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Mozilla CVE-2026-4704

| EUVDEUVD-2026-14823 HIGH
Uncontrolled Resource Consumption (CWE-400)
2026-03-24 mozilla GHSA-2mf6-25gq-26v8
Mozilla Denial Of Service 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
7.5 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-2026-14823
Analysis Generated
Mar 24, 2026 - 12:45 vuln.today
CVE Published
Mar 24, 2026 - 12:30 nvd
HIGH 7.5

DescriptionCVE.org

Denial-of-service in the WebRTC: Signaling component. This vulnerability affects Firefox < 149 and Firefox ESR < 140.9.

AnalysisAI

Mozilla Firefox versions prior to 149 and Firefox ESR prior to 140.9 are vulnerable to denial-of-service attacks through the WebRTC signaling component, which an unauthenticated remote attacker can exploit without user interaction to crash affected browsers. The vulnerability stems from improper resource handling and currently has no available patch, leaving users of affected versions at risk of service disruption.

Technical ContextAI

The vulnerability resides in the WebRTC signaling layer, which is responsible for establishing peer-to-peer connections by exchanging session descriptions and ICE candidates between endpoints. WebRTC signaling is a critical component of real-time communication in modern browsers and is implemented across both Mozilla Firefox (cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*) and Firefox ESR (cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*). The root cause appears to be improper input validation or resource management in the signaling message processing logic, likely falling under CWE categories related to improper input validation or denial-of-service mechanisms. When processing malformed or adversarially crafted signaling messages, the browser fails to handle the condition safely, leading to resource exhaustion or infinite loops.

RemediationAI

Users should upgrade Firefox to version 149 or later and Firefox ESR to version 140.9 or later to remediate this vulnerability. These patched versions are available through Mozilla's official distribution channels and auto-update mechanisms. Organizations managing large Firefox deployments should prioritize patching within their standard change management windows, as the vulnerability does not pose an immediate critical threat. As a temporary workaround pending patch deployment, organizations may restrict users' ability to initiate WebRTC connections by disabling WebRTC in privacy settings (via about:config, setting media.peerconnection.enabled to false), though this will disable legitimate real-time communication features. For additional guidance, refer to Mozilla's security 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: 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-2026-4704 vulnerability details – vuln.today
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