MEDIUM
CVE-2026-12329
CVSS
5.3
Description
Memory safety bug fixed in Thunderbird ESR 140.12. This vulnerability was fixed in Firefox ESR 140.12 and Thunderbird 140.12.
Weakness (CWE)
CWE-119
Memory Buffer Bounds Error
CWE-416
Use After Free
CWE-476
NULL Pointer Dereference
EPSS Score
0.31%
Probability of exploitation in next 30 days
24.5th percentile
References
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
Base CVE data derived from NVD (public domain). Enrichment by
dbcve.org
(CC-BY-4.0). Fetched via API.