UBUNTU-CVE-2026-124900: Use After Free
Published Nov 12, 2026
·Updated
Sandbox escape due to use-after-free in the DOM: Service Workers component. This vulnerability was fixed in Firefox 160 and Thunderbird 160.
Affected Software
10 affected components
ubuntu/mozjs52*
ubuntu/mozjs38*
ubuntu/mozjs68*
ubuntu/mozjs52*
ubuntu/mozjs102*
ubuntu/mozjs78*
ubuntu/mozjs91*
ubuntu/thunderbird*
ubuntu/mozjs102*
ubuntu/mozjs115*
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Firefoxto a version that resolves this vulnerability.Fixed in 160 - Upgrade
Upgrade
Thunderbirdto a version that resolves this vulnerability.Fixed in 160
Event History
Nov 12, 2026
CVE Published
via OSV·12:00 AM
Data Sourced
via OSV·12:00 AM
DescriptionSeverityAffected Software
Frequently Asked Questions
1
Which Ubuntu packages should be reviewed for exposure?
The affected software list includes ubuntu/thunderbird and the Ubuntu mozjs38, mozjs52, mozjs68, mozjs78, mozjs91, mozjs102, and mozjs115 packages.
2
What component is involved in this issue?
The vulnerability is a use-after-free in the DOM Service Workers component, which can result in a sandbox escape.
3
What fixed upstream releases are identified?
The issue was fixed in Firefox 160 and Thunderbird 160.