CVE-2026-8090

Modified Modified - Updated After Analysis

Use-after-free in Firefox DOM Networking

Publication date: 2026-05-07

Last updated on: 2026-06-30

Assigner: Mozilla Corporation

Description

Use-after-free in the DOM: Networking component. This vulnerability was fixed in Firefox 150.0.2, Firefox ESR 140.10.2, Firefox ESR 115.35.2, Thunderbird 150.0.2, and Thunderbird 140.10.2.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-05-07

Last Modified

2026-06-30

Generated

2026-07-07

AI Q&A

2026-05-07

EPSS Evaluated

2026-07-05

NVD

CVE-2026-8090

EUVD

EUVD-2026-28361

Affected Vendors & Products

Vendor	Product	Version / Range
mozilla	firefox	to 115.35.2 (exc)
mozilla	firefox	to 150.0.2 (exc)
mozilla	firefox	From 128.0 (inc) to 140.10.2 (exc)
mozilla	thunderbird	to 150.0.2 (exc)
mozilla	thunderbird	to 140.10.2 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-825	The product dereferences a pointer that contains a location for memory that was previously valid, but is no longer valid.
CWE-416	The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

Attack-Flow Graph

Executive Summary

This vulnerability is a use-after-free issue in the DOM networking component of Mozilla Firefox. A use-after-free vulnerability occurs when a program continues to use a pointer after the memory it points to has been freed, which can lead to unexpected behavior or security risks.

This specific vulnerability was addressed and fixed in Firefox versions 150.0.2, Firefox ESR 140.10.2, and Firefox ESR 115.35.2.

Mitigation Strategies

To mitigate this use-after-free vulnerability in the DOM Networking component, you should update your Firefox browser to version 150.0.2 or later, or if you are using Firefox ESR, update to ESR 140.10.2 or ESR 115.35.2 or later.

Impact Analysis

CVE-2026-8090 is a use-after-free vulnerability in the DOM: Networking component of Firefox. Such vulnerabilities can lead to memory corruption, which attackers might exploit to execute arbitrary code on the affected system.

This means that if exploited, an attacker could potentially take control of your browser or system, leading to unauthorized actions or data compromise.

The issue was fixed in Firefox versions 150.0.2, Firefox ESR 140.10.2, and Firefox ESR 115.35.2, so using these or later versions mitigates the risk.

Compliance Impact

The provided information does not specify how CVE-2026-8090 affects compliance with common standards and regulations such as GDPR or HIPAA.

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