CVE-2026-6757 Details
Description
Invalid pointer in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
A vulnerability has been identified in the JavaScript WebAssembly component of Mozilla Firefox. This issue involves an invalid pointer, which can potentially lead to memory corruption. The vulnerability affects Firefox versions prior to 150 and Firefox ESR versions prior to 140.10. It was reported by a group of researchers using Claude from Anthropic.
Users can upgrade to Firefox 150 or Firefox ESR 140.10 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 Apr 22, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://bugzilla.mozilla.org/show_bug.cgi?id=2013588 | [email protected] | Permissions Required |
| https://www.mozilla.org/security/advisories/mfsa2026-30/ | [email protected] | Vendor Advisory |
| https://www.mozilla.org/security/advisories/mfsa2026-32/ | [email protected] | Vendor Advisory |
| https://www.mozilla.org/security/advisories/mfsa2026-33/ | [email protected] | Vendor Advisory |
| https://www.mozilla.org/security/advisories/mfsa2026-34/ | [email protected] | Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-824 | Access of Uninitialized Pointer | CISA-ADP |
Affected Products
| Product | Versions |
|---|---|
| mozilla firefox | < 140.10.0 < 150.0 |
CPE
Remediation
| |
| mozilla thunderbird | >= 140.0, < 140.10.0 |
CPE
Remediation
| |
Change History
6 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Apr 22, 2026 | Initial Analysis | [email protected] |
| Apr 22, 2026 | CVE Modified | CISA-ADP |
| Apr 22, 2026 | CVE Modified | [email protected] |
| Apr 21, 2026 | New CVE Received | [email protected] |