CVE-2026-4684 Details
Description
Race condition, use-after-free in the Graphics: WebRender component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.
A race condition vulnerability leading to a use-after-free error has been identified in the WebRender component of Mozilla Firefox. This issue affects Firefox versions prior to 149, as well as Firefox ESR versions prior to 115.34 and prior to 140.9.
Users can upgrade to Firefox 149 or Firefox ESR 115.34 or 140.9 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 24, 2026References to Advisories, Solutions, and Tools
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Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-362 | Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') | CISA-ADP |
| CWE-364 | Signal Handler Race Condition | redhat-SADP |
| CWE-416 | Use After Free | CISA-ADP |
Affected Products
| Product | Versions |
|---|---|
| mozilla firefox | < 115.34.0 < 149.0 >= 128.0, < 140.9.0 |
CPE
Remediation
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Change History
9 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 15, 2026 | CVE Modified | redhat-SADP |
| Jun 30, 2026 | CVE Modified | redhat-SADP |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Apr 13, 2026 | CVE Modified | [email protected] |
| Mar 24, 2026 | CVE Modified | [email protected] |
| Mar 24, 2026 | Initial Analysis | [email protected] |
| Mar 24, 2026 | CVE Modified | CISA-ADP |
| Mar 24, 2026 | New CVE Received | [email protected] |