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Vulnerability · Published Apr 22, 2026 · Assigned by OX

CVE-2026-33257Insufficient input validation of internal webserver

Medium 5.3

In plain English

A medium-severity resource allocation without limits 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 0.5% (higher than 44% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.3Medium
Exploit odds (30 days)0.5%top 56.0% 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

EcosystemPackageFixed inAdvisory
Alpine:v3.23dnsdist2.0.4-r0ALPINE-CVE-2026-33257
Alpine:v3.24dnsdist2.0.4-r0ALPINE-CVE-2026-33257
Alpine:v3.23pdns5.0.4-r0ALPINE-CVE-2026-33257
Alpine:v3.24pdns5.0.4-r0ALPINE-CVE-2026-33257
Debian:12dnsdistno fix listedDEBIAN-CVE-2026-33257
Debian:13dnsdist1.9.14-0+deb13u1DEBIAN-CVE-2026-33257
Debian:14dnsdist2.0.4-1DEBIAN-CVE-2026-33257
Debian:12pdnsno fix listedDEBIAN-CVE-2026-33257
Debian:13pdns4.9.14-0+deb13u1DEBIAN-CVE-2026-33257
Debian:14pdns5.0.4-1DEBIAN-CVE-2026-33257
Debian:12pdns-recursorno fix listedDEBIAN-CVE-2026-33257
Debian:13pdns-recursor5.2.9-0+deb13u1DEBIAN-CVE-2026-33257
Debian:14pdns-recursor5.3.0-1DEBIAN-CVE-2026-33257
Ubuntu:25.10dnsdistno fix listedUBUNTU-CVE-2026-33257
Ubuntu:26.04:LTSdnsdistno fix listedUBUNTU-CVE-2026-33257
Ubuntu:26.10dnsdistno fix listedUBUNTU-CVE-2026-33257
Ubuntu:24.04:LTSpdnsno fix listedUBUNTU-CVE-2026-33257
Ubuntu:25.10pdnsno fix listedUBUNTU-CVE-2026-33257
Ubuntu:26.04:LTSpdnsno fix listedUBUNTU-CVE-2026-33257
Ubuntu:26.10pdnsno fix listedUBUNTU-CVE-2026-33257
Ubuntu:24.04:LTSpdns-recursorno fix listedUBUNTU-CVE-2026-33257
Ubuntu:25.10pdns-recursorno fix listedUBUNTU-CVE-2026-33257

Affected products (as reported)

VendorProductVersions
PowerDNS Authoritative 5.0.0 – before 5.0.44.9.0 – before 4.9.14
PowerDNS DNSdist 1.9.0 – before 1.9.132.0.0 – before 2.0.4
PowerDNS Recursor 5.4.0 – before 5.4.15.3.0 – before 5.3.65.2.0 – before 5.2.9

Weakness: CWE-770 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

References