dnsdist: An attacker can create a large number of concurrent DoQ or DoH3 connections, causing unlimited memory allocation in D...
CVE-2026-33254 is fixed in dnsdist on 1 platform, first by DEBIAN-CVE-2026-33254, released May 15, 2026. It is not reported as exploited. Patch Radar priority: High.
An attacker can create a large number of concurrent DoQ or DoH3 connections, causing unlimited memory allocation in DNSdist and leading to a denial of service. DOQ and DoH3 are disabled by default.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| dnsdist · Debian 13.5 (trixie) | 1.9.14-0+deb13u1 | DEBIAN-CVE-2026-33254 | May 15, 2026 |
| dnsdist · Debian 14 | 2.0.4-1 | DEBIAN-CVE-2026-33254 | May 15, 2026 |
| dnsdist · opensuse-leap 16.0 | 1.9.13-160000.1.1 | OPENSUSE-SU-2026:21015-1 | Jun 22, 2026 |
| dnsdist · sles 16.0 | 1.9.13-160000.1.1 | SUSE-SU-2026:22319-1 | Jun 22, 2026 |
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