CVE-2026-33599

Out-of-bounds read in service discovery

CVSS 3.1 LOWEPSS 0.3%CWE-125

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.

CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

Affected products

PowerDNS · DNSdist

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References

https://www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2026-04.html