Out-of-bounds read in service discovery (CVE-2026-33599)

Summary

Out-of-bounds read in service discovery

Original description

The description as published by the source.

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.

Source: OSV.dev (Open Source Vulnerabilities) NVD OSV

Fix status by distribution

Fixed packages published by each distribution for this CVE

Debian DEBIAN-CVE-2026-33599 dnsdist
Ubuntu UBUNTU-CVE-2026-33599 dnsdist

References

advisory github.com
advisory nvd.nist.gov
advisory dnsdist.org
package github.com
web repo.powerdns.com