In some circumstances, when DNSdist is configured to use the nghttp2 library to process incoming DNS over HTTPS queries, an attacker might be able to cause a denial of service by crafting a DoH exchange that triggers an unbounded I/O read loop, causing an unexpected consumption of CPU resources.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade dnsdist | Dec 5, 2025 | Sep 18, 2025 |
| Debian | — | Upgrade dnsdist | Jul 23, 2026 | Jul 23, 2026 |
| Freebsd | — | Upgrade dnsdist | Dec 10, 2025 | Sep 24, 2025 |
| Ubuntu | — | Upgrade dnsdist (Ubuntu Pro)Upgrade dnsdist | Feb 13, 2026 | Sep 18, 2025 |
With curated Threat Intelligence, you can see which vulnerabilities truly put you at risk, prioritize what matters most, and act before attackers do.
Explore Intelligence Hub