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CVE-2026-2792

CRITICAL
9.8
CVSS 3.1
Description
Memory safety bugs present in Firefox ESR 140.7, Thunderbird ESR 140.7, Firefox 147 and Thunderbird 147. 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 148, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.

Metadata

CVE ID
CVE-2026-2792
State
PUBLISHED
Assigner
mozilla
Reserved
2026-02-19 15:06 UTC
Published
2026-02-24 13:33 UTC
Last updated
2026-07-15 01:12 UTC
Primary CWE
CWE-787
CWE-787 Out-of-bounds Write
Vendor / Product
Mozilla / Firefox
Sources
cve.org  ·  NVD

Severity & Metrics

9.8 CRITICAL CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC — CISA Coordinator
Exploitation
none
Automatable
no
Tech. Impact
total
Affected products (2)
VendorProductPlatformVersions
Mozilla Firefox — 140.8 ≤ 140.*, 148 ≤ *
Mozilla Thunderbird — 140.8 ≤ 140.*, 148 ≤ *
Weakness (CWE)
CWESourceDescription
CWE-787 adp CWE-787 Out-of-bounds Write
CVSS scores (2)
ScoreSeverityVersionSourceVector
9.8 CRITICAL 3.1 adp CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5 HIGH 3.1 adp CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
References (5)
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