Is CVE-2026-33261 in the CISA KEV catalog?

No. CVE-2026-33261 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-33261?

CVE-2026-33261 has a CVSS v3 base score of 5.9 (MEDIUM).

What is the EPSS score for CVE-2026-33261?

CVE-2026-33261 has an EPSS score of 0.23% (14th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-33261?

Upgrade pdns-recursor on debian 13 to 5.2.9-0+deb13u1 or later.

CVE & CISA-KEV Catalog

CVE-2026-33261

MEDIUM

5.9

CVSS v3

NVD

Description

A zone transition from NSEC to NSEC3 might trigger an internal inconsistency and cause a denial of service.

CWE-353

How to fix

Remediation Available

pdns-recursorDebian

Fixed in:5.2.9-0+deb13u1CVE-2026-33261

Fixed in:5.4.1-1CVE-2026-33261

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

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 ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

0.23%probability of exploitation in 30 days

14thpercentile

Low risk: more likely to be exploited than 14% of all known CVEs.

References

Vendor Advisory1

docs.powerdns.com

Related Vulnerabilities

Other CWE-353 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2021-28545	High	8.1	2.3%	-	-
CVE-2021-28546	Medium	6.5	1.4%	-	-
CVE-2019-10943	High	7.5	1.0%	-	Fix
CVE-2020-10124	High	7.1	0.7%	-	-
CVE-2020-7878	Critical	9.8	0.7%	-	-
CVE-2020-7808	High	8.7	0.7%	-	-

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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 2026-04-27.