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9.8
Firefox and Thunderbird can crash or run malicious code
CVE-2026-2796
Summary
A security issue in the JavaScript: WebAssembly component of Firefox and Thunderbird can cause the browser or email client to crash or allow malicious code to run. This affects users of Firefox and Thunderbird versions less than 148. Update to the latest version to fix the issue.
What to do
No fix is available yet. Check with your software vendor for updates.
Affected software
| Vendor | Product | Affected versions | Fix available |
|---|---|---|---|
| mozilla | firefox | <= 148.0 | – |
| mozilla | thunderbird | <= 148.0 | – |
Original title
JIT miscompilation in the JavaScript: WebAssembly component. This vulnerability affects Firefox < 148 and Thunderbird < 148.
Original description
JIT miscompilation in the JavaScript: WebAssembly component. This vulnerability affects Firefox < 148 and Thunderbird < 148.
nvd CVSS3.1
9.8
Vulnerability type
CWE-843
Type Confusion
- https://bugzilla.mozilla.org/show_bug.cgi?id=2013165 Permissions Required
- https://www.mozilla.org/security/advisories/mfsa2026-13/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-16/ Vendor Advisory
Published: 24 Feb 2026 · Updated: 12 Mar 2026 · First seen: 6 Mar 2026