CVE-2026-4723 Details
Description
Use-after-free in the JavaScript Engine component. This vulnerability was fixed in Firefox 149 and Thunderbird 149.
A use-after-free vulnerability has been identified in the JavaScript engine of Mozilla Firefox. This issue affects Firefox versions prior to 149. The vulnerability arises from improper memory management, which can potentially be exploited to manipulate memory in a way that leads to unintended behavior.
Users can upgrade to Firefox 149 to address this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Mar 25, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://bugzilla.mozilla.org/show_bug.cgi?id=2013573 | [email protected] | Permissions Required |
| https://www.mozilla.org/security/advisories/mfsa2026-20/ | [email protected] | Vendor Advisory |
| https://www.mozilla.org/security/advisories/mfsa2026-23/ | [email protected] |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-416 | Use After Free | [email protected] |
| CWE-416 | Use After Free | CISA-ADP |
Affected Products
| Product | Versions |
|---|---|
| mozilla firefox | < 149.0 |
CPE
Remediation
| |
Change History
7 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Apr 13, 2026 | CVE Modified | [email protected] |
| Mar 25, 2026 | CVE Modified | CISA-ADP |
| Mar 24, 2026 | CVE Modified | [email protected] |
| Mar 24, 2026 | Initial Analysis | [email protected] |
| Mar 24, 2026 | New CVE Received | [email protected] |