# CVE-2026-96198: Microsoft Edge heap-based buffer overflow

Source: https://junglewise.ai/threats/cve-2026-96198-heap-based-buffer-overflow-in-microsoft-edge-chromium-based  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-29. Updated: 2026-10-29  
License: CC BY 4.0 with a link back

CVE-2026-96198 · Severity: high · CVSS 8.8 · Published 2026-10-29

Microsoft Edge is a web browser used by millions of users to access websites and online services. A heap buffer overflow vulnerability in Edge allows an attacker to run malicious code on a user's computer through a specially crafted webpage, potentially leading to data theft, malware infection, or system compromise.

Technologies: [Microsoft Edge](https://junglewise.ai/threats/technologies/edge). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-96198 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-96198 being exploited in the wild.

**How severe is CVE-2026-96198?** High severity, with a CVSS score of 8.8, published 29 October 2026.

**Which products and versions are affected?** Microsoft Edge.

**Is there a fix for CVE-2026-96198?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-96198 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-96198?** Check whether you run Microsoft Edge. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A heap-based buffer overflow exists in Microsoft Edge (Chromium-based) that can be triggered remotely without authentication. An attacker can craft a malicious webpage that exploits this vulnerability to achieve arbitrary code execution in the context of the browser process. This is a memory safety issue in the rendering or JavaScript engine allowing out-of-bounds write access.

## Affected products

- Microsoft Edge

## Timeline

- 2026-10-29: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-96198](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-96198)

## Related threats

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- [Microsoft Edge use-after-free privilege elevation](https://junglewise.ai/threats/cve-2026-96203-use-after-free-in-microsoft-edge-chromium-based-allows-an)
- [Microsoft Edge heap-based buffer overflow](https://junglewise.ai/threats/cve-2026-96199-heap-based-buffer-overflow-in-microsoft-edge-chromium-based)
- [Microsoft Edge incomplete input validation bypass](https://junglewise.ai/threats/cve-2026-96196-incomplete-list-of-disallowed-inputs-in-microsoft-edge-chromium)