PT-2026-34437 · Powerdns · Dnsdist

Haruto Kimura · Published 2026-04-22 · Updated 2026-04-28 · CVE-2026-33593

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

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

Name of the Vulnerable Software and Affected Versions PowerDNS dnsdist versions 1.9.0 through 1.9.12 PowerDNS dnsdist versions 2.0.0 through 2.0.3

Description An unauthenticated remote attacker can cause a denial-of-service by sending a crafted DNSCrypt query. This action triggers a divide-by-zero error, which leads to a crash of internet-facing instances with DNSCrypt enabled.

Recommendations Update PowerDNS dnsdist versions 1.9.0 through 1.9.12 to version 1.9.13. Update PowerDNS dnsdist versions 2.0.0 through 2.0.3 to version 2.0.4.

Fix

DoS

Divide By Zero

Weakness Enumeration

CWE-369

Related Identifiers

CVE-2026-33593

OPENSUSE-SU-2026:10632-1

Affected Products

Dnsdist

References · 23

• https://osv.dev/vulnerability/UBUNTU-CVE-2026-33593 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-33593 · Vendor Advisory
• https://dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2026-04.html · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-33593 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-33593 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-33593 · Security Note
• https://osv.dev/vulnerability/openSUSE-SU-2026:10632-1 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-33593 · Vendor Advisory
• https://suse.com/security/cve/CVE-2026-33260 · Note
• https://suse.com/security/cve/CVE-2026-33602 · Note
• https://suse.com/security/cve/CVE-2026-33597 · Note
• https://suse.com/security/cve/CVE-2026-33595 · Note
• https://suse.com/security/cve/CVE-2026-33254 · Note
• https://suse.com/security/cve/CVE-2026-33257 · Note
• https://dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2026-04.html#cve-2026-33593-denial-of-service-via-crafted-dnscrypt-query · Note