CVE-2026-74987
Received Received - Intake

Memory Corruption in Firefox ESR and Firefox

Publication date: 2026-08-18

Last updated on: 2026-08-18

Assigner: Mozilla Corporation

Description
Internally found bugs present in Firefox ESR 140.13, Firefox ESR 153.0 and Firefox 153. 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 154, Firefox ESR 140.14, and Firefox ESR 153.1.

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Meta Information

Published
2026-08-18
Last Modified
2026-08-18
Generated
2026-08-18
AI Q&A
2026-08-18
EPSS Evaluated
N/A
NVD
CVE-2026-74987
EUVD
EUVD-2026-60672

Affected Vendors & Products

Showing 5 associated CPEs
Vendor Product Version / Range
mozilla firefox to 154 (exc)
mozilla firefox to 140.14 (exc)
mozilla firefox to 153.1 (exc)
mozilla firefox 154
mozilla firefox esr

Helpful Resources

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 ESR 140.13, Firefox ESR 153.0, and Firefox 153. Some bugs showed evidence of memory corruption or other security-relevant defects. With enough effort, some could potentially be exploited to compromise system security.

Detection Guidance

This vulnerability affects Firefox ESR versions 140.13, 153.0, and Firefox 153. No specific detection commands are provided in the context. Check installed Firefox versions with commands like 'firefox --version' or 'apt list --installed | grep firefox' to identify vulnerable versions.

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 face data breaches, malware infections, or loss of sensitive information.

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 may face fines or legal penalties if affected systems handle regulated data.

Mitigation Strategies

Update Firefox to version 154 or later, Firefox ESR 140.14, or Firefox ESR 153.1. Disable automatic updates temporarily if needed, then verify the update with 'firefox --version'.

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