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Mozilla CVE-2026-2806

CRITICAL
Use of Uninitialized Resource (CWE-908)
2026-02-24 security@mozilla.org
Information Disclosure Mozilla
Critical
Disputed · 9.1 NVD
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Severity by source

Sources disagree (Low–Critical)
NVD PRIMARY
9.1 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
SUSE
CRITICAL
qualitative
Red Hat
3.4 LOW
qualitative

vuln.today treats the vendor’s rating as authoritative. A higher third-party CVSS (e.g. CISA-ADP) is shown for transparency but does not drive the headline severity.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
High

Lifecycle Timeline

3
Patch released
Apr 10, 2026 - 14:30 nvd
Patch available
Analysis Generated
Mar 12, 2026 - 21:55 vuln.today
CVE Published
Feb 24, 2026 - 14:16 nvd
CRITICAL 9.1

DescriptionCVE.org

Uninitialized memory in the Graphics: Text component. This vulnerability affects Firefox < 148 and Thunderbird < 148.

AnalysisAI

Uninitialized memory read in Firefox Graphics Text component before 148. Text rendering may expose uninitialized memory contents.

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Craft malicious text rendering request
Exploit
Trigger uninitialized memory access in Graphics: Text component
Impact
Read sensitive data or crash application
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Vulnerability AssessmentAI

Exploitation No special conditions — remote unauthenticated exploitation against Firefox < 148 or Thunderbird < 148 with default configurations. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment CVSS 9.1. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Crafted text content triggers uninitialized memory reads, potentially leaking sensitive data from the heap.
Remediation Update Firefox/Thunderbird to 148+. Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Inventory all Firefox and Thunderbird installations below version 148 across the organization and assess business-critical dependencies on these applications. …

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Threat intelligence, references, and detailed analysis are available after sign-in.

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Vendor StatusVendor

SUSE

Severity: Critical
Product Status
openSUSE Tumbleweed Fixed
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed
SUSE Linux Enterprise Module for Desktop Applications 15 SP7 Fixed

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CVE-2026-2806 vulnerability details – vuln.today
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