CVE-2026-2794 Mozilla CVE debrief

Who should care

This vulnerability affects users of Firefox and Firefox Focus for Android. Given its high severity and potential for information disclosure, users and administrators should prioritize updating to Firefox version 148 or later. Additionally, defenders and security teams should be aware of this vulnerability to ensure proper mitigation and protection of sensitive information.

Technical summary

CVE-2026-2794 is caused by an information disclosure issue due to uninitialized memory in Firefox and Firefox Focus for Android. The vulnerability has a CVSS score of 7.5 and is classified as HIGH severity. The affected product is Mozilla's Firefox, with the vulnerability being fixed in version 148. The Common Weakness Enumeration (CWE) associated with this vulnerability is CWE-908. The attack vector is network-based, and the vulnerability does not require user interaction or privileges.

Defensive priority

High priority should be given to updating Firefox to version 148 or later to mitigate this vulnerability. Defenders should also ensure that all instances of Firefox and Firefox Focus for Android within their organization are updated to prevent potential exploitation.

Recommended defensive actions

• Update Firefox to version 148 or later.
• Ensure all instances of Firefox Focus for Android are updated to the latest version.
• Review and update organizational policies to include checks for and mitigation of this vulnerability.
• Monitor for any suspicious activity that could be related to this vulnerability.
• Consider implementing additional security measures to protect sensitive information.

Evidence notes

The CVE-2026-2794 record was obtained from the official CVE database and the National Vulnerability Database (NVD). The vulnerability was disclosed by Mozilla and addressed in Firefox version 148. Additional information and mitigation strategies can be found in the Mozilla security advisories and related bug reports.

Official resources