CVE-2026-12300

Memory safety bug fixed in Thunderbird 152

State: Published
Severity: 5.3 Medium
Published: Jun 16, 2026
Updated: Oct 21, 2026
Reserved: Jun 15, 2026

Description

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

Scores

CVSS	Score	Vector	Source
3.1	5.3 Medium	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N	CISA-ADP

Weaknesses

CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

Affected Products

Product	Versions
FirefoxMozilla	152 and laterNot affected
ThunderbirdMozilla	152 and laterNot affected

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1704114
https://www.mozilla.org/security/advisories/mfsa2026-57/
https://www.mozilla.org/security/advisories/mfsa2026-60/

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