HarborGuard / CVE
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CRITICALCVE-2026-5731Published Modified CNA mozilla

CVE-2026-5731: Memory safety bugs fixed in Firefox ESR 115.34.1, Firefox ESR 140.9.1, Thunderbird ESR 140.9.1, Firefox 149.0.2 and Thunderbird 149.0.2

Memory safety bugs present in Firefox ESR 115.34.0, Firefox ESR 140.9.0, Thunderbird ESR 140.9.0, Firefox 149.0.1 and Thunderbird 149.0.1. 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 149.0.2, Firefox ESR 115.34.1, Firefox ESR 140.9.1, Thunderbird 149.0.2, and Thunderbird 140.9.1.

Metrics

CVSS v3.1
9.8
Severity
CRITICAL
Fixed in
115.34.1
Affected Products
2

Fix available

115.34.1140.9.1149.0.2
Affected packages
  • Mozilla / Firefox
    Fixed in 115.34.1, 140.9.1, 149.0.2
  • Mozilla / Thunderbird
    Fixed in 140.9.1, 149.0.2
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
References