CVE-2026-84142
Received Received - Intake

Memory Corruption in Firefox 154

Publication date: 2026-09-01

Last updated on: 2026-09-01

Assigner: Mozilla Corporation

Description
Internally found bugs present in Firefox 154. 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.

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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-2026-84142
EUVD
EUVD-2026-69090

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
mozilla firefox 155
mozilla firefox to 155 (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 internally found bugs in Firefox 154 that showed evidence of memory corruption or other security-relevant defects. With sufficient effort, some of these bugs could potentially be exploited to compromise system security.

Detection Guidance

This vulnerability is specific to Firefox 154 and was fixed in Firefox 155. To detect it, check your Firefox version with commands like 'firefox --version' or 'about:support' in Firefox. If you are running Firefox 154, you are vulnerable.

Impact Analysis

If exploited, this vulnerability could allow attackers to execute arbitrary code, gain unauthorized access to sensitive data, or perform other malicious actions on affected systems running Firefox 154.

Compliance Impact

This vulnerability does not provide specific details about compliance impacts on standards like GDPR or HIPAA. The description focuses on memory corruption and potential exploitation risks in Firefox 154, but lacks information on regulatory or compliance implications.

Mitigation Strategies

Update Firefox to version 155 or later to address the vulnerability. Remove or disable any affected versions of Firefox from your system.

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