CVE-2026-84126

Incorrect boundary conditions in the Layout: Grid component

State: Published
Severity: 4.3 Medium
Published: Sep 1, 2026
Updated: Sep 1, 2026
Reserved: Sep 1, 2026

Description

Incorrect boundary conditions in the Layout: Grid component. This vulnerability was fixed in Firefox 155 and Thunderbird 155.

Scores

CVSS	Score	Vector	Source
3.1	4.3 Medium	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N	CISA-ADP

Weaknesses

CWE-120 Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

Affected Products

Product	Versions
FirefoxMozilla	155 and laterNot affected
ThunderbirdMozilla	155 and laterNot affected

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2063893
https://www.mozilla.org/security/advisories/mfsa2026-82/
https://www.mozilla.org/security/advisories/mfsa2026-86/

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