Quick answers
- Is CVE-2026-85859 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-85859 being exploited in the wild.
- How severe is CVE-2026-85859?
- Medium severity, with a CVSS score of 6.5, published 13 October 2026.
- Which products and versions are affected?
- Microsoft Windows Message Queuing <UNKNOWN>.
- Is there a fix for CVE-2026-85859?
- 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-2026-85859 attacked?
- It is attacked over the network, in an operating system.
- Am I affected by CVE-2026-85859?
- Check whether you run Microsoft Windows Message Queuing 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 null pointer dereference in the Windows Message Queuing Queue Manager can be triggered by an authorized attacker over the network. The vulnerability allows an attacker with valid credentials to send a specially crafted message that causes the service to crash, resulting in denial of service. This requires authentication and network access to trigger.
Affected products
- Microsoft Windows Message Queuing <UNKNOWN>
Timeline
- 2026-10-13: disclosed