Firefox CVE-2026-6758

| EUVD-2026-24099 HIGH
Use After Free (CWE-416)
2026-04-21 mozilla GHSA-28xp-3gpw-3vvp
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 - 00:38 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 JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 150.

AnalysisAI

Use-after-free in Firefox's WebAssembly JavaScript engine enables remote denial-of-service attacks against users running unpatched versions below Firefox 150. The vulnerability allows network-based attackers to crash the browser without authentication or user interaction by triggering memory corruption in WebAssembly processing. …

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RemediationAI

Within 24 hours: Inventory Firefox deployments and versions across the organization. Within 7 days: Deploy Firefox 150 or later to all endpoints; verify completion via endpoint management tools. …

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CVE-2026-6758 vulnerability details – vuln.today
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