Quick answers
- Is CVE-2026-88123 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-88123 being exploited in the wild.
- How severe is CVE-2026-88123?
- Medium severity, with a CVSS score of 6.5, published 13 October 2026.
- Which products and versions are affected?
- DNS Server.
- Is there a fix for CVE-2026-88123?
- 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-2026-88123 attacked?
- It is attacked over the network, in a hosted service.
- Am I affected by CVE-2026-88123?
- Check whether you run Microsoft Windows Server 2012, Microsoft Windows Server 2016, Microsoft Windows Server 2019 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
An out-of-bounds read flaw exists in a DNS Server component that can be triggered by an authorized attacker over the network. The vulnerability allows reading memory outside allocated buffers, which can be exploited to crash the DNS service and achieve denial of service. Attack requires prior authorization or network access to the DNS service.
Affected products
- DNS Server
Timeline
- 2026-10-13: disclosed