CVE-2026-6783 — Integer Overflow or Wraparound in Mozilla Firefox

CWE-190 — Integer Overflow or Wraparound6 documents5 sources
Severity
5.3MEDIUMNVD
EPSS
0.0%
top 88.84%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
Mozilla FirefoxMozilla Thunderbird
Timeline
PublishedApr 21

Description

Incorrect boundary conditions, integer overflow 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:L/A:NExploitability: 3.9 | Impact: 1.4

Affected Packages2 packages

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

🔴Vulnerability Details

1
GHSA
GHSA-cp9h-w8px-6q24: Incorrect boundary conditions, integer overflow in the Audio/Video: Playback component↗2026-04-21
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📋Vendor Advisories

3
Red Hat
firefox: Firefox: Arbitrary code execution or denial of service in Audio/Video Playback component↗2026-04-21
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Mozilla
Mozilla Foundation Security Advisory 2026-30: CVE-2026-6783↗
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Mozilla
Mozilla Foundation Security Advisory 2026-33: CVE-2026-6783↗
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💬Community

1
Bugzilla
CVE-2026-6783 firefox: Firefox: Arbitrary code execution or denial of service in Audio/Video Playback component↗2026-04-21
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CVE-2026-6783 — Integer Overflow or Wraparound | cvebase