CVE-2026-4729
CRITICALMemory safety bugs fixed in Firefox 149 and Thunderbird 149
Title source: cnaDescription
Memory safety bugs present in Firefox 148 and Thunderbird 148. 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 and Thunderbird 149.
Scores
CVSS v3
9.8
EPSS
0.0002
EPSS Percentile
6.0%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
yes
Technical Impact
total
Details
CWE
CWE-120
Status
published
Products (6)
mozilla/firefox
< 149.0
Mozilla/Firefox
149
Mozilla/Firefox
unspecified - 149
mozilla/thunderbird
< 149.0
Mozilla/Thunderbird
149
Mozilla/Thunderbird
unspecified - 149
Published
Mar 24, 2026
Tracked Since
Mar 24, 2026