# CVE-2026-33599: dnsdist: A rogue backend can send a crafted SVCB response to a Discovery of Designated Resolvers request, when requested via e...

CVE-2026-33599 is fixed in dnsdist on 1 platform, first by DEBIAN-CVE-2026-33599, released May 15, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-33599
- Priority: High
- CVSS: 8.1 (high)
- EPSS: 0.0028
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 22, 2026

## Description

A rogue backend can send a crafted SVCB response to a Discovery of Designated Resolvers request, when requested via either the autoUpgrade (Lua) option to newServer or auto_upgrade (YAML) settings. DDR upgrade is not enabled by default.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | dnsdist Debian 13.5 (trixie) | 1.9.14-0+deb13u1 | [DEBIAN-CVE-2026-33599](https://patchblox.com/security/data/fix/linux/debian-cve-2026-33599.md) | May 15, 2026 |
| Linux | dnsdist Debian 14 | 2.0.4-1 | [DEBIAN-CVE-2026-33599](https://patchblox.com/security/data/fix/linux/debian-cve-2026-33599.md) | May 15, 2026 |
| Linux | dnsdist opensuse-leap 16.0 | 1.9.13-160000.1.1 | [OPENSUSE-SU-2026:21015-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21015-1.md) | Jun 22, 2026 |
| Linux | dnsdist sles 16.0 | 1.9.13-160000.1.1 | [SUSE-SU-2026:22319-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-22319-1.md) | Jun 22, 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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