VDB
CVE-2026-84122
CVE-2026-84122
PUBLISHED
CVSS 5.4 MEDIUM
Reported by mozilla · Published September 1, 2026
Use-after-free in the Audio/Video component. This vulnerability was fixed in Firefox 155, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.
Risk Scores
CVSS 3.1
5.4
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | 140.15, 153.2, 155 |
| Mozilla | Thunderbird | 140.15, 153.2, 155 |
| chainguard | firefox | 0, 0 |
| Mozilla | Thunderbird | 140.15, 155, 153.2 |
| Mozilla | Firefox | 155, 140.15, 153.2 |
| wolfi | firefox | 0, 0, 0 |
Timeline
- Sep 1, 2026 Coalition ESS Score
- Sep 1, 2026 CVE Published
- Sep 2, 2026 EPSS Score
- Sep 2, 2026 CVE Updated
- Sep 3, 2026 EPSS Score
- Sep 12, 2026 EPSS Score
- Sep 17, 2026 EPSS Score
- Sep 18, 2026 EPSS Score