# CVE-2026-109463: Microsoft Windows DNS deserialization code execution

Source: https://junglewise.ai/threats/cve-2026-109463-deserialization-of-untrusted-data-in-windows-dns-allows-an  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-10. Updated: 2026-11-10  
License: CC BY 4.0 with a link back

CVE-2026-109463 · Severity: high · CVSS 8.8 · Published 2026-11-10

Windows DNS, a critical networking service used by organizations to resolve domain names, contains a flaw that allows attackers to execute arbitrary code remotely without authentication. An attacker on the network can exploit this vulnerability to gain complete control of an affected system.

Technologies: [Microsoft Windows DNS](https://junglewise.ai/threats/technologies/windows-dns). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-109463 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-109463 being exploited in the wild.

**How severe is CVE-2026-109463?** High severity, with a CVSS score of 8.8, published 10 November 2026.

**Which products and versions are affected?** Microsoft Windows DNS.

**Is there a fix for CVE-2026-109463?** 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-2026-109463 attacked?** It is attacked over the network, in an operating system.

**Am I affected by CVE-2026-109463?** Check whether you run Microsoft Windows DNS. 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

Deserialization of untrusted data in Windows DNS service allows remote code execution without requiring authentication or user interaction. The vulnerability exists in DNS protocol handling and can be exploited over the network to execute arbitrary code with system privileges.

## Affected products

- Microsoft Windows DNS

## Timeline

- 2026-11-10: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-109463](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-109463)

## Related threats

- [Microsoft Windows DNS out-of-bounds read information disclosure](https://junglewise.ai/threats/cve-2026-96988-out-of-bounds-read-in-windows-dns-allows-an-authorized-attacker)
- [Windows DNS out-of-bounds read information disclosure](https://junglewise.ai/threats/cve-2026-96987-out-of-bounds-read-in-windows-dns-allows-an-authorized-attacker)
- [Windows DNS out-of-bounds read information disclosure](https://junglewise.ai/threats/cve-2026-96986-out-of-bounds-read-in-windows-dns-allows-an-authorized-attacker)
- [Windows DNS out-of-bounds read information disclosure](https://junglewise.ai/threats/cve-2026-96985-out-of-bounds-read-in-windows-dns-allows-an-authorized-attacker)
- [Windows DNS out-of-bounds read information disclosure](https://junglewise.ai/threats/cve-2026-96980-out-of-bounds-read-in-windows-dns-allows-an-authorized-attacker)