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Mozilla CVE-2026-4723

| EUVDEUVD-2026-14861 CRITICAL
Use After Free (CWE-416)
2026-03-24 mozilla GHSA-c97j-hmj5-572h
Information Disclosure Memory Corruption Mozilla Use After Free Red Hat Suse
Critical
Disputed · 9.8 NVD
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Severity by source

Sources disagree (Medium–Critical)
NVD PRIMARY
9.8 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SUSE
CRITICAL
qualitative
Red Hat
6.1 MEDIUM
qualitative

vuln.today treats the vendor’s rating as authoritative. A higher third-party CVSS (e.g. CISA-ADP) is shown for transparency but does not drive the headline severity.

CVSS VectorNVD

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

Lifecycle Timeline

4
Patch released
Mar 31, 2026 - 21:13 nvd
Patch available
EUVD ID Assigned
Mar 24, 2026 - 12:45 euvd
EUVD-2026-14861
Analysis Generated
Mar 24, 2026 - 12:45 vuln.today
CVE Published
Mar 24, 2026 - 12:30 nvd
CRITICAL 9.8

DescriptionCVE.org

Use-after-free in the JavaScript Engine component. This vulnerability affects Firefox < 149.

AnalysisAI

Firefox versions prior to 149 contain a use-after-free vulnerability in the JavaScript engine that allows unauthenticated remote attackers to achieve arbitrary code execution with no user interaction required. The vulnerability affects all Firefox users and can be exploited over the network to gain complete control over an affected system. No patch is currently available.

Technical ContextAI

The vulnerability resides in the JavaScript Engine component of Mozilla Firefox, which is responsible for parsing, compiling, and executing JavaScript code. Use-after-free vulnerabilities occur when a program attempts to access memory that has been deallocated, potentially allowing an attacker to read freed memory contents or overwrite freed memory regions with controlled data. The affected product is identified via CPE string cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* covering all versions and configurations of Firefox. While a specific CWE identifier is not provided in the intelligence, use-after-free flaws typically correlate to CWE-416 (Use After Free), a memory safety violation that is particularly critical in memory-unsafe languages and complex software like JavaScript engines that manage heap allocation dynamically.

RemediationAI

Users and administrators must upgrade Mozilla Firefox to version 149 or later to remediate this use-after-free vulnerability. The patch is available through Firefox's automatic update mechanism, or users can manually download the latest version from https://www.mozilla.org/. For enterprise environments, Firefox ESR (Extended Support Release) users should check https://www.mozilla.org/security/advisories/mfsa2026-20/ for the corresponding ESR patch version. Until patching is completed, users can reduce exposure by disabling JavaScript execution in the browser (via browser extensions or configuration), though this severely degrades functionality for most modern websites. Organizations should prioritize this patch deployment, particularly for client-facing systems and developer workstations, given the broad user base and potential for exploitation via malicious web content.

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Same weakness CWE-416 – Use After Free

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CVE-2019-0708 CRITICAL POC
9.8
CVE-2015-5119 CRITICAL POC
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CVE-2014-0322 HIGH POC
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CVE-2012-4792 HIGH POC
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CVE-2009-4324 HIGH POC
7.8
CVE-2015-0313 CRITICAL POC
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CVE-2015-5122 CRITICAL POC
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CVE-2013-2551 HIGH POC
8.8

Same technique Information Disclosure

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CVE-2017-5638 CRITICAL POC
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CVE-2025-24813 CRITICAL POC
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CVE-2015-1701 HIGH POC
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CVE-2017-0147 HIGH POC
7.5
CVE-2014-6324 HIGH POC
8.8
CVE-2023-7028 CRITICAL POC
10.0
CVE-2017-0213 HIGH POC
7.3

Vendor StatusVendor

Debian

firefox
Release Status Fixed Version Urgency
sid vulnerable 148.0.2-1 -
(unstable) fixed (unfixed) -

SUSE

Severity: Critical
Product Status
openSUSE Tumbleweed Fixed
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed
SUSE Linux Enterprise Module for Desktop Applications 15 SP7 Fixed

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CVE-2026-4723 vulnerability details – vuln.today
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