# CVE-2025-30194: dnsdist: When DNSdist is configured to provide DoH via the nghttp2 provider, an attacker can cause a denial of service by craf...

CVE-2025-30194 is fixed in dnsdist on 1 platform, first by DEBIAN-CVE-2025-30194, released April 29, 2025. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2025-30194
- Priority: High
- CVSS: 7.5 (high)
- EPSS: 0.0229
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 29, 2025

## 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.  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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | dnsdist Debian 13.5 (trixie) | 1.9.9-1 | [DEBIAN-CVE-2025-30194](https://patchblox.com/security/data/fix/linux/debian-cve-2025-30194.md) | Apr 29, 2025 |
| Linux | dnsdist Debian 14 | 1.9.9-1 | [DEBIAN-CVE-2025-30194](https://patchblox.com/security/data/fix/linux/debian-cve-2025-30194.md) | Apr 29, 2025 |
| Linux | dnsdist sles 15.7 | 1.9.10-150700.3.3.1 | [SUSE-SU-2025:01743-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-01743-1.md) | May 29, 2025 |

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Data as of 2026-11-09T01:18:40Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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