What’s Vulnerable › Vulnerabilities

CVE-2025-59023: Crafted delegations or IP fragments can poison cached delegations in Recursor

• Severity: high (CVSS 8.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-02-09 · updated 2026-06-17
• Weakness: CWE-294

Description

Crafted delegations or IP fragments can poison cached delegations in Recursor.

Affected products

• PowerDNS Recursor: from 5.1.0 before 5.1.8; from 5.2.0 before 5.2.6; from 5.3.0 before 5.3.1 — fixed in 5.1.8, 5.2.6, 5.3.1

How to fix

Upgrade to a fixed version: PowerDNS Recursor 5.1.8, 5.2.6, 5.3.1. Check the vendor advisory for mitigations.

References

• https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-2025-06.html

Get alerted when CVE-2025-59023 or the next vulnerability affects your stack