CVE-2026-6747 is a use-after-free vulnerability affecting the WebRTC component in Mozilla Firefox. Use-after-free bugs occur when a program continues to use a pointer after the memory it points to has been freed, potentially leading to memory corruption and exploitation. Mozilla fixed this vulnerability in Firefox 150 and Firefox ESR 140.10. The vendor advisories classify the impact as high and indicate that the vulnerability was reported by Nan Wang. No specific CVSS score is provided, but the impact is considered high based on the vendor's assessment.

The vulnerability allows for use-after-free conditions in the WebRTC component, which can lead to memory corruption. Such memory corruption issues can potentially be exploited to execute arbitrary code or cause application crashes. However, there are no known exploits in the wild for this vulnerability as of the advisory date. The impact is rated high by Mozilla, reflecting the serious nature of use-after-free vulnerabilities in browser components.

Mozilla has released official fixes for this vulnerability in Firefox 150 and Firefox ESR 140.10. Users and administrators should update affected Firefox installations to these versions or later to remediate the issue. Since this is not a cloud service, remediation depends on applying the vendor's official patches. Patch status is confirmed by Mozilla advisories. No additional mitigation steps are indicated beyond updating to the fixed versions.