CVE-2026-2806 — Use of Uninitialized Resource in Mozilla Firefox

CWE-908 — Use of Uninitialized ResourceCWE-457 — Use of Uninitialized Variable9 documents8 sources
Severity
9.1CRITICALNVD
EPSS
0.1%
top 80.98%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
Mozilla FirefoxMozilla Thunderbird
Timeline
PublishedFeb 24

Description

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

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:HExploitability: 3.9 | Impact: 5.2

Affected Packages2 packages

▶NVDmozilla/firefox< 148.0
▶NVDmozilla/thunderbird< 148.0

🔴Vulnerability Details

3
CVEList
Uninitialized memory in the Graphics: Text component↗2026-02-24
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GHSA
GHSA-hwjj-g6g7-p8cf: Uninitialized memory in the Graphics: Text component↗2026-02-24
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OSV
CVE-2026-2806: Uninitialized memory in the Graphics: Text component↗2026-02-24
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📋Vendor Advisories

4
Red Hat
firefox: thunderbird: Uninitialized memory in the Graphics: Text component↗2026-02-24
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Debian
CVE-2026-2806: firefox - Uninitialized memory in the Graphics: Text component. This vulnerability affects...↗2026
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Mozilla
Mozilla Foundation Security Advisory 2026-16: CVE-2026-2806↗
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Mozilla
Mozilla Foundation Security Advisory 2026-13: CVE-2026-2806↗
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🕵️Threat Intelligence

1
Wiz
CVE-2026-2806 Impact, Exploitability, and Mitigation Steps | Wiz↗
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CVE-2026-2806 — Use of Uninitialized Resource | cvebase