UBUNTU-CVE-2026-124878: Use After Free
Published Nov 12, 2026
·Updated
Use-after-free in the Layout: Positioned 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 upstream releases include the fix?
The vulnerability was fixed in Firefox 160 and Thunderbird 160.
2
Which Ubuntu package families should be reviewed for exposure?
Review ubuntu/thunderbird and the listed Mozilla JavaScript engine packages: ubuntu/mozjs38, ubuntu/mozjs52, ubuntu/mozjs68, ubuntu/mozjs78, ubuntu/mozjs91, ubuntu/mozjs102, and ubuntu/mozjs115.