# CVE-2023-26437: pdns-recursor: Denial of service vulnerability in PowerDNS Recursor allows authoritative servers to be marked unavailable.This issue...

CVE-2023-26437 is fixed in pdns-recursor on 1 platform, first by DEBIAN-CVE-2023-26437, released April 4, 2023. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2023-26437
- Priority: Routine
- CVSS: 5.3 (medium)
- EPSS: 0.0059
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 4, 2023

## Description

Denial of service vulnerability in PowerDNS Recursor allows authoritative servers to be marked unavailable.This issue affects Recursor: through 4.6.5, through 4.7.4 , through 4.8.3.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | pdns-recursor Debian 12.15 (bookworm) | 4.8.4-1 | [DEBIAN-CVE-2023-26437](https://patchblox.com/security/data/fix/linux/debian-cve-2023-26437.md) | Apr 4, 2023 |
| Linux | pdns-recursor Debian 13.5 (trixie) | 4.8.4-1 | [DEBIAN-CVE-2023-26437](https://patchblox.com/security/data/fix/linux/debian-cve-2023-26437.md) | Apr 4, 2023 |
| Linux | pdns-recursor Debian 14 | 4.8.4-1 | [DEBIAN-CVE-2023-26437](https://patchblox.com/security/data/fix/linux/debian-cve-2023-26437.md) | Apr 4, 2023 |

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Data as of 2026-11-08T06:59:42Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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