High severity7.5NVD Advisory· Published Apr 21, 2026· Updated May 7, 2026

CVE-2026-6784

Description

Memory safety bugs present in Firefox 149 and Thunderbird 149. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 150 and Thunderbird 150.

AI Insight

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

Affected products

Mozilla Corporation/Firefox
cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*
Range: <150.0
Mozilla Corporation/Thunderbird
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*
Range: <150.0
osv-coords
pkg:rpm/opensuse/MozillaFirefox&distro=openSUSE%20Tumbleweed
Range: < 150.0-1.1

Patches

Vulnerability mechanics

References

www.mozilla.org/security/advisories/mfsa2026-30/nvdVendor Advisory
www.mozilla.org/security/advisories/mfsa2026-33/nvdVendor Advisory
bugzilla.mozilla.org/buglist.cginvd

News mentions

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cvss	0.488
epss	0.000
exploit	0.000
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ransomware	0.000