CVE-2026-12309

MediumCVSS 6.5/10Last modified Oct 26, 2026

Description

Memory safety bug fixed in Thunderbird 152. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12.

Metrics

CVSS 3.1 6.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L

Weakness enumeration

CWE-119

Affected software

VendorProductVersions
MozillaFirefox—
MozillaThunderbird—

References

Timeline

Published
Jun 16, 2026
Last modified
Oct 26, 2026
NVD status
Modified

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CVE-2026-12309: Medium severity, CVSS 6.5 | Vulnix