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Red Hat CVE-2026-4716

| EUVDEUVD-2026-14848 CRITICAL
Use of Uninitialized Resource (CWE-908)
2026-03-24 mozilla
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
6.1 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

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-2026-14848
Analysis Generated
Mar 24, 2026 - 12:45 vuln.today
CVE Published
Mar 24, 2026 - 12:30 nvd
CRITICAL 9.1

DescriptionCVE.org

Incorrect boundary conditions, uninitialized memory in the JavaScript Engine component. This vulnerability affects Firefox < 149 and Firefox ESR < 140.9.

AnalysisAI

Mozilla Firefox versions below 149 and Firefox ESR below 140.9 contain memory safety flaws in the JavaScript Engine that enable remote code execution and denial of service attacks without user interaction or special privileges. An unauthenticated attacker can exploit improper boundary condition handling and uninitialized memory to achieve high-impact confidentiality violations and system availability disruption. No patch is currently available.

Technical ContextAI

The vulnerability resides in Mozilla Firefox's JavaScript Engine (SpiderMonkey), a core component responsible for parsing, compiling, and executing JavaScript code. The root cause involves improper boundary condition checks combined with uninitialized memory access patterns, classified under CWE categories related to memory safety (CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer, or similar). The affected products span both the mainline Firefox release (cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*) and the extended support release track (cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*), indicating this is a critical component affecting millions of browser instances. Improper handling of memory boundaries in a JIT-compiled or interpreted JavaScript context could allow out-of-bounds reads to access adjacent memory regions containing sensitive data.

RemediationAI

Users should immediately update Firefox to version 149 or later, and Firefox ESR users should upgrade to version 140.9 or later. Both updates are available through the official Mozilla website and automatic update mechanisms within the browser. Until patching can be deployed, users should disable JavaScript in the browser settings if feasible for their workflow, though this severely limits functionality. System administrators can enforce updates via group policy (Windows) or configuration management tools, and should prioritize rollout given the information disclosure risk. Refer to the complete remediation guidance in Mozilla's official advisories at https://www.mozilla.org/security/advisories/mfsa2026-20/ and https://www.mozilla.org/security/advisories/mfsa2026-22/.

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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-2026-4716 vulnerability details – vuln.today
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