CVE-2026-33261

MEDIUMNVD 5.95.9—

5.9

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

CVSS v3: 5.9
EG Score: 5.9(high)
EPSS: 0.0%
KEV: Not listed

Published

April 22, 2026

Last Modified

April 27, 2026

References (1)

security@open-xchangehttps://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-powerdns-2026-03.html

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-353

Data Freshness Timeline

(refreshed 8× in last 7d / 10× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-31 00:16 UTCepss_batch
2026-05-31 00:16 UTCepss_batch
2026-05-31 00:16 UTCepss_batch
2026-05-29 13:44 UTCepss_batch
2026-05-29 13:44 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-20 16:17 UTCEG score recompute
2026-05-20 16:17 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2026-33261?

CVE-2026-33261 is a medium vulnerability published on April 22, 2026. A zone transition from NSEC to NSEC3 might trigger an internal inconsistency and cause a denial of service.

When was CVE-2026-33261 disclosed?

CVE-2026-33261 was first published in the National Vulnerability Database on April 22, 2026, with the most recent update on April 27, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2026-33261 actively exploited?

CVE-2026-33261 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

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

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

How do I remediate CVE-2026-33261?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-33261, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2026-33261

📅 Published

🔄 Last Modified

🔗 References (1)

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2026-33261?

🔗 Related CVEs(same CWE)

Same CWE

Published

Last Modified

References (1)

Frequently asked(5)

Related CVEs(same CWE)