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Medium severity4.3NVD Advisory· Published Sep 1, 2026· Updated Sep 3, 2026

CVE-2026-84126

CVE-2026-84126

Description

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

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

5

osv-coords3 versions
pkg:apk/chainguard/firefox-docker-selenium-compat pkg:rpm/opensuse/MozillaFirefox&distro=openSUSE%20Tumbleweed pkg:apk/wolfi/firefox-docker-selenium-compat
< 155.0.1-r0+ 2 more
- (no CPE)range: < 155.0.1-r0
- (no CPE)range: < 155.0-1.1
- (no CPE)range: < 155.0.1-r0
Mozilla Corporation/Firefoxllm-fuzzy
Range: >=155
Mozilla Corporation/Thunderbirdllm-fuzzy
Range: >=155

Patches

Vulnerability mechanics

References

3

www.mozilla.org/security/advisories/mfsa2026-82/nvdVendor Advisory
www.mozilla.org/security/advisories/mfsa2026-86/nvdVendor Advisory
bugzilla.mozilla.org/show_bug.cginvdPermissions Required

News mentions

2

⚡ Weekly Recap: Chrome 0-Day, Router Hijacks, Coder Supply Chain Attack and More
The Hacker News · Sep 7, 2026
Mozilla Firefox & Thunderbird: 25 Vulnerabilities Including Critical Sandbox Escapes Disclosed Together
Vypr Intelligence · Sep 1, 2026