CVE-2026-12326
HIGHMemory safety bugs fixed in Firefox 152 and Thunderbird 152
Title source: cnaDescription
Memory safety bugs present in Firefox 151 and Thunderbird 151. 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 152 and Thunderbird 152.
References (8)
Core 8
Core References
Moderate Severity memory safety bugs fixed in Firefox 152 and Thunderbird 152
https://bugzilla.mozilla.org/buglist.cgi?bug_id=1767455%2C2004308%2C2024445%2C2028182%2C2029765%2C2029883%2C2030110%2C2030149%2C2030366%2C2030374%2C2030564%2C2031120%2C2033411%2C2038695%2C2042465%2C2042781%2C2042907
Low Severity memory safety bugs fixed in Firefox 152 and Thunderbird 152
https://bugzilla.mozilla.org/buglist.cgi?bug_id=2021955%2C2025960%2C2029066%2C2029403%2C2029435%2C2029803%2C2030570%2C2030573%2C2032264%2C2033234%2C2034816%2C2035907%2C2035963%2C2036895%2C2036898%2C2036907%2C2036909%2C2036928%2C2036931%2C2036932%2C2036934%2C2039238%2C2039463
High Severity memory safety bugs fixed in Firefox 152 and Thunderbird 152
https://bugzilla.mozilla.org/buglist.cgi?bug_id=2039050%2C2042718%2C2042760%2C2044831%2C2045307%2C2045398%2C2045516%2C2045572%2C2041741%2C2044433
Vendor Advisory
https://access.redhat.com/security/cve/CVE-2026-12326
Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2489222
Scores
CVSS v3
8.1
EPSS
0.0025
EPSS Percentile
16.3%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
total
Details
CWE
CWE-119
CWE-825
Status
published
Products (4)
mozilla/firefox
< 152.0.0
Mozilla/Firefox
152
mozilla/thunderbird
< 152.0.0
Mozilla/Thunderbird
152
Published
Jun 16, 2026
Tracked Since
Jun 16, 2026