---
id: CVE-2026-56645
title: >-
  Heap-based buffer overflow in Microsoft Edge (Chromium-based) allows an
  unauthorized attacker to execute code over a network.
summary: >-
  Heap-based buffer overflow in Microsoft Edge (Chromium-based) allows an
  unauthorized attacker to execute code over a network.
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'
cwe:
  - CWE-122
published: '2026-07-03'
updated: '2026-07-03'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-56645'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56645'
    label: secure@microsoft.com
tags:
  - nvd
  - cve.org
epss: 0.00819
epssPercentile: 0.55488
ingestedAt: '2026-07-04T16:56:19.084Z'
vendor: Microsoft
product: Microsoft Edge (Chromium-based)
affected:
  - edge_chromium-based >= 1.0.0.0 < 150.0.4078.48
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-07-06T00:00:00+00:00'
---

## Overview

Heap-based buffer overflow in Microsoft Edge (Chromium-based) allows an unauthorized attacker to execute code over a network.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.