PT-2026-34436 · Powerdns · Dnsdist

Published 2026-04-22 · Updated 2026-04-28 · CVE-2026-33254

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 DNSdist (affected versions not specified)

Description An attacker can create a large number of concurrent DoQ (DNS over QUIC) or DoH3 (DNS over HTTP/3) connections, causing unlimited memory allocation and leading to a denial of service. DoQ and DoH3 are disabled by default.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability. As a temporary workaround, ensure that DoQ and DoH3 remain disabled.

DoS

Allocation of Resources Without Limits

Weakness Enumeration

CWE-770

Related Identifiers

CVE-2026-33254

OPENSUSE-SU-2026:10632-1

Affected Products

Dnsdist

References · 22

• https://cve.org/CVERecord?id=CVE-2026-33254 · Security Note
• https://ubuntu.com/security/CVE-2026-33254 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-33254 · Vendor Advisory
• https://dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2026-04.html · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2026:10632-1 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-33254 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-33254 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-33254 · Vendor Advisory
• https://suse.com/security/cve/CVE-2026-33260 · Note
• https://suse.com/security/cve/CVE-2026-33602 · Note
• https://twitter.com/CVEnew/status/2047012139202998758 · Twitter Post
• https://suse.com/security/cve/CVE-2026-33597 · Note
• https://dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2026-04.html#cve-2026-33254-resource-exhaustion-via-doq-doh3-connections · Note
• https://suse.com/security/cve/CVE-2026-33595 · Note
• https://twitter.com/VulmonFeeds/status/2047012185973404028 · Twitter Post