Quick answers
- Is CVE-2026-83655 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-83655 being exploited in the wild.
- How severe is CVE-2026-83655?
- High severity, with a CVSS score of 7.5, published 13 October 2026.
- Which products and versions are affected?
- Microsoft Network Policy Server.
- Is there a fix for CVE-2026-83655?
- 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-2026-83655 attacked?
- It is attacked over the network, in a hosted service.
- Am I affected by CVE-2026-83655?
- Check whether you run Microsoft Network Policy 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 out-of-bounds read in Network Policy Server results in a denial-of-service condition when triggered by a specially crafted network request. The vulnerability is remotely exploitable over the network without authentication, allowing unauthenticated attackers to trigger the memory access violation and crash the affected service.
Affected products
- Microsoft Network Policy Server
Timeline
- 2026-10-13: disclosed