CVE-2026-4729
critical · 9.8Memory 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.
9.8
CVSS
0.3%
EPSS (exploit prob.)
26th
EPSS percentile
2026-03-24
Published
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weaknesses
CWE-120CWE-825
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| mozilla | firefox | < 149.0 |
| mozilla | thunderbird | < 149.0 |
Check a specific version with /api/v1/cve/match.
References
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=1944033%2C1997282%2C2009213%2C2011412%2C2021925%2C2022034
- https://www.mozilla.org/security/advisories/mfsa2026-20/
- https://www.mozilla.org/security/advisories/mfsa2026-23/
- https://access.redhat.com/security/cve/CVE-2026-4729
- https://bugzilla.redhat.com/show_bug.cgi?id=2450745
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4729.json
Query this programmatically:
curl https://evil-db.io/api/v1/cve/CVE-2026-4729