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9.8
Firefox and Thunderbird: Malicious Websites Can Crash Browser
CVE-2026-2805
Summary
Versions of Firefox and Thunderbird prior to 148 have a security weakness that allows malicious websites to crash the browser or cause it to behave unexpectedly. This could potentially allow an attacker to disrupt your work or access to sensitive information. 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
Invalid pointer in the DOM: Core & HTML component. This vulnerability affects Firefox < 148 and Thunderbird < 148.
Original description
Invalid pointer in the DOM: Core & HTML component. This vulnerability affects Firefox < 148 and Thunderbird < 148.
nvd CVSS3.1
9.8
Vulnerability type
CWE-824
- https://bugzilla.mozilla.org/show_bug.cgi?id=2014549 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