CVE-2026-5735
critical · 9.8Memory safety bugs present in Firefox 149.0.1 and Thunderbird 149.0.1. 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 149.0.2 and Thunderbird 149.0.2.
9.8
CVSS
0.3%
EPSS (exploit prob.)
18th
EPSS percentile
2026-04-07
Published
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weaknesses
CWE-787CWE-125
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| mozilla | firefox | < 149.0.2 |
| mozilla | thunderbird | < 149.0.2 |
Check a specific version with /api/v1/cve/match.
References
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2025475%2C2025477
- https://www.mozilla.org/security/advisories/mfsa2026-25/
- https://www.mozilla.org/security/advisories/mfsa2026-28/
- https://access.redhat.com/security/cve/CVE-2026-5735
- https://bugzilla.redhat.com/show_bug.cgi?id=2455904
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-5735.json
Query this programmatically:
curl https://evil-db.io/api/v1/cve/CVE-2026-5735