{"id":"CVE-2026-27854","summary":"Use after free when parsing EDNS options in Lua","details":"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.","modified":"2026-07-15T01:49:19.162107375Z","published":"2026-03-31T12:06:46.648Z","related":["SUSE-SU-2026:1618-1","SUSE-SU-2026:22319-1","openSUSE-SU-2026:10473-1","openSUSE-SU-2026:21015-1"],"database_specific":{"cna_assigner":"OX","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27854.json"},"references":[{"type":"WEB","url":"https://repo.powerdns.com/"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27854.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-27854"},{"type":"ADVISORY","url":"https://www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2026-02.html"},{"type":"PACKAGE","url":"https://github.com/PowerDNS/pdns"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/powerdns/pdns","events":[{"introduced":"298a9d67fb760a12eabe89164f92fb814572aea8"},{"fixed":"0189ba2d45e4089e96ac7cf20107b53c3d950c18"},{"introduced":"89747e81bc60d7950276d5fda3ca669fa81b7cf9"},{"fixed":"4108ae9f5f169166dba3e7f386be570304dfa224"}],"database_specific":{"extracted_events":[{"introduced":"1.9.0"},{"fixed":"1.9.12"},{"introduced":"2.0.0"},{"fixed":"2.0.3"}],"source":"CPE_RANGE","cpe":"cpe:2.3:a:powerdns:dnsdist:*:*:*:*:*:*:*:*"}}],"versions":["dnsdist-2.0.2","dnsdist-2.0.1","dnsdist-1.9.11","dnsdist-2.0.0","dnsdist-1.9.10","dnsdist-1.9.9","dnsdist-1.9.8","dnsdist-1.9.7","dnsdist-1.9.6","dnsdist-1.9.5","dnsdist-1.9.4","dnsdist-1.9.3","dnsdist-1.9.2","dnsdist-1.9.1","dnsdist-1.9.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-27854.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L"}]}