What is CVE-2026-33259?

CVE-2026-33259 is a medium-severity vulnerability in Powerdns Recursor. CVSS score: 5.0/10. Published 2026-04-22.

How severe is CVE-2026-33259?

Medium severity. CVSS v3 base score is 5.0 out of 10.

Vulnerability in Powerdns Recursor

CVE-2026-33259

Having many concurrent transfers of the same RPZ can lead to inconsistent RPZ data, use after free and/or a crash of the recursor. Normally concurrent transfers of the same RPZ zone can only occur with a malfunctioning RPZ provider.

EPSS: 0.000 (0.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.0 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:H.

Affected products

Powerdns Recursor — versions 5.4.0, 5.3.0, 5.2.0

References

docs.powerdns.com/recursor/security-advisories/powerdns-advisory-powerdns-2026-…

Frequently asked questions

What is CVE-2026-33259?: CVE-2026-33259 is a medium-severity vulnerability in Powerdns Recursor. CVSS score: 5.0/10. Published 2026-04-22.
How severe is CVE-2026-33259?: Medium severity. CVSS v3 base score is 5.0 out of 10.