HarborGuard / CVE
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HIGHCVE-2026-8974Published Modified CNA mozilla

CVE-2026-8974: Memory safety bugs fixed in Firefox ESR 140.11 and Firefox 151

Memory safety bugs present in Firefox ESR 140.10 and Firefox 150. 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 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.

Metrics

CVSS v3.1
8.8
Severity
HIGH
Fixed in
140.11
Affected Products
2

Fix available

140.11151
Affected packages
  • Mozilla / Firefox
    Fixed in 140.11, 151
  • Mozilla / Thunderbird
    Fixed in 140.11, 151
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
References