Quick answers
- Is CVE-2026-85319 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-85319 being exploited in the wild.
- How severe is CVE-2026-85319?
- High severity, with a CVSS score of 7.5, published 13 October 2026.
- Which products and versions are affected?
- Microsoft Active Directory Federation Services.
- Is there a fix for CVE-2026-85319?
- 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-2026-85319 attacked?
- It is attacked over the network, in a hosted service.
- Am I affected by CVE-2026-85319?
- Check whether you run Microsoft Active Directory Federation Services, Microsoft Windows 10 1607, Microsoft Windows 10 1809 or one of the others listed. 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
This vulnerability exists in AD FS due to missing resource limits or throttling, enabling a network-based denial-of-service attack from an unauthenticated attacker. The service lacks controls to prevent unbounded resource allocation in response to requests, allowing an attacker to exhaust memory, CPU, or connection pools and crash or hang the service.
Affected products
- Microsoft Active Directory Federation Services
Timeline
- 2026-10-13: disclosed