CVE-2026-2769 is a use-after-free vulnerability classified under CWE-416 affecting the Storage: IndexedDB component in Mozilla Firefox. This vulnerability allows for potential memory corruption issues that could be exploited to impact confidentiality, integrity, and availability of the affected software. The vulnerability was addressed and fixed in Firefox 148, Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8. The Mozilla Foundation has published security advisories (MFSA2026-13 and MFSA2026-14) detailing this and other related memory safety bugs fixed in these releases. 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, unchanged scope, and high impact on confidentiality, integrity, and availability.

Successful exploitation of this use-after-free vulnerability could allow an attacker to execute arbitrary code, cause memory corruption, or crash the application, leading to potential compromise of user data or system stability. The high CVSS score reflects the significant risk posed by this vulnerability if left unpatched.

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 mitigate the risk. No additional mitigation steps are required beyond applying the official patches.