CVE-2026-84144
Received Received - Intake

Memory Corruption in Firefox and Firefox ESR

Publication date: 2026-09-01

Last updated on: 2026-09-01

Assigner: Mozilla Corporation

Description
Internally found bugs present in Firefox 154 and Firefox ESR 153.1. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. This vulnerability was fixed in Firefox 155 and Firefox ESR 153.2.

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Meta Information

Published
2026-09-01
Last Modified
2026-09-01
Generated
2026-09-01
AI Q&A
2026-09-01
EPSS Evaluated
N/A
NVD
CVE-2026-84144
EUVD
EUVD-2026-69092

Affected Vendors & Products

Showing 4 associated CPEs
Vendor Product Version / Range
mozilla firefox 154
mozilla firefox esr
mozilla firefox to 155 (inc)
mozilla firefox to 153.2 (inc)

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability involves bugs found in Firefox 154 and Firefox ESR 153.1 that could lead to memory corruption or other security issues. Mozilla suspects some of these bugs could be exploited with sufficient effort. The issue was resolved in Firefox 155 and Firefox ESR 153.2.

Detection Guidance

This vulnerability affects Firefox 154 and Firefox ESR 153.1. To detect it, check your installed Firefox version using commands like 'firefox --version' or 'about:support' in Firefox. If you are running Firefox 154 or ESR 153.1, the system is vulnerable and should be updated immediately.

Impact Analysis

If exploited, this vulnerability could allow attackers to execute arbitrary code, gain unauthorized access, or cause system crashes. Users running affected Firefox versions may be at risk of data breaches or malware infections.

Compliance Impact

This vulnerability could lead to unauthorized data access or leaks, violating GDPR's data protection requirements or HIPAA's safeguards for protected health information. Organizations using affected Firefox versions may face compliance violations and penalties.

Mitigation Strategies

Update Firefox to version 155 or Firefox ESR to version 153.2 or later to address the vulnerability.

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