CVE-2026-2793
Modified Modified - Updated After Analysis

Memory Corruption in Firefox and Thunderbird ESR Enables Code Execution

Publication date: 2026-02-24

Last updated on: 2026-06-30

Assigner: Mozilla Corporation

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 was fixed in Firefox 148, Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published
2026-02-24
Last Modified
2026-06-30
Generated
2026-07-06
AI Q&A
2026-02-24
EPSS Evaluated
2026-07-05
NVD
CVE-2026-2793

Affected Vendors & Products

Showing 5 associated CPEs
Vendor Product Version / Range
mozilla firefox to 148.0 (exc)
mozilla thunderbird to 148.0 (exc)
mozilla firefox to 115.33.0 (exc)
mozilla firefox From 128.0 (inc) to 140.8.0 (exc)
mozilla thunderbird to 140.8.0 (exc)

Helpful Resources

Exploitability

CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-787 The product writes data past the end, or before the beginning, of the intended buffer.

Attack-Flow Graph

AI Quick Actions

Instant insights powered by AI
Executive Summary

This vulnerability involves memory safety bugs found in specific versions of Firefox and Thunderbird, including 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, which means that the software could behave unpredictably or incorrectly due to improper handling of memory.

It is presumed that with enough effort, some of these bugs could be exploited to run arbitrary code, meaning an attacker could potentially execute malicious code on the affected system.

Impact Analysis

The impact of this vulnerability could be severe because it may allow an attacker to execute arbitrary code on your system.

This could lead to unauthorized access, data theft, system compromise, or other malicious activities depending on the attacker's intent.

Compliance Impact

I don't know

Detection Guidance

I don't know

Mitigation Strategies

I don't know

Chat Assistant

Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-2793. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70

EPSS Chart