CVE-2026-33254 — Denial of Service
CVE-2026-33254 — 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.
What This Means For You
- If your environment is affected by this vulnerability type, review your exposure and prioritize patching based on your environment. Monitor vendor advisories for CVE-2026-33254 updates and patches.
Related ATT&CK Techniques
🛡️ Detection Rules
3 rules · 6 SIEM formats3 detection rules auto-generated for this incident, mapped to MITRE ATT&CK. Sigma YAML is free — export to any SIEM format via the Intel Bot.
Excessive Concurrent DoQ/DoH3 Connections to DNSdist — CVE-2026-33254
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-33254 | vulnerability | CVE-2026-33254 |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | April 22, 2026 at 17:16 UTC |
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