# CVE-2026-85897: Microsoft Edge heap-based buffer overflow

Source: https://junglewise.ai/threats/cve-2026-85897-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-2026-85897 · Severity: high · CVSS 8.8 · Published 2026-10-29

Microsoft Edge is a web browser used to access websites and online services. A heap-based buffer overflow vulnerability allows an attacker to execute malicious code on a user's computer by crafting a malicious web page, potentially leading to complete system compromise or data theft.

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

## Quick answers

**Is CVE-2026-85897 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-85897 being exploited in the wild.

**How severe is CVE-2026-85897?** 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-2026-85897?** 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-2026-85897 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-85897?** 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), allowing remote code execution via network attack vector. The vulnerability requires no user authentication or special preconditions beyond visiting a malicious website, giving attackers the ability to execute arbitrary code with the privileges of the browser process.

## Affected products

- Microsoft Edge

## Timeline

- 2026-10-29: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85897](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85897)

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