# CVE-2026-83997: Microsoft Windows Message Queuing use-after-free remote code execution

Source: https://junglewise.ai/threats/cve-2026-83997-microsoft-windows-message-queuing-use-after-free-remote-code  
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-2026-83997 · Severity: high · CVSS 8.1 · Published 2026-09-08

Windows Message Queuing (MSMQ) is a core messaging service used for asynchronous communication in enterprise applications. An attacker can exploit a use-after-free vulnerability in this service to execute arbitrary code remotely without authentication, potentially compromising servers and client systems that rely on message queue functionality.

Technologies: [Microsoft Windows Message Queuing](https://junglewise.ai/threats/technologies/windows-message-queuing). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-83997 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-83997 being exploited in the wild.

**How severe is CVE-2026-83997?** High severity, with a CVSS score of 8.1, published 8 September 2026.

**Which products and versions are affected?** Microsoft Windows Message Queuing.

**Is there a fix for CVE-2026-83997?** 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-2026-83997 attacked?** It is attacked over the network, in an operating system.

**Am I affected by CVE-2026-83997?** Check whether you run Microsoft Windows Message Queuing. 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 use-after-free vulnerability exists in Windows Message Queuing, where the service incorrectly manages memory for queue objects. An attacker can send a specially crafted network request to trigger the vulnerability and execute arbitrary code with system privileges. The vulnerability is network-reachable and requires no prior authentication or user interaction. Patch availability is expected from Microsoft's Security Update Guide.

## Affected products

- Microsoft Windows Message Queuing

## Timeline

- 2026-09-08: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83997](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83997)

## Related threats

- [Windows Message Queuing use after free in Queue Manager](https://junglewise.ai/threats/cve-2026-119967-use-after-free-in-windows-message-queuing-queue-manager-allows)
- [Windows Message Queuing double free](https://junglewise.ai/threats/cve-2026-119964-double-free-in-windows-message-queuing-allows-an-unauthorized)
- [Windows Message Queuing double free remote code execution](https://junglewise.ai/threats/cve-2026-119963-double-free-in-windows-message-queuing-allows-an-unauthorized)
- [Windows Message Queuing improper input validation DoS](https://junglewise.ai/threats/cve-2026-119848-improper-input-validation-in-windows-message-queuing-allows-an)
- [Windows Message Queuing privilege escalation via untrusted pointer dereference](https://junglewise.ai/threats/cve-2026-119833-untrusted-pointer-dereference-in-windows-message-queuing-allows)