CVE-2026-6777

Other issue in the Networking: DNS component

State: Published
Severity: 5.3 Medium
Published: Apr 21, 2026
Updated: May 27, 2026
Reserved: Apr 21, 2026

Description

Other issue in the Networking: DNS component. This vulnerability was fixed in Firefox 150 and Thunderbird 150.

Scores

CVSS	Score	Vector	Source
3.1	5.3 Medium	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L	CISA-ADP

Weaknesses

CWE-20 Improper Input Validation
CWE-400 Uncontrolled Resource Consumption
CWE-352 Cross-Site Request Forgery (CSRF)

Affected Products

Product	Versions
FirefoxMozilla	150 and laterNot affected
ThunderbirdMozilla	150 and laterNot affected

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2022726
https://www.mozilla.org/security/advisories/mfsa2026-30/
https://www.mozilla.org/security/advisories/mfsa2026-33/

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.