CVE-2026-27854

An attacker might be able to trigger a use-after-free by sending crafted DNS queries to a DNSdist using the DNSQuestion:getEDNSOptions method in custom Lua code. In some cases DNSQuestion:getEDNSOptions might refer to a version of the DNS packet that has been modified, thus triggering a use-after-free and potentially a crash resulting in denial of service.

CVSS v3 4.8 MEDIUM

4.8^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.2 / Impact : 2.5

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact NONE

Availability Impact LOW

Scope UNCHANGED

References

Link	Resource
https://www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2026-02.html	Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:powerdns:dnsdist::::::::
	cpe:2.3:a:powerdns:dnsdist::::::::

History

No history.

Information

Published : 2026-03-31 12:16

Updated : 2026-07-25 11:10

NVD link : CVE-2026-27854

Mitre link : CVE-2026-27854

CVE.ORG link : CVE-2026-27854

JSON object : View

Products Affected

powerdns

dnsdist

CWE

CWE-416

Use After Free

{"id": "CVE-2026-27854", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-27854", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-03-31T13:12:37.483504Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security@open-xchange.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 4.8, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "LOW", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}, "impactScore": 2.5, "exploitabilityScore": 2.2}, {"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 3.9}]}, "affected": [{"source": "security@open-xchange.com", "affectedData": [{"repo": "https://github.com/PowerDNS/pdns", "vendor": "PowerDNS", "modules": ["EDNS options cache"], "product": "DNSdist", "versions": [{"status": "affected", "version": "1.9.0", "lessThan": "1.9.12", "versionType": "semver"}, {"status": "affected", "version": "2.0.0", "lessThan": "2.0.3", "versionType": "semver"}], "packageName": "dnsdist", "programFiles": ["dnsdist.hh"], "collectionURL": "https://repo.powerdns.com/", "defaultStatus": "unaffected"}]}], "published": "2026-03-31T12:16:28.053", "references": [{"url": "https://www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2026-02.html", "tags": ["Vendor Advisory"], "source": "security@open-xchange.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "description": [{"lang": "en", "value": "CWE-416"}]}], "descriptions": [{"lang": "en", "value": "An attacker might be able to trigger a use-after-free by sending crafted DNS queries to a DNSdist using the DNSQuestion:getEDNSOptions method in custom Lua code. In some cases DNSQuestion:getEDNSOptions might refer to a version of the DNS packet that has been modified, thus triggering a use-after-free and potentially a crash resulting in denial of service."}, {"lang": "es", "value": "Un atacante podr\u00eda desencadenar un uso despu\u00e9s de liberaci\u00f3n enviando consultas DNS manipuladas a un DNSdist utilizando el m\u00e9todo DNSQuestion:getEDNSOptions en c\u00f3digo Lua personalizado. En algunos casos, DNSQuestion:getEDNSOptions podr\u00eda referirse a una versi\u00f3n del paquete DNS que ha sido modificada, desencadenando as\u00ed un uso despu\u00e9s de liberaci\u00f3n y potencialmente un fallo que resultar\u00eda en denegaci\u00f3n de servicio."}], "lastModified": "2026-07-25T11:10:00.100", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:powerdns:dnsdist:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "628B3B94-81DE-496E-B36A-B79A3DFFE1F4", "versionEndExcluding": "1.9.12", "versionStartIncluding": "1.9.0"}, {"criteria": "cpe:2.3:a:powerdns:dnsdist:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "9AC850DD-FDD8-4C48-B861-4BBAF423FF57", "versionEndExcluding": "2.0.3", "versionStartIncluding": "2.0.0"}], "operator": "OR"}]}], "sourceIdentifier": "security@open-xchange.com"}