CVE-2026-4689

CRITICAL

Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component

Title source: cna
STIX 2.1

Description

Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.

References (6)

Scores

CVSS v3 10.0
EPSS 0.0003
EPSS Percentile 8.3%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact total

Details

CWE
CWE-120 CWE-190 CWE-754
Status published
Products (14)
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 < 140.9.0
mozilla/thunderbird < 149.0
... and 4 more
Published Mar 24, 2026
Tracked Since Mar 24, 2026