Quick answers
- Is CVE-2026-69858 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-69858 being exploited in the wild.
- How severe is CVE-2026-69858?
- High severity, with a CVSS score of 8.1, published 8 September 2026.
- Which products and versions are affected?
- Microsoft Windows DNS Server.
- Is there a fix for CVE-2026-69858?
- 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-2026-69858 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-69858?
- Check whether you run Microsoft Windows DNS Server, Microsoft Windows Server 2022 or Microsoft Windows Server 2025. 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 the Windows DNS Server component, where freed memory is accessed after deallocation, potentially allowing arbitrary code execution. The vulnerability is remotely exploitable over the network without requiring authentication or user interaction. An unauthenticated attacker can send specially crafted DNS protocol packets to trigger the flaw and execute code with DNS Server privileges. No public exploits are currently known to be in active use, though the high CVSS score (8.1) reflects the severity of the exposure.
Affected products
- Microsoft Windows DNS Server
Timeline
- 2026-09-08: disclosed