# CVE-2026-85890: Microsoft Edge double free vulnerability allows code execution

Source: https://junglewise.ai/threats/cve-2026-85890-double-free-in-microsoft-edge-chromium-based-allows-an  
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-2026-85890 · Severity: high · CVSS 8.8 · Published 2026-10-29

Microsoft Edge is a web browser used by millions to access online services and content. A double free vulnerability in the browser's memory management allows attackers to execute arbitrary code on users' systems through malicious websites, potentially leading to 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-2026-85890 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-85890 being exploited in the wild.

**How severe is CVE-2026-85890?** 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-2026-85890?** 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-2026-85890 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-85890?** 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 double free vulnerability in Microsoft Edge's memory management allows remote code execution via network attack. The vulnerability can be exploited by serving malicious content to a user who visits an attacker-controlled or compromised website, without requiring the user to be authenticated. Successful exploitation grants the attacker code execution privileges within the browser process.

## Affected products

- Microsoft Edge

## Timeline

- 2026-10-29: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85890](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85890)

## 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-2026-96199-heap-based-buffer-overflow-in-microsoft-edge-chromium-based)
- [Microsoft Edge heap-based buffer overflow](https://junglewise.ai/threats/cve-2026-96198-heap-based-buffer-overflow-in-microsoft-edge-chromium-based)