CVE-2026-2804: Use-after-free in the JavaScript: WebAssembly component

Published Feb 24, 2026
·
Updated

Use-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 148 and Thunderbird 148.

Affected Software

4 affected componentsFixes available
Mozilla Firefox<148
148
Mozilla Thunderbird<148
148
Mozilla Firefox<148.0
Mozilla Thunderbird<148.0

Event History

Feb 24, 2026
CVE Published
via Mozilla·12:00 AM
Data Sourced
via Mozilla·12:00 AM
DescriptionSeverityAffected Software
Updated
via Mozilla·12:00 AM
Affected Software
CVE Published
via MITRE·01:33 PM
Data Sourced
via MITRE·01:33 PM
Description
Data Sourced
via NVD·02:16 PM
DescriptionSeverityWeaknessAffected Software
Jan 4, 58137
Event
via FIRST·12:58 PM

Parent advisories

This vulnerability appears in the following advisories.

Peer vulnerabilities

Found alongside the following vulnerabilities.

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Frequently Asked Questions

1

What is the severity of CVE-2026-2804?

The severity of CVE-2026-2804 is medium with a CVSS score of 5.4.

2

What type of vulnerability is CVE-2026-2804?

CVE-2026-2804 is classified as a Use-after-free vulnerability in the JavaScript: WebAssembly component.

3

How do I fix CVE-2026-2804?

To fix CVE-2026-2804, update to Firefox 148 or Thunderbird 148 or later versions.

4

What is the impact of CVE-2026-2804?

CVE-2026-2804 may allow unauthorized access to memory, potentially leading to information leakage.

5

Which software is affected by CVE-2026-2804?

CVE-2026-2804 affects Mozilla Firefox and Mozilla Thunderbird.

Company

Resources

Contact

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