CVE & CISA-KEV Catalog

CVE-2026-2806

CRITICAL
9.1
CVSS v3
NVD

Description

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

CWE-908CWE-457

How to fix

Remediation Available
firefoxDebian
Fixed in:148.0-1CVE-2026-2806
DeveloperEditionWindows application
Affected:148.0Fixed in:148.0Mozilla
Mozilla Firefox (en-US)Windows application
Affected:148.0Fixed in:148.0Mozilla
Mozilla Thunderbird (en-US)Windows application
Affected:148.0Fixed in:148.0Mozilla

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged

Impact

ConfidentialityHigh
IntegrityNone
AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Exploit Intelligence

0.39%probability of exploitation in 30 days
32ndpercentile

Low risk: more likely to be exploited than 32% of all known CVEs.

References

Vendor Advisory2
Other references1

Related Vulnerabilities

Other CWE-908 vulnerabilities, ordered by exploit likelihood. View all

CVESeverityCVSSEPSSExploitedFix
CVE-2025-5777High7.5100%KEV + RansomFix
CVE-2023-24941Critical9.895%-Fix
CVE-2007-1751High9.361%--
CVE-2008-0081Critical9.858%--
CVE-2020-1934Medium5.352%-Fix
CVE-2008-3475High8.840%--

Common questions

How do I fix CVE-2026-2806?

Published advisories record a fix for 4 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2026-2806 being actively exploited?

Not that we know of. CVE-2026-2806 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.39% is the estimated probability that it will be exploited in the next 30 days. That is higher than 32% of all scored CVEs.

How severe is CVE-2026-2806?

CVE-2026-2806 has a CVSS v3 base score of 9.1, rated critical. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2026-2806 affect?

Published advisories record a fix for firefox (Debian), DeveloperEdition (Windows application), Mozilla Firefox (en-US) (Windows application), Mozilla Thunderbird (en-US) (Windows application). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-13.