Is Use After Free affected by CVE-2026-2795?

A critical use-after-free vulnerability in Firefox and Thunderbird (versions below 148) exposes all users of these applications to potential remote code execution attacks with a CVSS score of 9.8.

CVE-2026-2795

Q: How to fix CVE-2026-2795?

Within 24 hours: Issue urgent security alert to all staff using Firefox or Thunderbird, advising immediate upgrade to version 148+; disable auto-update deferrals and enforce mandatory updates via MDM/Group Policy. Within 7 days: Complete inventory of all Firefox and Thunderbird installations across enterprise; verify 100% upgrade compliance through endpoint telemetry; block unpatched versions at the network gateway if feasible. Within 30 days: Conduct security audit of systems that may have been compromised during the vulnerability window; review logs for suspicious JavaScript activity; consider threat hunting for indicators of exploitation.

CRITICAL

2026-02-24 [email protected]

9.8

CVSS 3.1

CVSS Vector

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Patch Released

Apr 10, 2026 - 08:30 nvd

Patch available

Analysis Generated

Mar 12, 2026 - 21:55 vuln.today

CVE Published

Feb 24, 2026 - 14:16 nvd

CRITICAL 9.8

Description

Use-after-free in the JavaScript: GC component. This vulnerability affects Firefox < 148 and Thunderbird < 148.

Analysis

Use-after-free in Firefox JavaScript GC component before 148. GC-specific UAF affecting only mainline Firefox and Thunderbird.

Remediation

Within 24 hours: Issue urgent security alert to all staff using Firefox or Thunderbird, advising immediate upgrade to version 148+; disable auto-update deferrals and enforce mandatory updates via MDM/Group Policy. Within 7 days: Complete inventory of all Firefox and Thunderbird installations across enterprise; verify 100% upgrade compliance through endpoint telemetry; block unpatched versions at the network gateway if feasible. …

Analysis

Detailed AI-generated intelligence summary covering attack vector, impact assessment, affected versions, remediation steps, and indicators of compromise.

POChttps://••••••••••.com/exploit

PATCHhttps://••••••••••.com/patch

ADVISORYhttps://••••••••••.com/advisory

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Priority Score

Low Medium High Critical

KEV: 0

EPSS: +0.0

CVSS: +49

POC: 0

Vendor Status

CVE-2026-2795 vulnerability details – vuln.today

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CVE-2026-2795

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CVE-2026-2795

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