Mozilla · Firefox · CVE-2026-100796
**Name of the Vulnerable Software and Affected Versions**
Firefox versions prior to 157
Thunderbird versions prior to 157
**Description**
A use-after-free issue exists in the JavaScript: WebAssembly component. Use-after-free is a memory corruption flaw that occurs when an application continues to use a pointer after it has been freed.
**Recommendations**
Update Firefox to version 157 or later.
Update Thunderbird to version 157 or later.