# CVE-2025-30187: dnsdist: In some circumstances, when DNSdist is configured to use the nghttp2 library to process incoming DNS over HTTPS queri...

CVE-2025-30187 is fixed in dnsdist on 1 platform, first by dnsdist 1.9.10-1ubuntu0.1, released September 18, 2025. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2025-30187
- Priority: Routine
- CVSS: 3.7 (low)
- EPSS: 0.0030
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 18, 2025

## Description

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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | dnsdist Debian 13.5 (trixie) | 1.9.10-1+deb13u1 | [DEBIAN-CVE-2025-30187](https://patchblox.com/security/data/fix/linux/debian-cve-2025-30187.md) | Sep 18, 2025 |
| Linux | dnsdist Debian 14 | 2.0.1-1 | [DEBIAN-CVE-2025-30187](https://patchblox.com/security/data/fix/linux/debian-cve-2025-30187.md) | Sep 18, 2025 |
| Linux | dnsdist Ubuntu 25.10 (questing) | 1.9.10-1ubuntu0.1 | [dnsdist 1.9.10-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-questing-dnsdist-1.9.10-1ubuntu0.1.md) | Sep 18, 2025 |
| Linux | dnsdist opensuse-leap 16.0 | 1.9.11-160000.1.1 | [OPENSUSE-SU-2026:20461-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20461-1.md) | Apr 2, 2026 |
| Linux | dnsdist sles 15.7 | 1.9.11-150700.3.6.1 | [SUSE-SU-2026:0888-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0888-1.md) | Mar 13, 2026 |
| Linux | dnsdist sles 16.0 | 1.9.11-160000.1.1 | [SUSE-SU-2026:20995-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-20995-1.md) | Apr 2, 2026 |

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Data as of 2026-11-08T13:06:02Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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