CVE-2026-2796 | JIT miscompilation in the JavaScript: WebAssembly component.… | CVSS 9.8 CRITICAL

Description

JIT miscompilation in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 148 and Thunderbird 148.

CVE ID: CVE-2026-2796
State: PUBLISHED
Assigner: mozilla
Reserved: 2026-02-19 15:06 UTC
Published: 2026-02-24 13:33 UTC
Last updated: 2026-07-15 01:12 UTC
Primary CWE: CWE-843
CWE-843 Access of Resource Using Incompatible Type ('Type Co…
Vendor / Product: Mozilla / Firefox
Sources: cve.org · NVD

9.8 CRITICAL CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

SSVC — CISA Coordinator

Affected products (2)

Vendor	Product	Platform	Versions
Mozilla	Firefox	—	148 ≤ *
Mozilla	Thunderbird	—	148 ≤ *

Weakness (CWE)

CWE	Source	Description
CWE-843	adp	CWE-843 Access of Resource Using Incompatible Type ('Type Confusion')

CVSS scores (2)

Score	Severity	Version	Source	Vector
9.8	CRITICAL	3.1	adp	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5	HIGH	3.1	adp	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

References (3)