Is CVE-2026-6776 actively exploited?

CVE-2026-6776 has no public evidence of in-the-wild exploitation as of 2026-04-22.

What is the CVSS score for CVE-2026-6776?

CVE-2026-6776 has a CVSS score of 7.8 (HIGH severity). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

How do I patch CVE-2026-6776?

Patch guidance is available from mozilla security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2026-6776.

Fix CVE-2026-6776 - HIGH mozilla firefox

Q: Which products are affected by CVE-2026-6776?

3 products: mozilla firefox, mozilla firefox, mozilla thunderbird.

Description

Incorrect boundary conditions in the WebRTC: Networking component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.

CVSS Metrics

Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack Vector: local
Complexity: low
Privileges: none
User Action: required
Scope: unchanged
Confidentiality: high
Integrity: high
Availability: high
Weaknesses: CWE-119 · Memory Buffer Errors

Metadata

Primary Vendor: MOZILLA
Published: 4/21/2026
Last Modified: 4/22/2026
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

CVE-2026-6776

Description

CVSS Metrics

Metadata

Affected Products

Remediation Guidance

Executive Summary