CVE-2026-6781 — Uncontrolled Resource Consumption in Mozilla Firefox

CWE-400 — Uncontrolled Resource ConsumptionCWE-770 — Allocation of Resources Without Limits or Throttling7 documents6 sources
Severity
7.5HIGHNVD
EPSS
0.1%
top 83.81%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
Mozilla FirefoxMozilla Thunderbird
Timeline
PublishedApr 21
Latest updateApr 28

Description

Denial-of-service 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:HExploitability: 3.9 | Impact: 3.6

Affected Packages2 packages

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

🔴Vulnerability Details

2
VulDB
Mozilla Firefox up to 149 Playback denial of service (Nessus ID 310635)↗2026-04-28
▶
GHSA
GHSA-68p2-8vqp-fwx7: Denial-of-service in the Audio/Video: Playback component↗2026-04-21
▶

📋Vendor Advisories

3
Red Hat
firefox: Firefox: Denial of Service in Audio/Video Playback component↗2026-04-21
▶
Mozilla
Mozilla Foundation Security Advisory 2026-30: CVE-2026-6781↗
▶
Mozilla
Mozilla Foundation Security Advisory 2026-33: CVE-2026-6781↗
▶

💬Community

1
Bugzilla
CVE-2026-6781 firefox: Firefox: Denial of Service in Audio/Video Playback component↗2026-04-21
▶
CVE-2026-6781 — Uncontrolled Resource Consumption | cvebase