Charles Howes

**Name of the Vulnerable Software and Affected Versions** DNSdist versions prior to 1.9.9 **Description** When DNSdist is configured to provide DoH via the nghttp2 provider, an attacker can cause a denial of service by crafting a DoH exchange that triggers an illegal memory access (double-free) and crash of DNSdist, causing a denial of service. **Recommendations** To resolve the issue, upgrade to the patched 1.9.9 version. As a temporary workaround, consider switching to the h2o provider until DNSdist has been upgraded to a fixed version.