CVE-2026-12329

Memory safety bug fixed in Thunderbird ESR 140.12. This vulnerability was fixed in Firefox ESR 140.12 and Thunderbird 140.12.

CVSS v3 5.3 MEDIUM

5.3^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 3.9 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact LOW

Scope UNCHANGED

References

Link	Resource
https://bugzilla.mozilla.org/show_bug.cgi?id=2044738	Permissions Required
https://www.mozilla.org/security/advisories/mfsa2026-58/	Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-61/	Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:27717
https://access.redhat.com/errata/RHSA-2026:27733
https://access.redhat.com/errata/RHSA-2026:27734
https://access.redhat.com/errata/RHSA-2026:29940
https://access.redhat.com/errata/RHSA-2026:30846
https://access.redhat.com/errata/RHSA-2026:33445
https://access.redhat.com/errata/RHSA-2026:36100
https://access.redhat.com/errata/RHSA-2026:36101
https://access.redhat.com/errata/RHSA-2026:36102
https://access.redhat.com/errata/RHSA-2026:36103
https://access.redhat.com/errata/RHSA-2026:37210
https://access.redhat.com/errata/RHSA-2026:37391
https://access.redhat.com/errata/RHSA-2026:38506
https://access.redhat.com/errata/RHSA-2026:38750
https://access.redhat.com/errata/RHSA-2026:38751
https://access.redhat.com/errata/RHSA-2026:38753
https://access.redhat.com/errata/RHSA-2026:39011
https://access.redhat.com/errata/RHSA-2026:39141
https://access.redhat.com/errata/RHSA-2026:39142
https://access.redhat.com/errata/RHSA-2026:39428
https://access.redhat.com/errata/RHSA-2026:39706
https://access.redhat.com/security/cve/CVE-2026-12329
https://bugzilla.redhat.com/show_bug.cgi?id=2489214
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-12329.json

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:mozilla:firefox:::::esr:::*
	cpe:2.3:a:mozilla:thunderbird:::::esr:::*

History

No history.

Information

Published : 2026-06-16 13:16

Updated : 2026-07-15 12:17

NVD link : CVE-2026-12329

Mitre link : CVE-2026-12329

CVE.ORG link : CVE-2026-12329

JSON object : View

Products Affected

mozilla

thunderbird
firefox

CWE

CWE-119

Improper Restriction of Operations within the Bounds of a Memory Buffer

CWE-416

Use After Free

CWE-476

NULL Pointer Dereference

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