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Mozilla Firefox CVE-2026-6759

| EUVDEUVD-2026-24100 HIGH
Use After Free (CWE-416)
2026-04-21 mozilla GHSA-w4vh-g4vq-3rf9
Information Disclosure Memory Corruption Use After Free Mozilla Red Hat Suse
7.5
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SUSE
HIGH
qualitative
Red Hat
6.1 MEDIUM
qualitative

Primary rating from NVD.

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

8
Patch released
Apr 29, 2026 - 02:30 nvd
Patch available
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)
EUVD ID Assigned
Apr 21, 2026 - 13:15 euvd
EUVD-2026-24100
Analysis Generated
Apr 21, 2026 - 13:15 vuln.today
CVE Published
Apr 21, 2026 - 12:40 nvd
HIGH 7.5

DescriptionCVE.org

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. The CVSS vector indicates network-accessible exploitation requiring no authentication or user interaction, though SSVC assessment classifies technical impact as partial and exploitation as non-automatable. No public exploit identified at time of analysis, with SSVC indicating no evidence of active exploitation.

Technical ContextAI

This vulnerability affects the Widget: Cocoa component, which is Firefox's macOS-specific UI rendering layer that interfaces with Apple's Cocoa framework for native window management, menus, and platform integration. The use-after-free condition (CWE-416) occurs when the code attempts to access memory that has already been freed, typically when object lifetimes are mismanaged during UI operations or event handling. On macOS systems, the Cocoa widget implementation handles platform-specific rendering and event processing, making this vulnerability specific to Firefox installations on Apple operating systems. The CPE string confirms Mozilla Firefox as the affected product across all affected versions prior to the fixes.

RemediationAI

Upgrade to Firefox 150 or later for standard release channel users, or Firefox ESR 140.10 or later for extended support users. Download updates from Mozilla's official channels at mozilla.org or through the browser's built-in update mechanism (Help > About Firefox). Vendor patches are confirmed in Mozilla security advisories MFSA2026-30 (https://www.mozilla.org/security/advisories/mfsa2026-30/) and MFSA2026-32 (https://www.mozilla.org/security/advisories/mfsa2026-32/). If immediate patching is not possible, macOS-specific compensating controls include restricting Firefox network access through application firewall rules or forcing offline operation for critical systems, though this severely impacts browser functionality. Organizations may also temporarily migrate users to alternative browsers on macOS until Firefox updates can be deployed, accepting the operational disruption this entails. No workarounds exist that preserve full browser functionality while mitigating the vulnerability.

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Same weakness CWE-416 – Use After Free

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Same technique Information Disclosure

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Vendor StatusVendor

SUSE

Severity: High
Product Status
SUSE Liberty Linux 10 Fixed
SUSE Liberty Linux 8 Fixed
SUSE Liberty Linux 9 Fixed
SUSE Linux Enterprise Server 16.0 SUSE Linux Enterprise Server for SAP applications 16.0 Fixed
openSUSE Leap 16.0 Fixed

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CVE-2026-6759 vulnerability details – vuln.today
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