CVE-2026-12299

Severity CVSS v4.0:

Pending analysis

Type:

Unavailable / Other

Publication date:

16/06/2026

Last modified:

16/06/2026

Description

JIT miscompilation in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12.

Impact

Vector 3.x

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N CVSS v3.1 Severity and Metrics:

Base Score: 5.40 MEDIUM
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): Required
Scope (S): Unchanged
Confidentiality (C): Low
Integrity (I): Low
Availability (A): None

Base Score 3.x

5.40

Severity 3.x

MEDIUM

Vulnerable products and versions

CPE	From	Up to
cpe:2.3:a:mozilla:firefox:::::esr:::*		115.37.0 (excluding)
cpe:2.3:a:mozilla:firefox:::::-:::*		152.0 (excluding)
cpe:2.3:a:mozilla:firefox:::::esr:::*	140.0 (including)	140.12.0 (excluding)
cpe:2.3:a:mozilla:thunderbird:::::-:::*		152.0.0 (excluding)
cpe:2.3:a:mozilla:thunderbird:::::esr:::*	140.0 (including)	140.12.0 (excluding)

To consult the complete list of CPE names with products and versions, see this page

CVE-2026-12299

Description

Impact

Vulnerable products and versions

References to Advisories, Solutions, and Tools