---
id: "CVE-2026-96198"
kind: "vulnerability"
aliases: ["CVE-2026-96198"]
title: "Microsoft Edge: heap buffer overflow lets a remote attacker run code"
severity: "high"
cvss: 8.8
epss: null
exploited: false
status: "open"
category: "other"
products: [{"name": "Microsoft Edge (Chromium-based)", "fixed": ["154.0.4258.37"], "affected": "< 154.0.4258.37", "ecosystem": "vendor"}]
ecosystems: []
tags: ["chromium", "macos", "microsoft-edge", "other", "windows"]
not_affected_if: ["patched-edge"]
published_at: "2026-10-29T16:20:08+00:00"
first_seen_at: "2026-10-29T16:26:03+00:00"
updated_at: "2026-10-29T16:33:33+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-96198", "first_seen_at": "2026-10-29T16:26:03+00:00"}, {"source": "analyst", "url": null, "first_seen_at": "2026-10-29T16:33:33+00:00"}]
---

# Microsoft Edge: heap buffer overflow lets a remote attacker run code

A heap-based buffer overflow in Chromium-based Microsoft Edge lets an unauthorized attacker run code over the network. The sources give no further detail on the trigger or affected versions.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:Microsoft Edge (Chromium-based) affected < 154.0.4258.37 fixed 154.0.4258.37

## How to check

Open edge://settings/help or edge://version. If the version is below 154.0.4258.37, you are exposed. Update and restart Edge.

## Fix

Update Microsoft Edge (Chromium-based) to 154.0.4258.37 or later (edge://settings/help).

## Timeline

- 2026-10-29T16:26:03+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-96198
- 2026-10-29T16:33:33+00:00 analyst — MSRC page read: heap overflow CWE-122, fixed in Edge 154.0.4258.37 (released Oct 16, table added Oct 26), not exploited, not publicly disclosed, 'Exploitation Less Likely'. MSRC FAQ oddly mentions a malicious Office file (likely boilerplate); Tenable lists <155.0.4283.62, which differs from MSRC; used MSRC. Edge 156.0.4314.42 stable was released Oct 22.

## Documents

- [advisory] MSRC: CVE-2026-96198 Microsoft Edge (Chromium-based) RCE https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-96198

## From the sources

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

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_