Is Memory Corruption affected by CVE-2026-2793?

A critical memory safety vulnerability affecting Firefox, Firefox ESR, Thunderbird, and Thunderbird ESR versions could allow attackers to execute arbitrary code on affected systems with no user interaction required.

CVE-2026-2793

Q: How to fix CVE-2026-2793?

Within 24 hours: Issue urgent security alert to all users; disable affected Firefox and Thunderbird versions if operationally feasible; implement network monitoring for exploitation attempts. Within 7 days: Deploy endpoint detection and response (EDR) tools to monitor for suspicious process execution and memory access patterns; restrict Firefox/Thunderbird usage to sandboxed environments or isolated systems until patch availability is confirmed. Within 30 days: Establish vendor communication protocol with Mozilla for patch release timeline; prepare expedited patch deployment procedures; conduct forensic review of any suspicious endpoint activity; implement application whitelisting to restrict browser and email client execution.

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

Memory safety bugs present in Firefox ESR 115.32, Firefox ESR 140.7, Thunderbird ESR 140.7, Firefox 147 and Thunderbird 147. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 148, Firefox ESR < 115.33, Firefox ESR < 140.8, Thunderbird < 148, and Thunderbird < 140.8.

Analysis

Memory safety bugs in Firefox ESR 115.32, ESR 140.7, and Firefox 147. Broader set of memory corruption issues than CVE-2026-2792.

Remediation

Within 24 hours: Issue urgent security alert to all users; disable affected Firefox and Thunderbird versions if operationally feasible; implement network monitoring for exploitation attempts. Within 7 days: Deploy endpoint detection and response (EDR) tools to monitor for suspicious process execution and memory access patterns; restrict Firefox/Thunderbird usage to sandboxed environments or isolated systems until patch availability is confirmed. …

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: +0.1

CVSS: +49

POC: 0

Vendor Status

CVE-2026-2793 vulnerability details – vuln.today

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CVE-2026-2793

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CVE-2026-2793

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External POC / Exploit Code