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Mozilla Firefox CVE-2026-6775

| EUVDEUVD-2026-24116 MEDIUM
Buffer Overflow (CWE-119)
2026-04-21 mozilla GHSA-wpg5-vr6r-jrcr
Mozilla Buffer Overflow Red Hat Suse
5.3
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
5.3 MEDIUM
AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
SUSE
MEDIUM
qualitative
Red Hat
3.4 LOW
qualitative

Primary rating from NVD.

CVSS VectorNVD

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

Lifecycle Timeline

6
Patch released
Apr 29, 2026 - 02:30 nvd
Patch available
Analysis Generated
Apr 21, 2026 - 19:22 vuln.today
CVSS changed
Apr 21, 2026 - 19:22 NVD
5.3 (None) 5.3 (MEDIUM)
EUVD ID Assigned
Apr 21, 2026 - 13:15 euvd
EUVD-2026-24116
Analysis Generated
Apr 21, 2026 - 13:15 vuln.today
CVE Published
Apr 21, 2026 - 12:41 nvd
MEDIUM 5.3

DescriptionCVE.org

Incorrect boundary conditions in the WebRTC component. This vulnerability was fixed in Firefox 150.

AnalysisAI

Incorrect boundary conditions in Firefox's WebRTC component allow remote attackers to read limited memory contents without authentication. Firefox versions prior to 150 are affected by this low-confidentiality vulnerability, which CVSS rates at 5.3 due to network exploitability without user interaction, though CISA's SSVC framework indicates no current exploitation activity and limited technical impact.

Technical ContextAI

WebRTC (Web Real-Time Communication) is a browser-native component enabling peer-to-peer audio, video, and data transmission. The vulnerability stems from CWE-119 (improper restriction of operations within the bounds of a memory buffer), a classic buffer boundary violation. When WebRTC processes network-sourced data, insufficient validation of buffer boundaries allows an attacker to read adjacent memory beyond the intended allocation, potentially exposing cryptographic keys, session tokens, or other sensitive in-process data. The network attack vector (AV:N/AC:L/PR:N/UI:N) indicates the flaw can be triggered remotely via crafted WebRTC protocol frames without requiring authentication or user interaction.

RemediationAI

Vendor-released patch: Firefox 150 and later. Users should upgrade to Firefox 150 or newer via the browser's automatic update mechanism (Settings > About Firefox on Windows/Linux, or Firefox > About Firefox on macOS) or by downloading the latest version from https://www.mozilla.org/firefox/. Organizations managing Firefox enterprise deployments should use Mozilla's Maintenance Service or GPO (Windows) to enforce updates. No workarounds are available for users unable to upgrade immediately; however, disabling WebRTC in about:config (set media.peerconnection.enabled to false) will prevent exploitation of this specific component, though this breaks video/audio call functionality in web applications.

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Same weakness CWE-119 – Buffer Overflow

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Same technique Buffer Overflow

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Vendor StatusVendor

SUSE

Severity: Medium
Product Status
openSUSE Tumbleweed Fixed
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed
SUSE Linux Enterprise Module for Desktop Applications 15 SP7 Fixed

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CVE-2026-6775 vulnerability details – vuln.today
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