CVE-2026-2767

CRITICAL

Firefox < 148.0 and Firefox ESR < 140.8.0 - Use-After-Free in JavaScript WebAssembly Component

Title source: llm
STIX 2.1

Description

Use-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 148, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.

References (5)

Core 5

Scores

CVSS v3 9.8
EPSS 0.0006
EPSS Percentile 17.6%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact total

Details

CWE
CWE-416
Status published
Products (8)
mozilla/firefox < 140.8.0
mozilla/firefox < 148.0
Mozilla/Firefox 140.8 - 140.*
Mozilla/Firefox 148
mozilla/thunderbird < 140.8.0
mozilla/thunderbird < 148.0
Mozilla/Thunderbird 140.8 - 140.*
Mozilla/Thunderbird 148
Published Feb 24, 2026
Tracked Since Feb 24, 2026