Boundary Condition Flaw in Firefox's WebAssembly Component
CVE-2026-2801

7.5HIGH

Key Information:

Vendor

Mozilla
Status
Firefox
Thunderbird
Vendor
CVE Published:
24 February 2026

What is CVE-2026-2801?

A boundary condition vulnerability in the WebAssembly component of Firefox can lead to insecure processing of data. This issue affects versions of Firefox earlier than 148, potentially allowing malicious content to exploit this flaw. Users are advised to upgrade to the latest version to mitigate risks associated with this vulnerability.

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Affected Version(s)

Firefox < 148

Thunderbird < 148

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2009901
https://www.mozilla.org/security/advisories/mfsa2026-13/
https://www.mozilla.org/security/advisories/mfsa2026-16/

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Kanaru Sato
JSON
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