{"id":"CVE-2026-27853","summary":"Out-of-bounds write when rewriting large DNS packets","details":"An attacker might be able to trigger an out-of-bounds write by sending crafted DNS responses to a DNSdist using the DNSQuestion:changeName or DNSResponse:changeName methods in custom Lua code. In some cases the rewritten packet might become larger than the initial response and even exceed 65535 bytes, potentially leading to a crash resulting in denial of service.","modified":"2026-07-15T01:49:15.997016096Z","published":"2026-03-31T12:04:23.419Z","related":["SUSE-SU-2026:1618-1","SUSE-SU-2026:22319-1","openSUSE-SU-2026:21015-1"],"database_specific":{"cna_assigner":"OX","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27853.json"},"references":[{"type":"WEB","url":"https://repo.powerdns.com/"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27853.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-27853"},{"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":{"cpe":"cpe:2.3:a:powerdns:dnsdist:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"1.9.0"},{"fixed":"1.9.12"},{"introduced":"2.0.0"},{"fixed":"2.0.3"}],"source":"CPE_RANGE"}}],"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-2026-27853.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:N/I:N/A:H"}]}