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Mozilla CVE-2026-4709

| EUVDEUVD-2026-14834 HIGH
Improper Check for Unusual or Exceptional Conditions (CWE-754)
2026-03-24 mozilla
Mozilla Information Disclosure Red Hat Suse
7.5
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SUSE
HIGH
qualitative
Red Hat
6.1 MEDIUM
qualitative

Primary rating from NVD.

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
Patch released
Mar 31, 2026 - 21:13 nvd
Patch available
EUVD ID Assigned
Mar 24, 2026 - 12:45 euvd
EUVD-2026-14834
Analysis Generated
Mar 24, 2026 - 12:45 vuln.today
CVE Published
Mar 24, 2026 - 12:30 nvd
HIGH 7.5

DescriptionCVE.org

Incorrect boundary conditions in the Audio/Video: GMP component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, and Firefox ESR < 140.9.

AnalysisAI

A boundary condition vulnerability exists in Firefox's Audio/Video GMP (Gecko Media Plugin) component that enables information disclosure to attackers. This flaw affects Firefox versions below 149, Firefox ESR below 115.34, and Firefox ESR below 140.9. An attacker can exploit incorrect boundary condition handling in media processing to disclose sensitive information from the affected browser process.

Technical ContextAI

The vulnerability resides in the GMP (Gecko Media Plugin) subsystem, Mozilla's abstraction layer for audio and video codec handling. GMP delegates codec operations to sandboxed plugin processes to isolate untrusted media parsing. The specific defect involves incorrect boundary conditions—checks that validate memory access at array or buffer edges—within the audio/video processing pipeline. This class of error (CWE related to boundary condition violations) allows an attacker to read memory beyond intended buffer limits, potentially exposing sensitive data resident in the plugin process memory space. The affected CPEs (cpe:2.3:a:mozilla:firefox and cpe:2.3:a:mozilla:firefox_esr) indicate the vulnerability is present across both the mainline Firefox releases and the Extended Support Release (ESR) branches used by organizations requiring longer support cycles.

RemediationAI

Upgrade Mozilla Firefox to version 149 or later, or upgrade Firefox ESR to version 115.34 or later (for ESR 115.x users) or version 140.9 or later (for ESR 140.x users). Updates are available directly through Firefox's built-in auto-update mechanism or via https://www.mozilla.org/firefox/new/. For enterprise deployments using Firefox ESR, administrators should prioritize updating to the latest patched ESR minor version corresponding to their supported branch. Until patching is completed, consider disabling media playback from untrusted sources or restricting access to websites known to host malicious media content. Organizations can also deploy Mozilla's recommended security policies via Group Policy (Windows) or preference files (macOS/Linux) to enforce auto-update enforcement and restrict extension/plugin execution.

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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: High
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-2026-4709 vulnerability details – vuln.today
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