---
title: "CVE-2026-92076: Mozilla Firefox - Buffer Overflow"
description: "Mozilla Firefox < 156 and Firefox ESR < 153.3 contain a buffer overflow caused by incorrect boundary conditions in the Networking component, letting attackers potentially cause memory corruption, exploit requires crafted network input."
url: https://panop.io/threat-heartbeat/CVE-2026-92076/
---

# CVE-2026-92076 Mozilla Firefox - Buffer Overflow

Mozilla Firefox < 156 and Firefox ESR < 153.3 contain a buffer overflow caused by incorrect boundary conditions in the Networking component, letting attackers potentially cause memory corruption, exploit requires crafted network input.

CVSS base score 8.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.11% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-92076)

## Details

Type

Buffer Overflow

Impact

Buffer Overflow

CVSS vector

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

Published

15 September 2026

Updated

15 October 2026

Weakness

[CWE-119](https://cwe.mitre.org/data/definitions/119.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-2026-92076](https://nvd.nist.gov/vuln/detail/CVE-2026-92076)
- [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=2064026](https://bugzilla.mozilla.org/show_bug.cgi?id=2064026)
- [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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