{"id":"CVE-2026-32936","aliases":["GHSA-63cw-r7xf-jmwr","GO-2026-5164"],"url":"https://o3.security/vulnerability/CVE-2026-32936","summary":"CoreDNS DoH GET path missing size validation causes CPU and memory amplification","details":"CoreDNS is a DNS server that chains plugins. In versions prior to 1.14.3, the DNS-over-HTTPS (DoH) GET path accepts oversized dns= query parameter values and performs URL query parsing, base64 decoding, and DNS message unpacking before rejecting the request. Unlike the POST path, which applies a bounded read via http.MaxBytesReader limited to 65536 bytes, the GET path has no equivalent size validation before expensive processing. A remote, unauthenticated attacker can repeatedly send oversized DoH GET requests to force high CPU usage, large transient memory allocations, and elevated garbage-collection pressure, leading to denial of service. This issue has been fixed in version 1.14.3.","published":"2026-05-05T19:07:51.926Z","modified":"2026-08-05T03:32:13.310814477Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/coredns/coredns","fixedVersion":"1.14.3"}],"fix":null,"references":[{"type":"WEB","url":"https://github.com/coredns/coredns/releases/tag/v1.14.3"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/32xxx/CVE-2026-32936.json"},{"type":"ADVISORY","url":"https://github.com/coredns/coredns/security/advisories/GHSA-63cw-r7xf-jmwr"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-32936"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-05T03:32:13.310814477Z"}}