CVE-2026-2769 Use-after-free in the Storage: IndexedDB component
A use-after-free flaw in Firefox's IndexedDB component allows attackers to execute arbitrary code, requiring users to upgrade to patched versions.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-2769?
CVE-2026-2769 is a high-severity use after free vulnerability in Mozilla Firefox, published on 24 Feb 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Use-after-free in the Storage: IndexedDB component. This vulnerability was fixed in Firefox 148, Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.
Weakness: CWE-416
Which versions are affected by CVE-2026-2769?
It affects 2 products.
Products include Mozilla Firefox, Mozilla Thunderbird.
How do I fix CVE-2026-2769?
Upgrade to a fixed version.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-2769 being exploited?
There is no known exploitation of CVE-2026-2769 in the wild and no public exploit code.
Other vulnerabilities in Mozilla Firefox
Sources
Also known as DEBIAN-CVE-2026-2769, GHSA-h67m-x9c3-v9wp, UBUNTU-CVE-2026-2769.