CVE-2026-12321

MEDIUM

JIT miscompilation in the JavaScript: WebAssembly component

Title source: cna
STIX 2.1

Description

JIT miscompilation in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 152 and Thunderbird 152.

References (3)

Core 3

Scores

CVSS v3 5.4
EPSS 0.0016
EPSS Percentile 5.5%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-670
Status published
Products (4)
mozilla/firefox < 152.0.0
Mozilla/Firefox 152
mozilla/thunderbird < 152.0.0
Mozilla/Thunderbird 152
Published Jun 16, 2026
Tracked Since Jun 16, 2026