Vulnerability · Published Jun 25, 2026 · Assigned by OX
CVE-2026-42005Insufficient input validation of internal web server
Medium 4.3
In plain English
A medium-severity uncontrolled resource consumption in Authoritative from PowerDNS. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 50% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)4.3Medium
Exploit odds (30 days)0.6%top 49.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
An attacker can send a web request that causes unlimited memory allocation in the internal web server, leading to a denial of service. The internal web server is disabled by default.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.24 | pdns-recursor | 5.4.3-r0 | ALPINE-CVE-2026-42005 |
| Debian:12 | dnsdist | no fix listed | DEBIAN-CVE-2026-42005 |
| Debian:13 | dnsdist | 1.9.15-0+deb13u1 | DEBIAN-CVE-2026-42005 |
| Debian:14 | dnsdist | 2.1.0-1 | DEBIAN-CVE-2026-42005 |
| Debian:12 | pdns | no fix listed | DEBIAN-CVE-2026-42005 |
| Debian:13 | pdns | 4.9.16-0+deb13u1 | DEBIAN-CVE-2026-42005 |
| Debian:14 | pdns | 5.1.2-1 | DEBIAN-CVE-2026-42005 |
| Debian:12 | pdns-recursor | no fix listed | DEBIAN-CVE-2026-42005 |
| Debian:13 | pdns-recursor | 5.2.11-0+deb13u1 | DEBIAN-CVE-2026-42005 |
| Debian:14 | pdns-recursor | 5.4.3-1 | DEBIAN-CVE-2026-42005 |
| Ubuntu:25.10 | dnsdist | no fix listed | UBUNTU-CVE-2026-42005 |
| Ubuntu:26.04:LTS | dnsdist | no fix listed | UBUNTU-CVE-2026-42005 |
| Ubuntu:26.10 | dnsdist | no fix listed | UBUNTU-CVE-2026-42005 |
| Ubuntu:24.04:LTS | pdns | no fix listed | UBUNTU-CVE-2026-42005 |
| Ubuntu:25.10 | pdns | no fix listed | UBUNTU-CVE-2026-42005 |
| Ubuntu:26.04:LTS | pdns | no fix listed | UBUNTU-CVE-2026-42005 |
| Ubuntu:26.10 | pdns | no fix listed | UBUNTU-CVE-2026-42005 |
| Ubuntu:24.04:LTS | pdns-recursor | no fix listed | UBUNTU-CVE-2026-42005 |
| Ubuntu:25.10 | pdns-recursor | no fix listed | UBUNTU-CVE-2026-42005 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| PowerDNS | Authoritative | 4.9.0 – before 4.9.165.0.0 – before 5.0.65.1.0 – before 5.1.2 |
Weakness: CWE-400 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L