CVE-2026-6775 — Improper Restriction of Operations within the Bounds of a Memory Buffer in Mozilla Firefox

CWE-119 — Improper Restriction of Operations within the Bounds of a Memory BufferCWE-787 — Out-of-bounds Write7 documents6 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
Latest updateApr 28

Description

Incorrect boundary conditions in the WebRTC 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:L/I:N/A:NExploitability: 3.9 | Impact: 1.4

Affected Packages2 packages

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

🔴Vulnerability Details

2
VulDB
Mozilla Firefox up to 149 WebRTC memory corruption (Nessus ID 310638)↗2026-04-28
▶
GHSA
GHSA-wpg5-vr6r-jrcr: Incorrect boundary conditions in the WebRTC component↗2026-04-21
▶

📋Vendor Advisories

3
Red Hat
WebRTC: Firefox: WebRTC: System disruption and unauthorized control via incorrect boundary conditions↗2026-04-21
▶
Mozilla
Mozilla Foundation Security Advisory 2026-30: CVE-2026-6775↗
▶
Mozilla
Mozilla Foundation Security Advisory 2026-33: CVE-2026-6775↗
▶

💬Community

1
Bugzilla
CVE-2026-6775 WebRTC: Firefox: WebRTC: System disruption and unauthorized control via incorrect boundary conditions↗2026-04-21
▶
CVE-2026-6775 — Mozilla Firefox vulnerability | cvebase