How severe is CVE-2026-33254?

CVE-2026-33254 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.

Is CVE-2026-33254 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (29th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-33254?

CVE-2026-33254 affects Powerdns Dnsdist. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-33254?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-33254 have an EU (EUVD) identifier?

Yes. CVE-2026-33254 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-24927.

When was CVE-2026-33254 published?

CVE-2026-33254 was published on 2026-04-22 and last updated on 2026-06-17.

CVE-2026-33254

CVE-2026-33254 is a medium-severity vulnerability in Powerdns Dnsdist with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-770.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
EPSS exploit prediction: 0% (29th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-24927
Weakness: CWE-770
Affected product: Powerdns Dnsdist
Published: 2026-04-22
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-33254?: 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 a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.
Is CVE-2026-33254 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (29th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-33254?: CVE-2026-33254 affects Powerdns Dnsdist. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-33254?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-33254 have an EU (EUVD) identifier?: Yes. CVE-2026-33254 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-24927.
When was CVE-2026-33254 published?: CVE-2026-33254 was published on 2026-04-22 and last updated on 2026-06-17.

References

https://www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2026-04.html

Affected products (1)

cpe:2.3:a:powerdns:dnsdist:*:*:*:*:*:*:*:*

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