CVE-2026-84145
Received Received - Intake

Memory Corruption in Firefox

Publication date: 2026-09-01

Last updated on: 2026-09-01

Assigner: Mozilla Corporation

Description
Internally found bugs present in Firefox 154, Firefox ESR 153.1, Firefox ESR 140.14 and Firefox ESR 115.39. 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, Firefox ESR 115.40, Firefox ESR 140.15, 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-2026-84145
EUVD
EUVD-2026-69068

Affected Vendors & Products

Showing 3 associated CPEs
Vendor Product Version / Range
mozilla firefox 154
mozilla firefox esr
mozilla firefox 155

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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 internally found bugs in Firefox versions 154, ESR 153.1, ESR 140.14, and ESR 115.39. Some bugs showed evidence of memory corruption or other security defects, which could potentially be exploited with sufficient effort. It was fixed in Firefox 155 and newer ESR versions.

Impact Analysis

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

Mitigation Strategies

Update Firefox to version 155 or later, Firefox ESR 115.40 or later, Firefox ESR 140.15 or later, or Firefox ESR 153.2 or later to address the memory corruption and security defects.

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