{"id":"CVE-2026-27854","state":"PUBLISHED","title":"Use after free when parsing EDNS options in Lua","description":"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.","publishedAt":"2026-03-31T12:06:46.648Z","updatedAt":"2026-04-02T13:46:22.087Z","severity":{"score":4.8,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L","source":"OX"},"assigner":"OX","products":["PowerDNS DNSdist"],"affected":[{"vendor":"PowerDNS","product":"DNSdist","packageName":"dnsdist","defaultStatus":"unaffected","versions":[{"version":"1.9.0","status":"affected","lessThan":"1.9.12","versionType":"semver"},{"version":"2.0.0","status":"affected","lessThan":"2.0.3","versionType":"semver"}],"collectionURL":"https://repo.powerdns.com/","repo":"https://github.com/PowerDNS/pdns","modules":["EDNS options cache"],"programFiles":["dnsdist.hh"]}],"references":["https://www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2026-02.html"],"weaknesses":["CWE-416"],"ingestedAt":"2026-10-29T20:11:31.369Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/27xxx/CVE-2026-27854.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-27854","state":"PUBLISHED","datePublished":"2026-03-31T12:06:46.648Z","dateUpdated":"2026-04-02T13:46:22.087Z","assignerShortName":"OX","assignerOrgId":"8ce71d90-2354-404b-a86e-bec2cc4e6981","dateReserved":"2026-02-24T08:46:09.373Z"},"containers":{"cna":{"title":"Use after free when parsing EDNS options in Lua","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."}],"affected":[{"vendor":"PowerDNS","product":"DNSdist","packageName":"dnsdist","defaultStatus":"unaffected","versions":[{"version":"1.9.0","status":"affected","lessThan":"1.9.12","versionType":"semver"},{"version":"2.0.0","status":"affected","lessThan":"2.0.3","versionType":"semver"}],"collectionURL":"https://repo.powerdns.com/","repo":"https://github.com/PowerDNS/pdns","modules":["EDNS options cache"],"programFiles":["dnsdist.hh"]}],"references":[{"url":"https://www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2026-02.html"}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV3_1":{"version":"3.1","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"LOW","integrityImpact":"NONE","availabilityImpact":"LOW","baseSeverity":"MEDIUM","baseScore":4.8,"vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L"}}],"problemTypes":[{"descriptions":[{"lang":"en","description":"Use After Free","type":"CWE"}]}],"providerMetadata":{"shortName":"OX","orgId":"8ce71d90-2354-404b-a86e-bec2cc4e6981","dateUpdated":"2026-04-02T13:46:22.087Z"},"datePublic":"2026-03-30T22:00:00.000Z","credits":[{"lang":"en","value":"Naoki Wakamatsu","type":"finder"}],"source":{"discovery":"UNKNOWN"},"x_generator":{"engine":"Vulnogram 1.0.1"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-03-31T13:12:37.483504Z","id":"CVE-2026-27854","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-416","type":"CWE","lang":"en","description":"CWE-416 Use After Free"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-03-31T13:12:40.678Z"}}]}}}