Critical severity9.8NVD Advisory· Published Mar 24, 2026· Updated Jul 15, 2026
CVE-2026-4729
CVE-2026-4729
Description
Memory safety bugs present in Firefox 148 and Thunderbird 148. 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 149 and Thunderbird 149.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
9cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*+ 1 more
- cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*range: <149.0
- (no CPE)range: <149, >=148
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*+ 1 more
- cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*range: <149.0
- (no CPE)range: <149, >=148
- osv-coords5 versionspkg:apk/chainguard/firefoxpkg:apk/chainguard/firefox-esrpkg:apk/wolfi/firefoxpkg:rpm/opensuse/MozillaFirefox&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/firefox-esr&distro=openSUSE%20Tumbleweed
< 149.0-r0+ 4 more
- (no CPE)range: < 149.0-r0
- (no CPE)range: < 0
- (no CPE)range: < 149.0-r0
- (no CPE)range: < 149.0-1.1
- (no CPE)range: < 153.0-1.1
Patches
Vulnerability mechanics
References
6- www.mozilla.org/security/advisories/mfsa2026-20/nvdVendor Advisory
- www.mozilla.org/security/advisories/mfsa2026-23/nvdVendor Advisory
- bugzilla.mozilla.org/buglist.cginvdBroken Link
- access.redhat.com/security/cve/CVE-2026-4729nvd
- bugzilla.redhat.com/show_bug.cginvd
- security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4729.jsonnvd
News mentions
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