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{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[1.9.0,1.9.13)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[2.0.0,2.0.4)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "DNSdist", "source": "cna", "vendor": "PowerDNS"}, "product": "dnsdist", "vendor": "powerdns"}], "analysis": {"en": {"generated_at": "2026-04-27T19:17:53.155354+00:00", "value": {"mitigation_remediation": ["Verify that the autoUpgrade/auto_upgrade settings are disabled in DNSdist configuration files", "If the DDR upgrade is required, apply the latest available DNSdist release once a vendor fix is published", "Monitor DNSdist logs and network traffic for unexpected SVCB responses from unauthorized backends"], "summary": {"action": "Disable DDR upgrade", "impact": "Out\u2011of\u2011bounds read triggered by a crafted DNS SVCB response during Discovery of Designated Resolvers"}, "threat_synthesis": {"affected_systems": "The vulnerability affects the PowerDNS DNSdist service. No specific product or software version is listed in the advisory, and the feature is disabled by default. Any deployment that has enabled autoUpgrade or auto_upgrade is susceptible.", "description_and_impact": "A rogue DNS backend can send a specially crafted SVCB record to DNSdist when the autoUpgrade option in Lua or the auto_upgrade setting in YAML is enabled. The malformed response triggers an out\u2011of\u2011bounds read in the service discovery code, potentially allowing an attacker to read unintended memory contents from the DNSdist process. This is a modest confidentiality risk and may cause a crash if exploited, but does not provide direct code execution or privilege escalation.", "risk_and_exploitability": "The CVSS score of 3.1 classifies this as low severity. EPSS data is not available, and the issue is not listed in CISA\u2019s KEV catalog, indicating a limited likelihood of real\u2011world exploitation. The attack vector is likely a remote backend with network ability to send DNS responses; however, the vulnerable code is only exercised when the DDR feature is active, which remains turned off in default configurations. No public exploit exists; the risk is primarily informational unless the configuration is mis\u2011controlled."}}}}, "created": "2026-04-22T20:30:26.555476+00:00", "updated": "2026-04-27T19:30:12.038034+00:00", "vendors": ["powerdns", "powerdns$PRODUCT$dnsdist"]}