Monitor vulnerabilities like this one.
Sign up free to get alerted when software you use is affected.
9.8
Firefox and Thunderbird Can Crash Due to JavaScript Memory Error
CVE-2026-2795
Summary
Using Firefox or Thunderbird versions less than 148 can lead to a crash if a malicious website exploits a memory error in the JavaScript engine. This can result in data loss or system instability. 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
Use-after-free in the JavaScript: GC component. This vulnerability affects Firefox < 148 and Thunderbird < 148.
Original description
Use-after-free in the JavaScript: GC component. This vulnerability affects Firefox < 148 and Thunderbird < 148.
nvd CVSS3.1
9.8
Vulnerability type
CWE-416
Use After Free
- https://bugzilla.mozilla.org/show_bug.cgi?id=2010940 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