---
title: "CVE-2026-92042: Mozilla Firefox - Race Condition"
description: "Mozilla Firefox < 156 and Firefox ESR < 153.3 contain a race condition in the DOM Content Processes component, letting attackers cause potential denial of service or unexpected behavior, exploit requires no special conditions."
url: https://panop.io/threat-heartbeat/CVE-2026-92042/
---

# CVE-2026-92042 Mozilla Firefox - Race Condition

Mozilla Firefox < 156 and Firefox ESR < 153.3 contain a race condition in the DOM Content Processes component, letting attackers cause potential denial of service or unexpected behavior, exploit requires no special conditions.

CVSS base score 7.5 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.22% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-92042)

## Details

Type

Race Condition

Impact

Denial Of Service

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Published

15 September 2026

Updated

15 October 2026

Weakness

[CWE-362](https://cwe.mitre.org/data/definitions/362.html)

## Vendor fix

Update to Firefox 156 and Firefox ESR 153.3 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-92042](https://nvd.nist.gov/vuln/detail/CVE-2026-92042)
- [https://www.mozilla.org/security/advisories/mfsa2026-94/](https://www.mozilla.org/security/advisories/mfsa2026-94/)
- [https://www.mozilla.org/security/advisories/mfsa2026-96/](https://www.mozilla.org/security/advisories/mfsa2026-96/)
- [https://bugzilla.mozilla.org/show\_bug.cgi?id=2049342](https://bugzilla.mozilla.org/show_bug.cgi?id=2049342)
- [https://www.mozilla.org/security/advisories/mfsa2026-90/](https://www.mozilla.org/security/advisories/mfsa2026-90/)
- [https://www.mozilla.org/security/advisories/mfsa2026-93/](https://www.mozilla.org/security/advisories/mfsa2026-93/)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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