CVE-2026-16412

Modified Modified - Updated After Analysis

Memory Corruption Flaws in Firefox ESR and Firefox

Publication date: 2026-07-21

Last updated on: 2026-07-24

Assigner: Mozilla Corporation

Description

Memory safety bugs present in Firefox ESR 140.12 and Firefox 152. 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 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-07-21

Last Modified

2026-07-24

Generated

2026-08-10

AI Q&A

2026-07-21

EPSS Evaluated

2026-08-09

NVD

CVE-2026-16412

EUVD

EUVD-2026-46250

Affected Vendors & Products

Vendor	Product	Version / Range
mozilla	firefox	to 153.0.0 (exc)
mozilla	firefox	From 140.1.0 (inc) to 140.13.0 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-119	The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.

Attack-Flow Graph

Executive Summary

This vulnerability involves memory safety bugs in Firefox ESR 140.12 and Firefox 152. These bugs can lead to memory corruption, which attackers might exploit to run arbitrary code on affected systems. The issue was resolved in Firefox 153 and Firefox ESR 140.13.

Detection Guidance

This vulnerability affects Firefox ESR 140.12 and Firefox 152. Check your Firefox version with about:support in the browser or run 'firefox --version' in the terminal. If you have versions 140.12 or 152 installed, update immediately to Firefox 153 or Firefox ESR 140.13.

Impact Analysis

If exploited, this vulnerability could allow attackers to execute malicious code on your system, potentially leading to data theft, unauthorized access, or system compromise. Users running vulnerable versions should update immediately.

Compliance Impact

This vulnerability involves memory safety bugs in Firefox ESR and Firefox that could lead to memory corruption and potential arbitrary code execution. Such vulnerabilities may compromise data confidentiality and integrity, which are critical for compliance with GDPR and HIPAA. However, the provided CVE data does not specify direct impacts on compliance standards.

Mitigation Strategies

Update Firefox to version 153 or Firefox ESR to version 140.13 or later to address the memory safety bugs and prevent potential exploitation.

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