Mozilla Firefox EUVD-2026-24100

| CVE-2026-6759 HIGH
Use After Free (CWE-416)
2026-04-21 mozilla GHSA-w4vh-g4vq-3rf9
Information Disclosure Use After Free Memory Corruption Mozilla
7.5
CVSS 3.1
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CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

4
Analysis Updated
Apr 22, 2026 - 00:37 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Apr 22, 2026 - 00:22 vuln.today
cvss_changed
Analysis Generated
Apr 21, 2026 - 18:23 vuln.today
CVSS changed
Apr 21, 2026 - 18:22 NVD
7.5 (HIGH)

DescriptionNVD

Use-after-free in the Widget: Cocoa component. This vulnerability was fixed in Firefox 150 and Firefox ESR 140.10.

AnalysisAI

Memory corruption in Firefox's Widget: Cocoa component on macOS enables remote denial of service through use-after-free exploitation. Mozilla patched this in Firefox 150 and Firefox ESR 140.10 after internal discovery. …

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RemediationAI

Within 24 hours: Identify all macOS endpoints running Firefox versions prior to 150 (standard) or 140.10 (ESR) using endpoint detection tools or MDM; communicate mandatory upgrade requirement to affected users. Within 7 days: Deploy Firefox 150 or Firefox ESR 140.10 via your software distribution mechanism (Jamf, Microsoft Intune, or equivalent) with enforcement if possible; verify deployment completion across all macOS assets. …

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EUVD-2026-24100 vulnerability details – vuln.today
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