# CVE-2026-88122: Microsoft DNS Server out-of-bounds read denial of service

Source: https://junglewise.ai/threats/cve-2026-88122-out-of-bounds-read-in-dns-server-allows-an-authorized-attacker-to  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-13. Updated: 2026-10-16  
License: CC BY 4.0 with a link back

CVE-2026-88122 · Severity: medium · CVSS 6.5 · Published 2026-10-13

An out-of-bounds read vulnerability in Microsoft DNS Server allows an authenticated attacker to cause a denial of service over the network. An attacker with network access and valid credentials could craft a malicious DNS request to crash the DNS service, disrupting domain name resolution for affected organizations.

Technologies: [Microsoft DNS Server](https://junglewise.ai/threats/technologies/microsoft-dns-server), [Microsoft Windows Server 2012](https://junglewise.ai/threats/technologies/windows-server-2012), [Microsoft Windows Server 2016](https://junglewise.ai/threats/technologies/windows-server-2016), [Microsoft Windows Server 2019](https://junglewise.ai/threats/technologies/windows-server-2019), [Microsoft Windows Server 2022](https://junglewise.ai/threats/technologies/windows-server-2022), [Microsoft Windows Server 2025](https://junglewise.ai/threats/technologies/windows-server-2025). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-88122 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-88122 being exploited in the wild.

**How severe is CVE-2026-88122?** Medium severity, with a CVSS score of 6.5, published 13 October 2026.

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

**Is there a fix for CVE-2026-88122?** 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-2026-88122 attacked?** It is attacked over the network, in a hosted service.

**Am I affected by CVE-2026-88122?** Check whether you run Microsoft DNS Server, Microsoft Windows Server 2012, Microsoft Windows Server 2016 or one of the others listed. 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

An out-of-bounds read vulnerability exists in Microsoft DNS Server's DNS request processing logic. An authenticated attacker with network access can send a specially crafted DNS packet that triggers the out-of-bounds read, causing the DNS service to crash and deny service. The vulnerability requires authentication and network access but does not allow code execution or data extraction.

## Affected products

- Microsoft DNS Server

## Timeline

- 2026-10-13: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-88122](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-88122)

## Related threats

- [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)
- [Windows DNS Server out-of-bounds read information disclosure](https://junglewise.ai/threats/cve-2026-97843-out-of-bounds-read-in-dns-server-allows-an-authorized-attacker-to)
- [Windows DNS Server out-of-bounds read information disclosure](https://junglewise.ai/threats/cve-2026-97842-out-of-bounds-read-in-dns-server-allows-an-authorized-attacker-to)
- [Windows DNS Server out-of-bounds read](https://junglewise.ai/threats/cve-2026-97841-out-of-bounds-read-in-dns-server-allows-an-authorized-attacker-to)
- [DNS Server out-of-bounds read information disclosure](https://junglewise.ai/threats/cve-2026-97840-out-of-bounds-read-in-dns-server-allows-an-authorized-attacker-to)