CVE-2026-100817

Other issue in the JavaScript: WebAssembly component. This vulnerability was fixed in Thunderbird 157 and Firefox 157.

Published Sep 29, 2026
CVSS 5.4 medium
0.2% 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-2026-100817 at the National Vulnerability Database