CVE-2026-4698

CRITICAL

JIT miscompilation in the JavaScript Engine: JIT component

Title source: cna
STIX 2.1

Description

JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.

References (34)

Core 34
Core References

Scores

CVSS v3 9.8
EPSS 0.0076
EPSS Percentile 51.5%
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-733 CWE-843
Status published
Products (12)
mozilla/firefox < 115.34.0
mozilla/firefox < 149.0
Mozilla/Firefox 115.34 - 115.*
Mozilla/Firefox 140.9 - 140.*
Mozilla/Firefox 149
Mozilla/Firefox unspecified - 149
Mozilla/Firefox ESR unspecified - 115.34
Mozilla/Firefox ESR unspecified - 140.9
Mozilla/Thunderbird 140.9 - 140.*
Mozilla/Thunderbird 149
... and 2 more
Published Mar 24, 2026
Tracked Since Mar 24, 2026