CVE-2026-6778 — NULL Pointer Dereference in Mozilla Firefox

CWE-476 — NULL Pointer DereferenceCWE-824 — Access of Uninitialized PointerCWE-825 — Expired Pointer Dereference5 documents4 sources
Severity
5.3MEDIUMNVD
EPSS
0.0%
top 86.78%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
Mozilla FirefoxMozilla Thunderbird
Timeline
PublishedApr 21

Description

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

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:LExploitability: 3.9 | Impact: 1.4

Affected Packages2 packages

▶Mozillamozilla/firefox< Firefox 150
▶Mozillamozilla/thunderbird< Thunderbird 150

🔴Vulnerability Details

1
GHSA
GHSA-xm94-m277-f852: Invalid pointer in the Audio/Video: Playback component↗2026-04-21
▶

📋Vendor Advisories

3
Red Hat
CVE-2026-6778: A flaw was found in Firefox↗2026-04-21
▶
Mozilla
Mozilla Foundation Security Advisory 2026-30: CVE-2026-6778↗
▶
Mozilla
Mozilla Foundation Security Advisory 2026-33: CVE-2026-6778↗
▶
CVE-2026-6778 — NULL Pointer Dereference in Mozilla | cvebase