# CVE-2026-119905: Microsoft Windows DNS Server improper input validation spoofing

Source: https://junglewise.ai/threats/cve-2026-119905-improper-input-validation-in-windows-dns-allows-an-authorized  
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-2026-119905 · Severity: medium · CVSS 4.9 · Published 2026-11-10

Windows DNS Server is the service responsible for translating domain names to IP addresses on Windows networks. An authenticated attacker can exploit improper input validation to spoof DNS responses, redirecting users to malicious websites or intercepting their network traffic. This could lead to credential theft, malware distribution, or unauthorized network access.

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

## Quick answers

**Is CVE-2026-119905 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-119905 being exploited in the wild.

**How severe is CVE-2026-119905?** Medium severity, with a CVSS score of 4.9, published 10 November 2026.

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

**Is there a fix for CVE-2026-119905?** 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-2026-119905 attacked?** It is attacked over the network, in an operating system.

**Am I affected by CVE-2026-119905?** Check whether you run Microsoft Windows DNS Server. 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

The vulnerability stems from improper input validation in Windows DNS Server that allows an authorized attacker to craft malicious DNS requests resulting in spoofed DNS responses. The attack requires network access and prior authentication or authorization; an attacker with such access can manipulate DNS responses to redirect traffic. This is a network-based attack that could result in DNS hijacking or man-in-the-middle scenarios within an authenticated context.

## Affected products

- Microsoft Windows DNS Server

## Timeline

- 2026-11-10: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-119905](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-119905)

## Related threats

- [Microsoft Windows DNS out-of-bounds read](https://junglewise.ai/threats/cve-2026-97006-out-of-bounds-read-in-windows-dns-allows-an-authorized-attacker)
- [Windows DNS Server use-after-free remote code execution](https://junglewise.ai/threats/cve-2026-96177-use-after-free-in-dns-server-allows-an-unauthorized-attacker-to)
- [Microsoft Windows DNS Server use-after-free denial of service](https://junglewise.ai/threats/cve-2026-96017-use-after-free-in-dns-server-allows-an-authorized-attacker-to)
- [Windows DNS integer overflow in message parsing](https://junglewise.ai/threats/cve-2026-105579-integer-overflow-or-wraparound-in-windows-dns-allows-an)
- [Windows DNS Server out-of-bounds read](https://junglewise.ai/threats/cve-2026-97844-out-of-bounds-read-in-dns-server-allows-an-authorized-attacker-to)