# CVE-2026-69359: Microsoft Active Directory Domain Services heap buffer overflow

Source: https://junglewise.ai/threats/cve-2026-69359-microsoft-active-directory-domain-services-heap-buffer-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-2026-69359 · Severity: high · CVSS 7.8 · Published 2026-09-08

Active Directory Domain Services is the core directory service used by Windows networks to manage user accounts, computers, and security policies. A heap buffer overflow vulnerability allows a user with local authentication to escalate their privileges on an affected domain controller, potentially granting administrative access to the entire network infrastructure.

Technologies: [Microsoft Active Directory Domain Services](https://junglewise.ai/threats/technologies/active-directory-domain-services). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-69359 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-69359 being exploited in the wild.

**How severe is CVE-2026-69359?** High severity, with a CVSS score of 7.8, published 8 September 2026.

**Which products and versions are affected?** Microsoft Active Directory Domain Services <UNKNOWN>.

**Is there a fix for CVE-2026-69359?** 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-2026-69359 attacked?** It is attacked with local access.

**Am I affected by CVE-2026-69359?** Check whether you run Microsoft Active Directory Domain Services at an affected version. 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 heap-based buffer overflow exists in Active Directory Domain Services that can be triggered by an authenticated local attacker. The vulnerability allows an attacker with valid credentials on a domain controller to overflow a heap buffer, leading to memory corruption and privilege escalation to SYSTEM or higher privileges. This is a local attack vector requiring prior authentication or local system access. The attacker must already have credentials or local access to execute the vulnerability; network-based exploitation from unauthenticated remote users is not possible. Microsoft has issued security updates to address this vulnerability.

## Affected products

- Microsoft Active Directory Domain Services <UNKNOWN>

## Timeline

- 2026-09-08: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69359](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69359)

## Related threats

- [Microsoft Active Directory Domain Services authentication bypass](https://junglewise.ai/threats/cve-2026-118735-weak-authentication-in-active-directory-domain-services-allows)
- [Microsoft Active Directory Domain Services privilege elevation](https://junglewise.ai/threats/cve-2026-118148-improper-authentication-in-active-directory-domain-services)
- [Microsoft Active Directory Domain Services authorization bypass](https://junglewise.ai/threats/cve-2026-118146-incorrect-authorization-in-active-directory-domain-services)
- [Microsoft Active Directory Domain Services out-of-bounds read](https://junglewise.ai/threats/cve-2026-105568-out-of-bounds-read-in-active-directory-domain-services-allows-an)
- [Microsoft Active Directory Domain Services out-of-bounds write](https://junglewise.ai/threats/cve-2026-88165-out-of-bounds-write-in-active-directory-domain-services-allows-an)