Invalid pointer in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact Low

Integrity Impact Low

Availability Impact Low

User Interaction Required

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploitation none

Automatable no

Technical Impact partial

Affected Vendors & Products

Vendors Products
Mozilla
  • Firefox
  • Thunderbird

Configuration 1 [-]

OR cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*
cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:*

No data.

References
Link Providers
https://bugzilla.mozilla.org/show_bug.cgi?id=2013588 cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-6757 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-6757 cve-icon
https://www.mozilla.org/security/advisories/mfsa2026-30/ cve-icon cve-icon
https://www.mozilla.org/security/advisories/mfsa2026-30/#CVE-2026-6757 cve-icon
https://www.mozilla.org/security/advisories/mfsa2026-32/ cve-icon cve-icon
https://www.mozilla.org/security/advisories/mfsa2026-32/#CVE-2026-6757 cve-icon
https://www.mozilla.org/security/advisories/mfsa2026-33/ cve-icon cve-icon
https://www.mozilla.org/security/advisories/mfsa2026-34/ cve-icon cve-icon
History

Wed, 22 Apr 2026 17:45:00 +0000

Type Values Removed Values Added
First Time appeared Mozilla thunderbird
CPEs cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*
cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:*
Vendors & Products Mozilla thunderbird

Wed, 22 Apr 2026 16:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-824
Metrics cvssV3_1

{'score': 6.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N'}

 ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

cvssV3_1

{'score': 6.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L'}

Wed, 22 Apr 2026 12:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-823
References
Metrics threat_severity

None

 cvssV3_1

{'score': 6.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N'}

threat_severity

Moderate

Wed, 22 Apr 2026 10:00:00 +0000

Type Values Removed Values Added
Weaknesses CWE-119
CWE-416

Wed, 22 Apr 2026 08:00:00 +0000

Type Values Removed Values Added
Weaknesses CWE-119
CWE-416

Wed, 22 Apr 2026 03:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-119
CWE-416

Wed, 22 Apr 2026 00:00:00 +0000

Type Values Removed Values Added
Description Invalid pointer in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 150 and Firefox ESR 140.10. Invalid pointer in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
References

Tue, 21 Apr 2026 17:30:00 +0000

Type Values Removed Values Added
First Time appeared Mozilla
Mozilla firefox
Vendors & Products Mozilla
Mozilla firefox

Tue, 21 Apr 2026 13:15:00 +0000

Type Values Removed Values Added
Description Invalid pointer in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 150 and Firefox ESR 140.10.
Title Invalid pointer in the JavaScript: WebAssembly component
References
cve-icon MITRE

Status: PUBLISHED

Assigner: mozilla

Published: 2026-04-21T12:40:52.961Z

Updated: 2026-04-22T15:35:04.751Z

Reserved: 2026-04-21T12:40:52.634Z

Link: CVE-2026-6757

cve-icon Vulnrichment

Updated: 2026-04-22T14:31:11.703Z

cve-icon NVD

Status : Analyzed

Published: 2026-04-21T13:16:21.690

Modified: 2026-04-22T17:39:26.500

Link: CVE-2026-6757

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-04-21T12:40:52Z

Links: CVE-2026-6757 - Bugzilla