---
title: "CVE-2026-92022: Mozilla Firefox - Use After Free"
description: "Mozilla Firefox contains a use-after-free vulnerability caused by improper memory handling in the DOM HTML Parser component, letting attackers cause memory corruption or remote code execution, exploit requires crafted web content."
url: https://panop.io/threat-heartbeat/CVE-2026-92022/
---

# CVE-2026-92022 Mozilla Firefox - Use After Free

Mozilla Firefox contains a use-after-free vulnerability caused by improper memory handling in the DOM HTML Parser component, letting attackers cause memory corruption or remote code execution, exploit requires crafted web content.

CVSS base score 8.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.32% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-92022)

## Details

Type

Use After Free

Impact

Remote Code Execution

CVSS vector

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

Published

15 September 2026

Updated

15 October 2026

Weakness

[CWE-416](https://cwe.mitre.org/data/definitions/416.html)

## Vendor fix

Update to Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, 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-2026-92022](https://nvd.nist.gov/vuln/detail/CVE-2026-92022)
- [https://www.mozilla.org/security/advisories/mfsa2026-95/](https://www.mozilla.org/security/advisories/mfsa2026-95/)
- [https://www.mozilla.org/security/advisories/mfsa2026-96/](https://www.mozilla.org/security/advisories/mfsa2026-96/)
- [https://bugzilla.mozilla.org/show\_bug.cgi?id=2068059](https://bugzilla.mozilla.org/show_bug.cgi?id=2068059)
- [https://www.mozilla.org/security/advisories/mfsa2026-90/](https://www.mozilla.org/security/advisories/mfsa2026-90/)
- [https://www.mozilla.org/security/advisories/mfsa2026-91/](https://www.mozilla.org/security/advisories/mfsa2026-91/)
- [https://www.mozilla.org/security/advisories/mfsa2026-92/](https://www.mozilla.org/security/advisories/mfsa2026-92/)
- [https://www.mozilla.org/security/advisories/mfsa2026-93/](https://www.mozilla.org/security/advisories/mfsa2026-93/)
- [https://www.mozilla.org/security/advisories/mfsa2026-94/](https://www.mozilla.org/security/advisories/mfsa2026-94/)

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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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