{"id":"UBUNTU-CVE-2026-27854","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":"2026-05-20T16:12:17.174372919Z","published":"2026-03-31T12:16:00Z","upstream":["CVE-2026-27854"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-27854"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-27854"},{"type":"REPORT","url":"https://www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2026-02.html"},{"type":"REPORT","url":"https://downloads.powerdns.com/patches/2026-02/"}],"affected":[{"package":{"name":"dnsdist","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/dnsdist?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.0.0~alpha2-1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.0.0~alpha2-1","binary_name":"dnsdist"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-27854.json"}},{"package":{"name":"dnsdist","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/dnsdist?arch=source&distro=esm-apps%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.2.0-1","1.2.0-3","1.2.1-1","1.2.1-1build1","1.2.1-1ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.2.1-1ubuntu0.1~esm1","binary_name":"dnsdist"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-27854.json"}},{"package":{"name":"dnsdist","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/dnsdist?arch=source&distro=esm-apps%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.4.0~rc3-1","1.4.0-1","1.4.0-1build1","1.4.0-1build2","1.4.0-1ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.4.0-1ubuntu0.1~esm1","binary_name":"dnsdist"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-27854.json"}},{"package":{"name":"dnsdist","ecosystem":"Ubuntu:Pro:22.04:LTS","purl":"pkg:deb/ubuntu/dnsdist?arch=source&distro=esm-apps%2Fjammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.5.1-3build2","1.6.1-1build1","1.6.1-1ubuntu0.1~esm1","1.6.1-1ubuntu0.1~esm2"],"ecosystem_specific":{"binaries":[{"binary_version":"1.6.1-1ubuntu0.1~esm2","binary_name":"dnsdist"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-27854.json"}},{"package":{"name":"dnsdist","ecosystem":"Ubuntu:Pro:24.04:LTS","purl":"pkg:deb/ubuntu/dnsdist?arch=source&distro=esm-apps%2Fnoble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.8.0-1","1.8.2-1","1.8.2-2","1.8.2-3","1.8.3-1","1.8.3-2","1.8.3-2build1","1.8.3-2build2","1.8.3-2ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.8.3-2ubuntu0.1~esm1","binary_name":"dnsdist"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-27854.json"}},{"package":{"name":"dnsdist","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/dnsdist?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.9.8-1","1.9.10-1","1.9.10-1ubuntu0.1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.9.10-1ubuntu0.1","binary_name":"dnsdist"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-27854.json"}},{"package":{"name":"dnsdist","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/dnsdist?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.9.10-1","2.0.1-1","2.0.2-1","2.0.2-1build1"],"ecosystem_specific":{"binaries":[{"binary_version":"2.0.2-1build1","binary_name":"dnsdist"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-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"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}