CVE-2026-33254 — MEDIUM (5.3)

Q: What is CVE-2026-33254?

CVE-2026-33254 is a vulnerability with a CVSS score of 5.3 (MEDIUM). An attacker can create a large number of concurrent DoQ or DoH3 connections, causing unlimited memory allocation in DNSdist and leading to a denial of service. DOQ and DoH3 are disabled by default.

Q: How severe is CVE-2026-33254?

CVE-2026-33254 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.

Q: Is there a patch for CVE-2026-33254?

Check the references section above for vendor advisories and patch information. Affected products include: Powerdns Dnsdist.

Vulnerability Description

An attacker can create a large number of concurrent DoQ or DoH3 connections, causing unlimited memory allocation in DNSdist and leading to a denial of service. DOQ and DoH3 are disabled by default.

CVSS Score

5.3

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

NONE

Integrity

NONE

Availability

LOW

Affected Products

Vendor	Product	Versions
Powerdns	Dnsdist	>= 1.9.0, < 1.9.13

Related Weaknesses (CWE)

CWE-770

References

https://www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2026-0Vendor Advisory

FAQ

What is CVE-2026-33254?

CVE-2026-33254 is a vulnerability with a CVSS score of 5.3 (MEDIUM). An attacker can create a large number of concurrent DoQ or DoH3 connections, causing unlimited memory allocation in DNSdist and leading to a denial of service. DOQ and DoH3 are disabled by default.

How severe is CVE-2026-33254?

CVE-2026-33254 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-33254?

Check the references section above for vendor advisories and patch information. Affected products include: Powerdns Dnsdist.