JavaScript Engine vulnerabilities

CVE-2026-2786 involves a use-after-free vulnerability in the JavaScript Engine component. It has been fixed in Firefox 148, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.

A use-after-free vulnerability was discovered in the JavaScript Engine component of Firefox and Thunderbird. It is fixed in Firefox 148, Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.

When a JavaScript template literal contains consecutive expressions, context tracking state was not properly reset upon entering a new expression. Now template-literal expression entries correctly reset context variables so all subsequent regular expression literals are accurately recognized and escaped.

An unspecified vulnerability was discovered in the JavaScript Engine component of Firefox and Thunderbird. The flaw is fixed in Firefox 150.0.3, Firefox ESR 115.36, Firefox ESR 140.11, and Thunderbird 140.11.