CVE-2026-6783

Published: Apr 21, 2026Modified: Apr 22, 2026

5.3

Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Exploitability: 3.9 / Impact: 1.4

Source: NVD

Description

Incorrect boundary conditions, integer overflow in the Audio/Video: Playback component. This vulnerability was fixed in Firefox 150 and Thunderbird 150.

Affected (2)

Products: Mozilla: Firefox, Thunderbird

Mozilla

2 products

Firefox

Thunderbird

Configuration A

2 vulnerable

Vulnerable Software	Affected Versions
Mozilla Firefox	Before 150.0
Mozilla Thunderbird	Before 150.0

Related CWEs

CWE-190

Integer Overflow or Wraparound

The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.

References (3)

https://bugzilla.mozilla.org/show_bug.cgi?id=2027564

Source: security@mozilla.org

Permissions Required

https://www.mozilla.org/security/advisories/mfsa2026-30/

Source: security@mozilla.org

Vendor Advisory

https://www.mozilla.org/security/advisories/mfsa2026-33/

Source: security@mozilla.org

Vendor Advisory

Timeline

No history available yet.