UBUNTU-CVE-2026-124951: Medium severity ubuntu/mozjs52 vulnerability

Published Nov 12, 2026

Updated

Privilege escalation in the Nimbus Desktop Client component. This vulnerability was fixed in Firefox 160, Firefox ESR 153.7, Thunderbird 160, and Thunderbird 153.7.

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 Firefox to a version that resolves this vulnerability.
Fixed in 160
Upgrade
Upgrade Firefox ESR to a version that resolves this vulnerability.
Fixed in 153.7
Upgrade
Upgrade Thunderbird to a version that resolves this vulnerability.
Fixed in 160
Upgrade
Upgrade Thunderbird to a version that resolves this vulnerability.
Fixed in 153.7

Event History

Nov 12, 2026

CVE Published

via OSV·12:00 AM

Data Sourced

via OSV·12:00 AM

DescriptionSeverityAffected Software

Frequently Asked Questions

Which Ubuntu packages should be reviewed for exposure?

The listed Ubuntu packages are mozjs38, mozjs52, mozjs68, mozjs78, mozjs91, mozjs102, mozjs115, and thunderbird. The provided data does not identify affected package versions or Ubuntu releases.

Which upstream releases contain fixes?

The vulnerability was fixed in Firefox 160, Firefox ESR 153.7, Thunderbird 160, and Thunderbird 153.7.

What type of impact does successful exploitation have?

The issue is described as a privilege-escalation vulnerability in the Nimbus Desktop Client component. The provided information does not specify the attacker prerequisites, required access level, or exploitation method.