What is CVE-2026-33261?

CVE-2026-33261 is a medium-severity vulnerability in Powerdns Recursor, classified under CWE-353. CVSS score: 5.9/10. Published 2026-04-22.

How severe is CVE-2026-33261?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Vulnerability in Powerdns Recursor

CVE-2026-33261

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

Published 2026-04-22 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.002 (12.7th percentile), scored 2026-10-19.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 13th percentile — 12.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000

Affected products

Powerdns Recursor — versions 5.4.0, 5.3.0, 5.2.0

Weakness classification (CWE)

CWE-353

References

docs.powerdns.com/recursor/security-advisories/powerdns-advisory-powerdns-2026-… (Broken Link, Vendor Advisory)

Frequently asked questions

What is CVE-2026-33261?: CVE-2026-33261 is a medium-severity vulnerability in Powerdns Recursor, classified under CWE-353. CVSS score: 5.9/10. Published 2026-04-22.
How severe is CVE-2026-33261?: Medium severity. CVSS v3 base score is 5.9 out of 10.