What’s Vulnerable › Vulnerabilities
CVE-2026-33599: Out-of-bounds read in service discovery
- Severity: high (CVSS 8.1 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: 2026-04-22 · updated 2026-10-26
- Weakness: CWE-125
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.
Affected products
- PowerDNS DNSdist: from 1.9.0 before 1.9.13; from 2.0.0 before 2.0.4 — fixed in 1.9.13, 2.0.4
How to fix
Upgrade to a fixed version: PowerDNS DNSdist 1.9.13, 2.0.4. Check the vendor advisory for mitigations.
References
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