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.

The remedy is: upgrade to the patched 1.9.9 version.

A workaround is to temporarily switch to the h2o provider until DNSdist has been upgraded to a fixed version.

We would like to thank Charles Howes for bringing this issue to our attention.

Related CVEs

CVE-2025-30194

Key Information

GHSA ID

GHSA-487w-xx5j-gqwc

Published

April 29, 2025 12:30 PM

Last Modified

June 20, 2025 9:32 PM

CVSS Score

7.5 /10

Primary Ecosystem

Unknown

Primary Package

Unknown

GitHub Reviewed

✗ No

Dataset

Last updated: July 26, 2025 6:37 AM

Data from GitHub Advisory Database. This information is provided for research and educational purposes.