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Mozilla CVE-2026-4705

| EUVDEUVD-2026-14825 CRITICAL
Reliance on Undefined, Unspecified, or Implementation-Defined Behavior (CWE-758)
2026-03-24 mozilla GHSA-mrxg-j2xh-wg8q
Information Disclosure Mozilla Red Hat Suse
Critical
Disputed · 9.8 NVD
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Severity by source

Sources disagree (Medium–Critical)
NVD PRIMARY
9.8 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SUSE
CRITICAL
qualitative
Red Hat
6.5 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

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
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-2026-14825
Analysis Generated
Mar 24, 2026 - 12:45 vuln.today
CVE Published
Mar 24, 2026 - 12:30 nvd
CRITICAL 9.8

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 enabling information disclosure attacks. Firefox versions prior to 149 and Firefox ESR versions prior to 140.9 are affected. While specific exploitation mechanics are not fully detailed in available public sources, the vulnerability is classified as an information disclosure issue that could allow attackers to extract sensitive data through malformed WebRTC signaling messages.

Technical ContextAI

WebRTC (Web Real-Time Communication) is a critical browser technology enabling peer-to-peer audio, video, and data transmission directly between browsers. The signaling component is responsible for establishing and negotiating these connections through the exchange of Session Description Protocol (SDP) messages and ICE candidates. Undefined behavior in this component suggests memory safety issues—potentially use-after-free, buffer overflows, or type confusion—within the signaling state machine or message parsing logic. The vulnerability affects Mozilla Firefox (cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*) and Firefox ESR (cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*), both of which use the same Gecko rendering engine and WebRTC implementation. The CWE classification is not provided, but undefined behavior in protocol handlers typically maps to CWE-457 (Use of Uninitialized Variable) or CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer).

RemediationAI

Immediately upgrade to Firefox 149 or later, or Firefox ESR 140.9 or later, depending on your release track—see https://www.mozilla.org/security/advisories/mfsa2026-20/ and https://www.mozilla.org/security/advisories/mfsa2026-22/ for official guidance. For enterprise deployments unable to patch immediately, consider restricting WebRTC functionality via browser policy (disable-webrtc flag or equivalent) or implementing network-level controls to limit exposure to untrusted websites that might exploit signaling parsing flaws. Ensure automatic updates are enabled to receive this and future security patches promptly. Monitor Mozilla's security advisories for any additional details or related issues.

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Same weakness CWE-758 – Reliance on Undefined, Unspecified, or Implementation-Defined Behavior

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9.1
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8.8
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CVE-2024-4774 MEDIUM
6.5
CVE-2026-34537 MEDIUM
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CVE-2026-34533 MEDIUM
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CVE-2026-34549 MEDIUM
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Same technique Information Disclosure

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CVE-2013-2251 CRITICAL POC
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7.3

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-2026-4705 vulnerability details – vuln.today
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