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Mozilla Firefox CVE-2026-6778

| EUVDEUVD-2026-24119 MEDIUM
NULL Pointer Dereference (CWE-476)
2026-04-21 mozilla GHSA-xm94-m277-f852
Null Pointer Dereference Denial Of Service Mozilla 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:N/I:N/A:L
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:N/I:N/A:L
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low

Lifecycle Timeline

6
Patch released
Apr 29, 2026 - 02:30 nvd
Patch available
Analysis Generated
Apr 21, 2026 - 18:25 vuln.today
CVSS changed
Apr 21, 2026 - 18:22 NVD
5.3 (None) 5.3 (MEDIUM)
EUVD ID Assigned
Apr 21, 2026 - 13:15 euvd
EUVD-2026-24119
Analysis Generated
Apr 21, 2026 - 13:15 vuln.today
CVE Published
Apr 21, 2026 - 12:41 nvd
MEDIUM 5.3

DescriptionCVE.org

Invalid pointer in the Audio/Video: Playback component. This vulnerability was fixed in Firefox 150.

AnalysisAI

Denial of service via null pointer dereference in Firefox's Audio/Video Playback component allows remote attackers to crash the browser without user interaction. The vulnerability affects Firefox versions prior to 150 and requires only a network connection to trigger, resulting in availability loss but not code execution or data compromise. No active exploitation has been confirmed at time of analysis.

Technical ContextAI

The vulnerability exists in the Audio/Video Playback component of Firefox, specifically a null pointer dereference classified as CWE-476 (Null Pointer Dereference). This flaw occurs when the playback engine fails to properly validate pointer references before dereferencing them, typically during media stream processing or codec initialization. The attack vector is network-based with no special privilege or user interaction requirements (CVSS AV:N/AC:L/PR:N/UI:N), meaning a malicious or compromised media server could serve specially crafted audio or video content that triggers the invalid pointer access when Firefox attempts to render it.

RemediationAI

Upgrade Firefox to version 150 or later, which contains the fix for the null pointer dereference. Users can check for updates via Firefox Help > About Firefox, which will automatically download and install the latest version. Mozilla's official security advisory is available at https://www.mozilla.org/security/advisories/mfsa2026-30/. For enterprise environments unable to auto-update, manual download of Firefox 150+ from mozilla.org is required. No workarounds exist to prevent the vulnerability in older versions; patching is the only remediation. The fix involves proper validation of pointer references before dereferencing in the Audio/Video Playback component, preventing the crash condition.

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Same weakness CWE-476 – NULL Pointer Dereference

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7.5
CVE-2015-3194 HIGH
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CVE-2026-21525 MEDIUM
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CVE-2017-0016 MEDIUM
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Same technique Null Pointer Dereference

View all
CVE-2016-0742 HIGH
7.5
CVE-2014-3470 MEDIUM
4.3
CVE-2017-3730 HIGH POC
7.5
CVE-2017-3169 CRITICAL POC
9.8
CVE-2016-4957 HIGH
7.5
CVE-2015-3194 HIGH
7.5
CVE-2026-21525 MEDIUM
6.2
CVE-2017-0016 MEDIUM
5.9

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-2026-6778 vulnerability details – vuln.today
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