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Red Hat EUVDEUVD-2026-14834

| CVE-2026-4709 HIGH
Improper Check for Unusual or Exceptional Conditions (CWE-754)
2026-03-24 mozilla
Information Disclosure Red Hat Mozilla Suse
7.5
CVSS 3.1 · NVD
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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

  1. Access
    Deliver crafted audio/video content
  2. Exploit
    Trigger boundary condition in GMP parser
  3. Impact
    Cause denial of service via crash

Vulnerability Assessment

Weakness
CWE
CWE-754
OWASP Top 10:2025
A10:2025 - Mishandling of Exceptional Conditions
ASVS 5.0
V16 - Security Logging and Error Handling Unusual condition handling
Exploitation Conditions

Remote unauthenticated exploitation against Firefox versions < 149, Firefox ESR < 115.34, and Firefox ESR < 140.9. No user interaction required. Victim must have the affected browser running with the GMP (Google Media Player) audio/video component enabled, which is default in most Firefox installations.
Impact

While CVSS score and vector are not yet assigned, the vulnerability is classified as information disclosure—a lower-severity impact category compared to code execution or denial of service. The exploitation likelihood is moderate: the vulnerability requires a victim to visit a malicious webpage or open a crafted media file, making it dependent on user interaction. SSVC analysis would classify this as having limited technical impact (information disclosure only) and requiring user interaction for exploitation. The fact that Mozilla issued three separate security advisories (MFSA2026-20, MFSA2026-21, MFSA2026-22) suggests coordinated disclosure across multiple Firefox release channels. No public exploit code or active exploitation has been reported at the time of advisory publication. The real-world risk is moderate: while not as critical as memory corruption vulnerabilities, information disclosure from the GMP process could leak user data, encryption keys, or other sensitive information during media playback.
Exploit ScenarioDerived

An attacker hosts a webpage containing a specially crafted audio or video file that triggers the boundary condition vulnerability in GMP's media processing code. When a victim visits the webpage in a vulnerable Firefox version, the browser's media player processes the malicious file, causing the GMP plugin process to read memory beyond buffer boundaries. The attacker extracts leaked memory contents through timing side-channels or error responses, potentially recovering session tokens, encryption keys, or other sensitive data resident in the plugin process memory at exploitation time. No public proof-of-concept has been disclosed, but the vulnerability is straightforward enough that exploitation is feasible for motivated threat actors.
This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).
Patch available 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 24, 2026

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.

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.

Affected VersionsENISA

Firefox ESR unspecified <140.9
Firefox unspecified <149
Firefox ESR unspecified <115.34

Affected Packages

euvd firefox_esr_unspecified fix: 115.34, 140.9
euvd firefox_unspecified fix: 149

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 2 packages in euvd

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Technical ContextAI · show details

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.

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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
Red Hat 6.1 MEDIUM

Primary rating from NVD.

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

2
Patch released
Mar 31, 2026 - 21:13 nvd
Patch available
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.

Executive ViewAI

Why It Matters

CVE-2026-4709 presents notable security risk rated CVSS 7.5. Exploitation could compromise the security of affected deployments. Organizations should apply vendor updates when available and consider compensating controls in the interim.

Business Impact: High
Compensating Controls

Apply vendor patch. If immediate patching is not feasible: (1) Implement network-level access controls to limit exposure; (2) Enable enhanced monitoring and alerting; (3) Apply principle of least privilege.

Threat Intelligence Overview

EPSS Score
0.0%
Top 96% exploitable
Data Quality
6 sources
Confidence: High
EUVD NVD CVE.org EPSS Vulnrichment Vendor VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity HIGH
CISA KEV No
Public POC No
EPSS 0.0%
Patch available Yes
Active threat No
Deciding rule
HIGH severity (CVSS 7.0-8.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision
Scheduled
Exploitation
None
System Exposure· derived
Open
Automatable
Yes
Human Impact
High
Technical Impact
Partial

Priority Score

38
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +38
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Information Disclosure MEDIUM

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.

Related Vulnerabilities in Firefox Multiple Memory and Boundary Vulnerabilities

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CVE-2026-4702 CRITICAL
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CVE-2026-4704 HIGH
7.5
CVE-2026-4706 HIGH
7.5
CVE-2026-4707 HIGH
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CVE-2026-4710 CRITICAL
9.8
CVE-2026-4711 CRITICAL
9.8
CVE-2026-4723 CRITICAL
9.8

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Same weakness CWE-754 – Improper Check for Unusual or Exceptional Conditions

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Same technique Information Disclosure

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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

References

Advisories & patches
ADVISORY https://access.redhat.com/errata/RHSA-2026:5930 ADVISORY https://access.redhat.com/errata/RHSA-2026:5931 ADVISORY https://access.redhat.com/errata/RHSA-2026:5932 ADVISORY https://access.redhat.com/errata/RHSA-2026:6188 ADVISORY https://access.redhat.com/errata/RHSA-2026:6342 ADVISORY https://access.redhat.com/errata/RHSA-2026:6917 ADVISORY https://access.redhat.com/errata/RHSA-2026:7837 ADVISORY https://access.redhat.com/errata/RHSA-2026:7838 ADVISORY https://access.redhat.com/errata/RHSA-2026:7839 ADVISORY https://access.redhat.com/errata/RHSA-2026:7840 ADVISORY https://access.redhat.com/errata/RHSA-2026:7841 ADVISORY https://access.redhat.com/errata/RHSA-2026:7842 ADVISORY https://access.redhat.com/errata/RHSA-2026:7843 ADVISORY https://access.redhat.com/errata/RHSA-2026:7845 ADVISORY https://access.redhat.com/errata/RHSA-2026:7858 ADVISORY https://access.redhat.com/errata/RHSA-2026:8284 ADVISORY https://access.redhat.com/errata/RHSA-2026:8285 ADVISORY https://access.redhat.com/errata/RHSA-2026:8286 ADVISORY https://access.redhat.com/errata/RHSA-2026:8287 ADVISORY https://access.redhat.com/errata/RHSA-2026:8288 ADVISORY https://access.redhat.com/errata/RHSA-2026:8289 ADVISORY https://access.redhat.com/errata/RHSA-2026:8290 ADVISORY https://access.redhat.com/errata/RHSA-2026:8315 ADVISORY https://access.redhat.com/errata/RHSA-2026:8427 ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2026-4709 ADVISORY https://vuldb.com/?id.352755 ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:1126/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:1127/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:1163/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:20978/ REF https://bugzilla.mozilla.org/show_bug.cgi?id=2016329 REF https://bugzilla.mozilla.org/show_bug.cgi?id=2016342 REF https://www.mozilla.org/security/advisories/mfsa2026-20/ REF https://www.mozilla.org/security/advisories/mfsa2026-21/ REF https://www.mozilla.org/security/advisories/mfsa2026-22/ REF https://www.mozilla.org/security/advisories/mfsa2026-23/ REF https://www.mozilla.org/security/advisories/mfsa2026-24/

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