CVE-2026-100788

Invalid pointer in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, and Firefox ESR 140.17.

Published Sep 29, 2026
CVSS 9.8 critical
0.4% chance of exploitation in the next 30 days (EPSS)
A fix is available

Affected software

In the news

Multiple vulnerabilities in Mozilla Thunderbird CERT-FR · Oct 1, 2026
Multiple vulnerabilities in Mozilla products CERT-FR · Sep 30, 2026

CVE-2026-100788 at the National Vulnerability Database