Attack Chain

1. An attacker crafts a malicious website designed to trigger the WebRTC vulnerability.
2. The victim visits the malicious website using a vulnerable version of Chrome or Edge.
3. The website uses JavaScript to initiate a WebRTC session.
4. The crafted WebRTC data triggers a heap buffer overflow during memory allocation within the WebRTC component.
5. The overflow overwrites adjacent memory regions on the heap.
6. The attacker carefully crafts the overflow data to overwrite critical program data or function pointers.
7. The corrupted data leads to arbitrary code execution within the context of the browser process.
8. The attacker gains control of the user’s browser and potentially the underlying system.

Impact

Successful exploitation of CVE-2026-7339 can lead to arbitrary code execution, allowing an attacker to potentially install malware, steal sensitive information, or take control of the affected system. Given the widespread use of Chrome and Edge, this vulnerability could impact a large number of users across various sectors, including individuals, businesses, and government organizations.

Recommendation

• Apply the latest security updates for Google Chrome and Microsoft Edge (Chromium-based) to patch CVE-2026-7339.
• Deploy the Sigma rule “Detect WebRTC Heap Overflow Attempt” to identify potential exploitation attempts targeting CVE-2026-7339.
• Monitor web server logs for unusual requests or patterns associated with WebRTC usage that could indicate exploitation attempts.