CVE-2026-2769 is a use-after-free vulnerability classified under CWE-416 affecting the Storage: IndexedDB 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. This vulnerability was resolved in Firefox 148, Firefox ESR 115.33, and Firefox ESR 140.8, as well as Thunderbird 148 and 140.8. The CVSS 3.1 base score is 8.8, indicating a high impact with network attack vector, low attack complexity, no privileges required, user interaction required, and high impact on confidentiality, integrity, and availability. The vendor advisory confirms the fix and recommends updating to the patched versions.

Successful exploitation of this use-after-free vulnerability could lead to memory corruption, which may allow an attacker to execute arbitrary code, cause denial of service, or compromise confidentiality and integrity of user data. The CVSS score of 8.8 reflects a high impact on affected systems. However, there are no known exploits in the wild at the time of publication.

Mozilla has released official fixes for this vulnerability in Firefox 148, Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8. Users and administrators should update to these versions or later to remediate this vulnerability. No additional mitigation steps are required beyond applying the official patches.