Mozilla Firefox CVE-2026-6754

| EUVD-2026-24095 HIGH
Use After Free (CWE-416)
2026-04-21 mozilla GHSA-99hh-xp2q-f3fc
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 - 00:39 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 Engine component. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, and Firefox ESR 140.10.

AnalysisAI

Remote attackers can crash Mozilla Firefox by triggering a use-after-free in the JavaScript Engine, exploiting freed memory during JS execution to cause denial of service. Affects all unpatched Firefox versions below 150, ESR 115.35, and ESR 140.10. …

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RemediationAI

Within 24 hours: Inventory all Firefox deployments across the organization and identify business-critical systems dependent on Firefox for operations. Within 7 days: Communicate to end-users the urgency of updating Firefox to version 150 or later (ESR users to 115.35 or 140.10 or later); consider mandatory updates via endpoint management if available. …

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CVE-2026-6754 vulnerability details – vuln.today
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