Use-After-Free Vulnerability in Firefox by Mozilla
CVE-2026-2798

8.8HIGH

Key Information:

Vendor

Mozilla
Status
Firefox
Thunderbird
Vendor
CVE Published:
24 February 2026

What is CVE-2026-2798?

A use-after-free vulnerability has been identified in the DOM: Core & HTML component of Mozilla's Firefox browser, specifically affecting versions prior to 148. This flaw can enable an attacker to exploit freed memory, potentially leading to arbitrary code execution or other harmful consequences by manipulating the web applications processed by the browser. Users are encouraged to update 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=2014136
https://www.mozilla.org/security/advisories/mfsa2026-13/
https://www.mozilla.org/security/advisories/mfsa2026-16/

CVSS V3.1

Score:
8.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Sajeeb Lohani
JSON
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