HarborGuard / CVE
Back to search
HIGHCVE-2026-5734Published Modified CNA mozilla

CVE-2026-5734: Memory safety bugs fixed in 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 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 140.9.1, Thunderbird 149.0.2, and Thunderbird 140.9.1.

Metrics

CVSS v3.1
8.1
Severity
HIGH
Fixed in
140.9.1
Affected Products
2

Fix available

140.9.1149.0.2
Affected packages
  • Mozilla / Firefox
    Fixed in 140.9.1, 149.0.2
  • Mozilla / Thunderbird
    Fixed in 140.9.1, 149.0.2
CVSS Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
References