CVE-2026-5735
8.1
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
Memory 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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Mozilla | Firefox | 149.0.2 <= * | unaffected |
| Mozilla | Thunderbird | 149.0.2 <= * | unaffected |
Weaknesses
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: no
- Technical Impact: total
thunderbird: firefox: Memory safety bugs fixed in Firefox 149.0.2 and Thunderbird 149.0.2
Additional References
- 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
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/
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