CVE-2026-92042

Received Received - Intake

DOM Content Process Race Condition in Firefox

Publication date: 2026-09-15

Last updated on: 2026-10-05

Assigner: Mozilla Corporation

Description

Race condition in the DOM: Content Processes component. This vulnerability was fixed in Firefox 156, Firefox ESR 153.3, and Thunderbird 156.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-09-15

Last Modified

2026-10-05

Generated

2026-10-05

AI Q&A

2026-09-15

EPSS Evaluated

2026-10-04

NVD

CVE-2026-92042

EUVD

EUVD-2026-78505

Affected Vendors & Products

Vendor	Product	Version / Range
mozilla	thunderbird	From 154.0 (inc) to 156.0 (exc)
mozilla	firefox	to 153.3.0 (exc)
mozilla	firefox	From 154.0.0 (inc) to 156.0.0 (exc)
mozilla	thunderbird	to 153.3.0 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-362	The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.

Attack-Flow Graph

Executive Summary

This is a race condition vulnerability in Firefox's DOM Content Processes component. A race condition occurs when the behavior of software depends on the sequence or timing of uncontrollable events, potentially leading to unexpected results. It was fixed in Firefox version 156 and Firefox ESR version 153.3.

Detection Guidance

This vulnerability is a race condition in Firefox's DOM Content Processes component, fixed in Firefox 156, Firefox ESR 153.3, and Thunderbird 156. Detection requires checking installed versions of these applications against the patched versions.

Impact Analysis

A race condition could allow attackers to manipulate the browser's behavior, potentially leading to crashes, data corruption, or unauthorized access to sensitive information. Users running vulnerable versions should update Firefox immediately.

Mitigation Strategies

Update Firefox to version 156 or later and Firefox ESR to version 153.3 or later to address the race condition in the DOM Content Processes component.

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