CVE-2026-2801: Incorrect boundary conditions in the JavaScript: WebAssembly component

Published Feb 24, 2026
·
Updated

Incorrect boundary conditions 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·12:07 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-2026-2801?

CVE-2026-2801 has a high severity rating of 7.5 according to CVSS 3.1.

2

How do I fix CVE-2026-2801?

To fix CVE-2026-2801, update Mozilla Firefox or Mozilla Thunderbird to version 148 or later.

3

What software is affected by CVE-2026-2801?

CVE-2026-2801 affects Mozilla Firefox and Mozilla Thunderbird.

4

What kind of vulnerability is CVE-2026-2801?

CVE-2026-2801 is an incorrect boundary conditions vulnerability in the JavaScript: WebAssembly component.

5

When was CVE-2026-2801 published?

CVE-2026-2801 was published on February 24, 2026.

Company

Resources

Contact

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