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