🔐 CVE Alert

CVE-2026-12329

MEDIUM 5.3

Memory safety bug fixed in Thunderbird ESR 140.12

CVSS Score
5.3
EPSS Score
0.0%
EPSS Percentile
0th

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

Vendor mozilla
Product firefox
Ecosystems
Industries
Technology
Published Jun 16, 2026
Last Updated Jun 16, 2026
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Affected Versions

Mozilla / Firefox
All versions affected
Mozilla / Thunderbird
All versions affected

References

NVD ↗ CVE.org ↗ EPSS Data ↗
bugzilla.mozilla.org: https://bugzilla.mozilla.org/show_bug.cgi?id=2044738 mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-58/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-61/

Credits

Michael Froman