Is CVE-2026-0398 in the CISA KEV catalog?

No. CVE-2026-0398 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-0398?

CVE-2026-0398 has a CVSS v3 base score of 5.3 (MEDIUM).

What is the EPSS score for CVE-2026-0398?

CVE-2026-0398 has an EPSS score of 0.41% (33th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-0398?

Upgrade pdns-recursor on debian 13 to 5.2.8-0+deb13u1 or later.

CVE & CISA-KEV Catalog

CVE-2026-0398

MEDIUM

5.3

CVSS v3

NVD

Description

Crafted zones can lead to increased resource usage and crafted CNAME chains can lead to cache poisoning in Recursor.

CWE-770Allocation of Resources Without Limits or Throttling

How to fix

Remediation Available

pdns-recursorDebian

Fixed in:5.2.8-0+deb13u1CVE-2026-0398

Fixed in:5.3.5-1CVE-2026-0398

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityLow

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

Exploit Intelligence

0.41%probability of exploitation in 30 days

33rdpercentile

Low risk: more likely to be exploited than 33% of all known CVEs.

References

Vendor Advisory1

docs.powerdns.com

Related Vulnerabilities

Other CWE-770 (Allocation of Resources Without Limits or Throttling) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-50387	High	7.5	100%	-	Fix
CVE-2019-11478	Medium	5.3	95%	-	Fix
CVE-2019-11479	High	7.5	92%	-	Fix
CVE-2024-27316	High	7.5	91%	-	Fix
CVE-2022-30522	High	7.5	90%	-	Fix
CVE-2019-9515	High	7.5	88%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-20.