What is CVE-2026-2806?

CVE-2026-2806 is a critical-severity vulnerability in Mozilla Firefox, classified under Use of Uninitialized Resource. CVSS score: 9.1/10. Published 2026-02-24.

How severe is CVE-2026-2806?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Vulnerability in Mozilla Firefox

CVE-2026-2806

Uninitialized memory in the Graphics: Text component. This vulnerability was fixed in Firefox 148 and Thunderbird 148.

EPSS: 0.004 (30.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H.

Affected products

Mozilla Firefox — versions 148
Mozilla Thunderbird — versions 148

Weakness classification (CWE)

CWE-908 — Use of Uninitialized Resource
CWE-457

References

security@mozilla.org (Permissions Required)
security@mozilla.org (Vendor Advisory)
security@mozilla.org (Vendor Advisory)

Frequently asked questions

What is CVE-2026-2806?: CVE-2026-2806 is a critical-severity vulnerability in Mozilla Firefox, classified under Use of Uninitialized Resource. CVSS score: 9.1/10. Published 2026-02-24.
How severe is CVE-2026-2806?: Critical severity. CVSS v3 base score is 9.1 out of 10.