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Mozilla CVE-2026-4718

| EUVDEUVD-2026-14851 HIGH
Reliance on Undefined, Unspecified, or Implementation-Defined Behavior (CWE-758)
2026-03-24 mozilla GHSA-9r85-xf24-6724
Mozilla Information Disclosure Red Hat Suse
High
Disputed · 8.1 NVD
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Severity by source

Sources disagree (Low–High)
NVD PRIMARY
8.1 HIGH
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
SUSE
HIGH
qualitative
Red Hat
3.4 LOW
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

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

Lifecycle Timeline

4
Patch released
Mar 31, 2026 - 21:13 nvd
Patch available
EUVD ID Assigned
Mar 24, 2026 - 12:45 euvd
EUVD-2026-14851
Analysis Generated
Mar 24, 2026 - 12:45 vuln.today
CVE Published
Mar 24, 2026 - 12:30 nvd
HIGH 8.1

DescriptionCVE.org

Undefined behavior in the WebRTC: Signaling component. This vulnerability affects Firefox < 149 and Firefox ESR < 140.9.

AnalysisAI

An undefined behavior vulnerability exists in the WebRTC Signaling component of Mozilla Firefox and Firefox ESR, potentially leading to information disclosure. This affects Firefox versions below 149 and Firefox ESR versions below 140.9. An attacker can exploit this through WebRTC signaling interactions to disclose sensitive information, though specific exploitation details remain limited in public disclosures.

Technical ContextAI

The vulnerability resides in the WebRTC signaling protocol implementation within Firefox's media communication stack. WebRTC signaling is responsible for negotiating connection parameters, media codecs, and session establishment between peers. The undefined behavior classification suggests memory safety issues such as use-after-free, buffer overflows, or race conditions in signaling message processing. Firefox (cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*) and Firefox ESR (cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*) are affected across all platforms. While no specific CWE was assigned in the CVE record, undefined behavior in network signaling protocols typically falls under CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) or CWE-362 (Concurrent Execution using Shared Resource with Improper Synchronization).

RemediationAI

Users should upgrade Mozilla Firefox to version 149 or later, and Firefox ESR users should upgrade to version 140.9 or later. These updates are available through the standard Firefox update mechanism (Help > About Firefox or Edit > Preferences > General > Firefox Updates). Enterprise deployments using Firefox ESR should prioritize the ESR channel update to 140.9 to maintain extended support compatibility. Organizations managing Firefox deployments via Group Policy (Windows) or centralized configuration management should push these updates immediately. Until patching is complete, users can disable WebRTC in about:config by setting media.peerconnection.enabled to false, though this will break WebRTC-dependent applications and videoconferencing features. For sensitive environments, consider using Firefox in a sandboxed container or virtual machine until patches are verified to be installed across all systems.

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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

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CVE-2026-4718 vulnerability details – vuln.today
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