Vulnerability · Published Apr 22, 2026 · Assigned by OX
CVE-2026-33599Out-of-bounds read in service discovery
Low 3.1
In plain English
A low-severity out-of-bounds read in DNSdist from PowerDNS. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 21% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)3.1Low
Exploit odds (30 days)0.3%top 79.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.23 | dnsdist | 2.0.4-r0 | ALPINE-CVE-2026-33599 |
| Alpine:v3.24 | dnsdist | 2.0.4-r0 | ALPINE-CVE-2026-33599 |
| Debian:12 | dnsdist | no fix listed | DEBIAN-CVE-2026-33599 |
| Debian:13 | dnsdist | 1.9.14-0+deb13u1 | DEBIAN-CVE-2026-33599 |
| Debian:14 | dnsdist | 2.0.4-1 | DEBIAN-CVE-2026-33599 |
| Ubuntu:25.10 | dnsdist | no fix listed | UBUNTU-CVE-2026-33599 |
| Ubuntu:26.04:LTS | dnsdist | no fix listed | UBUNTU-CVE-2026-33599 |
| Ubuntu:26.10 | dnsdist | no fix listed | UBUNTU-CVE-2026-33599 |
Affected products (as reported)
Weakness: CWE-125 · Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L