# CVE-2026-69266: Microsoft Windows DHCP Server integer overflow

Source: https://junglewise.ai/threats/cve-2026-69266-microsoft-windows-dhcp-server-integer-overflow  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-08. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-69266 · Severity: high · CVSS 8.8 · Published 2026-09-08

Windows DHCP Server is a networking service that automatically assigns IP addresses to devices on a corporate network. An integer overflow vulnerability allows an attacker to remotely send a specially crafted network packet that causes the service to crash or execute malicious code, potentially compromising server availability and enabling lateral movement within the network.

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

## Quick answers

**Is CVE-2026-69266 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-69266 being exploited in the wild.

**How severe is CVE-2026-69266?** High severity, with a CVSS score of 8.8, published 8 September 2026.

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

**Is there a fix for CVE-2026-69266?** 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-2026-69266 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-69266?** Check whether you run Microsoft Windows DHCP 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

An integer overflow or wraparound vulnerability exists in Windows DHCP Server's packet handling logic. The vulnerability is triggered by a network-reachable attacker sending a malformed DHCP protocol message that causes an integer calculation to overflow. No authentication is required; exploitation occurs at the network boundary. A successful exploit results in remote code execution with DHCP Server privileges, typically SYSTEM-level access on Windows servers. Patches are available from Microsoft via the Security Update Guide.

## Affected products

- Microsoft Windows DHCP Server

## Timeline

- 2026-09-08: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69266](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69266)

## Related threats

- [Microsoft Windows DHCP Server uncontrolled resource consumption](https://junglewise.ai/threats/cve-2026-96134-uncontrolled-resource-consumption-in-windows-dhcp-server-allows)
- [Windows DHCP Server time-of-check time-of-use race condition](https://junglewise.ai/threats/cve-2026-88216-time-of-check-time-of-use-toctou-race-condition-in-windows-dhcp)
- [Microsoft Windows DHCP Server use-after-free remote code execution](https://junglewise.ai/threats/cve-2026-72998-use-after-free-in-windows-dhcp-server-allows-an-unauthorized)
- [Windows DHCP Server out-of-bounds read](https://junglewise.ai/threats/cve-2026-119890-out-of-bounds-read-in-windows-dhcp-server-allows-an-authorized)
- [Microsoft Windows DHCP Server improper access control](https://junglewise.ai/threats/cve-2026-113773-improper-access-control-in-windows-dhcp-server-allows-an)