CVE-2026-2770 is a use-after-free vulnerability classified under CWE-416 affecting the DOM: Bindings (WebIDL) component in Mozilla Firefox. This vulnerability allows memory to be freed prematurely and subsequently accessed, which can lead to memory corruption. The issue was resolved by Mozilla in Firefox 148 and Firefox ESR 115.33. The CVSS v3.1 base score is 8.8, indicating a high severity with network attack vector, low attack complexity, no privileges required, user interaction required, and impacts on confidentiality, integrity, and availability. The vendor advisory explicitly states the fix is included in Firefox 148 and ESR 115.33 releases.

The vulnerability can result in memory corruption that may be exploited to execute arbitrary code, leading to full compromise of the affected Firefox browser. The high CVSS score reflects the critical nature of the impact on confidentiality, integrity, and availability of the system running the vulnerable software. No known exploits in the wild have been reported at the time of publication.

Mozilla has released official fixes for this vulnerability in Firefox 148 and Firefox ESR 115.33. Users and administrators should upgrade to these or later versions to remediate the issue. Since this is a client-side application vulnerability, applying the official update is the recommended and effective mitigation. Patch status is confirmed by the vendor advisory.