CVE-2026-92040

Use-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 156 and Thunderbird 156.

• Published Sep 15, 2026
• CVSS 8.8 high
• 0.4% chance of exploitation in the next 30 days (EPSS)
• A fix is available

CVE-2026-92040 at the National Vulnerability Database