VDB
CVE-2026-84120
CVE-2026-84120
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 115.40, 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 | 115.40, 140.15, 153.2 |
| Mozilla | Thunderbird | 140.15, 153.2, 155 |
| chainguard | firefox | 0, 0 |
| Mozilla | Thunderbird | 140.15, 155, 153.2 |
| Mozilla | Firefox | 155, 115.40, 140.15 |
| wolfi | firefox | 0, 0, 0 |
Timeline
- Sep 1, 2026 Coalition ESS Score
- Sep 1, 2026 CVE Published
- Sep 1, 2026 CVE Updated
- Sep 2, 2026 EPSS Score
- Sep 3, 2026 EPSS Score
- Sep 12, 2026 EPSS Score
- Sep 17, 2026 EPSS Score
- Sep 18, 2026 EPSS Score