9.8
Critical
CVE-2026-117946 Incorrect boundary conditions in the JavaScript Engine component
Description
Incorrect boundary conditions in the JavaScript Engine component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.
CVSS 3.1 detail
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HExploitable remotely over the network, without an account and without any user action; an attacker can seriously compromise confidentiality, integrity or availability.
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- Interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Firefox 159 | earliest → < 159 | 159 |
| Firefox 153.6 | earliest → < 153.6 | 153.6 |
| Firefox 115.44 | earliest → < 115.44 | 115.44 |
| Thunderbird 159 | earliest → < 159 | 159 |
| Thunderbird 153.6 | earliest → < 153.6 | 153.6 |