HarborGuard / CVE
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CRITICALCVE-2026-4729Published Modified CNA mozilla

CVE-2026-4729: Memory safety bugs fixed in Firefox 149 and Thunderbird 149

Memory safety bugs present in Firefox 148 and Thunderbird 148. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 149 and Thunderbird 149.

Metrics

CVSS v3.1
9.8
Severity
CRITICAL
Fixed in
149
Affected Products
2

Fix available

149
Affected packages
  • Mozilla / Firefox
    Fixed in 149
  • Mozilla / Thunderbird
    Fixed in 149
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
References