8x-5w5q

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:qluster:deepdiff::::::::	5.0.0 to before 8.6.2	Vulnerable	Qluster

cpe:2.3:a:qluster:deepdiff:*:*:*:*:*:*:*:* Versions 5.0.0 to before 8.6.2 Vulnerable ·Qluster

Remediation

Fix · CNA deepdiff (seperman) Fixed in 8.6.2
Fix · GHSA-54jj-px8x-5w5q deepdiff (PyPI) Fixed in 8.6.2 Advisory →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

Product	Status	Plan or fix
Pen Drive Powered by Red Hat Lightspeed	Affected	No fix yet: Fix deferred
Red Hat OpenShift AI (RHOAI)	Affected	No fix yet: Fix deferred

Timeline

2026-10-02 Threatist record created from CVE-2026-33155
2026-10-03 Alias added: GHSA-54jj-px8x-5w5q

References

TI-2025-36155 DeepDiff is vulnerable to DoS and Remote Code Execution via Delta class pollution CVSS 4.0CRITICAL 10.0

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences