CVE-2026-33261
CVE-2026-33261 is a medium-severity vulnerability in Powerdns Recursor with a CVSS 3.x base score of 5.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-353.
Key facts
- Severity: Medium (CVSS 3.x base score 5.9)
- EPSS exploit prediction: 0% (14th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-24727
- Weakness: CWE-353
- Affected product: Powerdns Recursor
- Published:
- Last modified:
Description
A zone transition from NSEC to NSEC3 might trigger an internal inconsistency and cause a denial of service.
Frequently asked questions
- What is CVE-2026-33261?
- A zone transition from NSEC to NSEC3 might trigger an internal inconsistency and cause a denial of service.
- How severe is CVE-2026-33261?
- CVE-2026-33261 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
- Is CVE-2026-33261 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-33261?
- CVE-2026-33261 primarily affects Powerdns Recursor. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2026-33261?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2026-33261 have an EU (EUVD) identifier?
- Yes. CVE-2026-33261 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-24727.
- When was CVE-2026-33261 published?
- CVE-2026-33261 was published on 2026-04-22 and last updated on 2026-06-17.
References
Affected products (2)
- cpe:2.3:a:powerdns:recursor:*:*:*:*:*:*:*:*
- cpe:2.3:a:powerdns:recursor:5.4.0:*:*:*:*:*:*:*
More vulnerabilities in Powerdns Recursor
- CVE-2009-4009 — Critical (CVSS 10.0): Buffer overflow in PowerDNS Recursor before 3.1.7.2 allows remote attackers to cause a denial of service (daemon crash)…
- CVE-2020-10030 — High (CVSS 8.8): An issue has been found in PowerDNS Recursor 4.1.0 up to and including 4.3.0. It allows an attacker (with enough…
- CVE-2025-59023 — High (CVSS 8.2): Crafted delegations or IP fragments can poison cached delegations in Recursor.
- CVE-2019-3806 — High (CVSS 8.1): An issue has been found in PowerDNS Recursor versions after 4.1.3 before 4.1.9 where Lua hooks are not properly applied…
- CVE-2015-5470 — High (CVSS 7.8): The label decompression functionality in PowerDNS Recursor before 3.6.4 and 3.7.x before 3.7.3 and Authoritative (Auth)…
- CVE-2015-1868 — High (CVSS 7.8): The label decompression functionality in PowerDNS Recursor 3.5.x, 3.6.x before 3.6.3, and 3.7.x before 3.7.2 and…
All CVEs affecting Powerdns Recursor →
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