Use After Free 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.
Vulnerability class: Use-After-Free
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.003 (17.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 17th percentile — 17.1% 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: 0.003 · change: +0.000
Affected products
- Powerdns Recursor — versions 5.4.0, 5.3.0, 5.2.0
Weakness classification (CWE)
References
- docs.powerdns.com/recursor/security-advisories/powerdns-advisory-powerdns-2026-… (Broken Link, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-33259?
- CVE-2026-33259 is a medium-severity vulnerability in Powerdns Recursor, classified under Use After Free. 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.