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Red Hat CVE-2026-4715

| EUVDEUVD-2026-14845 CRITICAL
Use of Uninitialized Resource (CWE-908)
2026-03-24 mozilla GHSA-8cfw-c9hx-8f9v
Information Disclosure Red Hat Mozilla Suse
Critical
Disputed · 9.1 NVD
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Severity by source

Sources disagree (Medium–Critical)
NVD PRIMARY
9.1 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
SUSE
CRITICAL
qualitative
Red Hat
6.5 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

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
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-2026-14845
Analysis Generated
Mar 24, 2026 - 12:45 vuln.today
CVE Published
Mar 24, 2026 - 12:30 nvd
CRITICAL 9.1

DescriptionCVE.org

Uninitialized memory in the Graphics: Canvas2D component. This vulnerability affects Firefox < 149 and Firefox ESR < 140.9.

AnalysisAI

An uninitialized memory vulnerability exists in Firefox and Firefox ESR's Graphics Canvas2D component that can lead to information disclosure. Firefox versions prior to 149 and Firefox ESR versions prior to 140.9 are affected. An attacker can exploit this by crafting malicious Canvas2D operations to read uninitialized memory contents from the graphics rendering pipeline, potentially exposing sensitive data from the browser process.

Technical ContextAI

The vulnerability resides in the Canvas2D graphics rendering component of the Gecko engine used by Mozilla Firefox. Canvas2D is a Web API that allows web pages to draw graphics via JavaScript, implemented through the Graphics subsystem. The root cause is classified as CWE (uninitialized memory), indicating that memory buffers used during Canvas2D operations are not properly initialized before use. This allows an attacker-controlled script running in a web context to access residual data from previous allocations. The affected products are identified via CPE as cpe:2.3:a:mozilla:firefox and cpe:2.3:a:mozilla:firefox_esr, affecting the entire product families below specified version thresholds.

RemediationAI

Immediately upgrade Mozilla Firefox to version 149 or later, and Firefox ESR to version 140.9 or later. Users unable to immediately patch should avoid visiting untrusted websites and consider disabling JavaScript in the browser settings as a temporary measure, though this significantly limits functionality. Administrators managing Firefox deployments should enable automatic updates through Group Policy (Windows) or Firefox policies.json (cross-platform) to ensure rapid patching. Verify the upgrade by checking About Firefox and confirming the version number meets the minimum requirements specified in the security advisories at https://www.mozilla.org/security/advisories/mfsa2026-20/ and https://www.mozilla.org/security/advisories/mfsa2026-22/.

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Same weakness CWE-908 – Use of Uninitialized Resource

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Vendor StatusVendor

Debian

firefox
Release Status Fixed Version Urgency
sid vulnerable 148.0.2-1 -
(unstable) fixed (unfixed) -
firefox-esr
Release Status Fixed Version Urgency
bullseye vulnerable 115.14.0esr-1~deb11u1 -
bullseye (security) vulnerable 140.8.0esr-1~deb11u1 -
bookworm vulnerable 128.14.0esr-1~deb12u1 -
bookworm (security) vulnerable 140.8.0esr-1~deb12u1 -
trixie (security), trixie vulnerable 140.8.0esr-1~deb13u1 -
forky, sid vulnerable 140.8.0esr-1 -
(unstable) fixed (unfixed) -

SUSE

Severity: Critical
Product Status
Image SLES15-SP5-SAP-Azure-LI-BYOS Image SLES15-SP5-SAP-Azure-LI-BYOS-Production Image SLES15-SP5-SAP-Azure-VLI-BYOS Image SLES15-SP5-SAP-Azure-VLI-BYOS-Production Image SLES15-SP6-SAP-Azure-LI-BYOS Image SLES15-SP6-SAP-Azure-LI-BYOS-Production Image SLES15-SP6-SAP-Azure-VLI-BYOS Image SLES15-SP6-SAP-Azure-VLI-BYOS-Production Image SLES15-SP7-SAP-Azure-LI-BYOS-Production Image SLES15-SP7-SAP-Azure-VLI-BYOS-Production Affected
SUSE Liberty Linux 10 Fixed
SUSE Liberty Linux 8 Fixed
SUSE Liberty Linux 9 Fixed
SUSE Linux Enterprise Desktop 15 SP7 SUSE Linux Enterprise Server 15 SP7 SUSE Linux Enterprise Server for SAP Applications 15 SP7 Fixed

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CVE-2026-4715 vulnerability details – vuln.today
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