Skip to main content

Firefox EUVDEUVD-2026-24088

| CVE-2026-6747 HIGH
Use After Free (CWE-416)
2026-04-21 mozilla GHSA-wvr4-56pf-cc47
Information Disclosure Memory Corruption Use After Free Mozilla
7.5
CVSS 3.1 · Vendor: mozilla
Share

Severity by source

Vendor (mozilla) 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 HIGH
qualitative

Primary rating from Vendor (mozilla).

CVSS VectorVendor: mozilla

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

8
Patch released
Apr 29, 2026 - 02:30 nvd
Patch available
Analysis Updated
Apr 22, 2026 - 00:44 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Apr 22, 2026 - 00:22 vuln.today
cvss_changed
Analysis Generated
Apr 21, 2026 - 18:22 vuln.today
CVSS changed
Apr 21, 2026 - 18:22 NVD
7.5 (HIGH)
EUVD ID Assigned
Apr 21, 2026 - 13:15 euvd
EUVD-2026-24088
Analysis Generated
Apr 21, 2026 - 13:15 vuln.today
CVE Published
Apr 21, 2026 - 12:40 nvd
HIGH 7.5

DescriptionCVE.org

Use-after-free in the WebRTC component. This vulnerability was fixed in Firefox 150 and Firefox ESR 140.10.

AnalysisAI

High-severity denial-of-service in Firefox WebRTC component allows remote unauthenticated attackers to crash the browser via network-based use-after-free memory corruption. Affects Firefox versions prior to 150 and Firefox ESR prior to 140.10. Vendor-released patches available (Firefox 150, Firefox ESR 140.10). CVSS 7.5 reflects high availability impact with low attack complexity and no privileges required. No public exploit identified at time of analysis, though SSVC framework classifies technical impact as partial and exploitation as none, suggesting limited real-world activity despite the theoretical ease of exploitation indicated by CVSS.

Technical ContextAI

This vulnerability resides in Firefox's WebRTC (Web Real-Time Communication) implementation, the browser component enabling peer-to-peer audio, video, and data sharing. Use-after-free (CWE-416) vulnerabilities occur when code continues to reference memory after it has been freed, leading to undefined behavior. In WebRTC contexts, this typically involves improper lifecycle management of media streams, peer connections, or ICE candidates during network negotiation. The affected CPE (cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*) encompasses both Firefox mainline and Extended Support Release (ESR) versions. While the CVSS vector indicates no confidentiality or integrity impact (C:N/I:N), use-after-free vulnerabilities are memory corruption issues that in some scenarios could be escalated beyond denial-of-service if an attacker can control the freed memory contents, though current vendor assessment limits impact to availability.

RemediationAI

Upgrade to Firefox 150 or later for mainline releases, or Firefox ESR 140.10 or later for Extended Support Release deployments. Mozilla security advisories confirm these versions contain the fix: MFSA2026-30 and MFSA2026-32 for standard Firefox available at https://www.mozilla.org/security/advisories/mfsa2026-30/ and https://www.mozilla.org/security/advisories/mfsa2026-32/, with ESR-specific guidance in MFSA2026-33 and MFSA2026-34 at https://www.mozilla.org/security/advisories/mfsa2026-33/ and https://www.mozilla.org/security/advisories/mfsa2026-34/. For environments unable to patch immediately, compensating controls include disabling WebRTC functionality via about:config settings (set media.peerconnection.enabled to false), though this breaks legitimate real-time communication features including video conferencing and peer-to-peer applications. Network-based mitigation through blocking WebRTC traffic (UDP ports 3478, 19302-19309, and high ephemeral ports used for STUN/TURN) provides defense-in-depth but severely impacts browser functionality for collaborative tools. Application allow-listing to restrict Firefox access to non-WebRTC sites is operationally complex and user-hostile. Given the vendor-released patches and DoS-only impact, prioritize rapid deployment of Firefox 150/ESR 140.10 over workarounds.

More in Mozilla

View all
CVE-2015-4495 HIGH POC
8.8 Aug 08

The PDF reader in Mozilla Firefox before 39.0.3, Firefox ESR 38.x before 38.1.1, and Firefox OS before 2.2 allows remote
CVE-2013-1690 HIGH POC
8.8 Jun 26

Mozilla Firefox before 22.0, Firefox ESR 17.x before 17.0.7, Thunderbird before 17.0.7, and Thunderbird ESR 17.x before

CVE-2013-0758 CRITICAL POC
9.3 Jan 13

Mozilla Firefox before 18.0, Firefox ESR 10.x before 10.0.12 and 17.x before 17.0.2, Thunderbird before 17.0.2, Thunderb
CVE-2013-0753 CRITICAL POC
9.3 Jan 13

Use-after-free vulnerability in the serializeToStream implementation in the XMLSerializer component in Mozilla Firefox b
CVE-2012-3993 CRITICAL POC
9.3 Oct 10

The Chrome Object Wrapper (COW) implementation in Mozilla Firefox before 16.0, Firefox ESR 10.x before 10.0.8, Thunderbi
CVE-2013-1710 CRITICAL POC
10.0 Aug 07

The crypto.generateCRMFRequest function in Mozilla Firefox before 23.0, Firefox ESR 17.x before 17.0.8, Thunderbird befo
CVE-2017-3823 HIGH POC
8.8 Feb 01

An issue was discovered in the Cisco WebEx Extension before 1.0.7 on Google Chrome, the ActiveTouch General Plugin Conta
CVE-2014-8636 HIGH POC
7.5 Jan 14

The XrayWrapper implementation in Mozilla Firefox before 35.0 and SeaMonkey before 2.32 does not properly interact with

CVE-2013-0757 CRITICAL POC
9.3 Jan 13

The Chrome Object Wrapper (COW) implementation in Mozilla Firefox before 18.0, Firefox ESR 17.x before 17.0.2, Thunderbi
CVE-2014-1510 CRITICAL POC
9.8 Mar 19

The Web IDL implementation in Mozilla Firefox before 28.0, Firefox ESR 24.x before 24.4, Thunderbird before 24.4, and Se
CVE-2014-1511 CRITICAL POC
9.8 Mar 19

Mozilla Firefox before 28.0, Firefox ESR 24.x before 24.4, Thunderbird before 24.4, and SeaMonkey before 2.25 allow remo
CVE-2013-0643 HIGH
8.8 Feb 27

The Firefox sandbox in Adobe Flash Player before 10.3.183.67 and 11.x before 11.6.602.171 on Windows and Mac OS X, and b

Same weakness CWE-416 – Use After Free

View all
CVE-2019-0708 CRITICAL POC
9.8
CVE-2015-5119 CRITICAL POC
9.8
CVE-2014-0322 HIGH POC
8.8
CVE-2012-4792 HIGH POC
8.8
CVE-2009-4324 HIGH POC
7.8
CVE-2015-0313 CRITICAL POC
9.8
CVE-2015-5122 CRITICAL POC
9.8
CVE-2013-2551 HIGH POC
8.8

Same technique Information Disclosure

View all
CVE-2013-2251 CRITICAL POC
9.8
CVE-2017-5638 CRITICAL POC
9.8
CVE-2025-24813 CRITICAL POC
9.8
CVE-2015-1701 HIGH POC
7.8
CVE-2017-0147 HIGH POC
7.5
CVE-2014-6324 HIGH POC
8.8
CVE-2023-7028 CRITICAL POC
10.0
CVE-2017-0213 HIGH POC
7.3

Vendor StatusVendor

SUSE

Severity: High
Product Status
SUSE Liberty Linux 10 Fixed
SUSE Liberty Linux 8 Fixed
SUSE Liberty Linux 9 Fixed
SUSE Linux Enterprise Server 16.0 SUSE Linux Enterprise Server for SAP applications 16.0 Fixed
openSUSE Leap 16.0 Fixed

Share

EUVD-2026-24088 vulnerability details – vuln.today
Back

This site uses cookies essential for authentication and security. No tracking or analytics cookies are used. Privacy Policy