# CVE-2026-96199: Microsoft Edge heap-based buffer overflow

Source: https://junglewise.ai/threats/cve-2026-96199-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-2026-96199 · Severity: high · CVSS 8.8 · Published 2026-10-29

Microsoft Edge, a web browser used to browse the internet, contains a heap memory corruption flaw that allows an attacker to inject malicious code into the browser by sending a specially crafted network message. An exploit could lead to unauthorized code execution with the privileges of the user running the browser, potentially enabling data theft, malware installation, or system compromise.

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

## Quick answers

**Is CVE-2026-96199 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-96199 being exploited in the wild.

**How severe is CVE-2026-96199?** High severity, with a CVSS score of 8.8, published 29 October 2026.

**Which products and versions are affected?** Microsoft Edge <UNKNOWN>.

**Is there a fix for CVE-2026-96199?** 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-2026-96199 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-96199?** Check whether you run Microsoft Edge at an affected version. 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 in the Chromium-based rendering engine allows an attacker to corrupt heap memory and achieve arbitrary code execution. The vulnerability is reachable over the network through crafted web content or messages, requiring no prior authentication. An attacker can exploit this to execute arbitrary code in the context of the Edge process.

## Affected products

- Microsoft Edge <UNKNOWN>

## Timeline

- 2026-10-29: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-96199](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-96199)

## Related threats

- [Microsoft Edge out-of-bounds read information disclosure](https://junglewise.ai/threats/cve-2026-122518-out-of-bounds-read-in-microsoft-edge-chromium-based-allows-an)
- [Microsoft Edge privilege escalation via incorrect authorization](https://junglewise.ai/threats/cve-2026-69446-incorrect-authorization-in-microsoft-edge-chromium-based-allows)
- [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-2026-96198-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)