HarborGuard / CVE
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HIGHCVE-2026-6786Published Modified CNA mozilla

CVE-2026-6786: Memory safety bugs fixed in Firefox ESR 140.10, Thunderbird ESR 140.10, Firefox 150 and Thunderbird 150

Memory safety bugs present in Firefox ESR 140.9, Thunderbird ESR 140.9, Firefox 149 and Thunderbird 149. 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 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.

Metrics

CVSS v3.1
7.5
Severity
HIGH
Fixed in
140.10
Affected Products
2

Fix available

140.10150
Affected packages
  • Mozilla / Firefox
    Fixed in 140.10, 150
  • Mozilla / Thunderbird
    Fixed in 140.10, 150
CVSS Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
References