REDHAT-BUG-2503430: High severity Mozilla Firefox vulnerability
Published Jul 21, 2026
·Updated
JIT miscompilation in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 153 and Firefox ESR 140.13.
Affected Software
1 affected component
Mozilla Firefox<153, <140.13
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Firefoxto a version that resolves this vulnerability.Fixed in 153 - Upgrade
Upgrade
Firefox ESRto a version that resolves this vulnerability.Fixed in 140.13
Event History
Jul 21, 2026
Data Sourced
via Red Hat·01:02 PM
DescriptionSeverityAffected Software
Frequently Asked Questions
1
What is the severity of REDHAT-BUG-2503430?
The severity of REDHAT-BUG-2503430 is classified as high (7).
2
How do I fix REDHAT-BUG-2503430?
To fix REDHAT-BUG-2503430, ensure you update to Firefox 153 or Firefox ESR 140.13.
3
What is the risk associated with REDHAT-BUG-2503430?
The risk associated with REDHAT-BUG-2503430 is rated at 33.
4
What component is affected by REDHAT-BUG-2503430?
The component affected by REDHAT-BUG-2503430 is the JavaScript: WebAssembly in Mozilla Firefox.
5
When was REDHAT-BUG-2503430 published?
REDHAT-BUG-2503430 was published on July 21, 2026.