{"id":"OESA-2026-4018","summary":"coredns security update","details":"CoreDNS is a fast and flexible DNS server. The key word here is flexible: with CoreDNS you are able to do what you want with your DNS data by utilizing plugins.\r\n\r\nSecurity Fix(es):\n\nAn issue was discovered in CoreDNS through 1.10.1. There is a vulnerability in DNS resolving software, which triggers a resolver to ignore valid responses, thus causing denial of service for normal resolution. In an exploit, the attacker could just forge a response targeting the source port of a vulnerable resolver without the need to guess the correct TXID.(CVE-2023-28452)\n\nCoreDNS through 1.10.1 enables attackers to achieve DNS cache poisoning and inject fake responses via a birthday attack.(CVE-2023-30464)\n\nCoreDNS 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.(CVE-2026-32936)","modified":"2026-09-25T01:45:08.556568108Z","published":"2026-09-25T01:27:22Z","upstream":["CVE-2023-28452","CVE-2023-30464","CVE-2026-32936"],"database_specific":{"severity":"High"},"references":[{"type":"ADVISORY","url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4018"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-28452"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-30464"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-32936"}],"affected":[{"package":{"name":"coredns","ecosystem":"openEuler:24.03-LTS-SP3","purl":"pkg:rpm/openEuler/coredns&distro=openEuler-24.03-LTS-SP3"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.7.0-1.10.oe2403sp3"}]}],"ecosystem_specific":{"src":["coredns-1.7.0-1.10.oe2403sp3.src.rpm"],"x86_64":["coredns-1.7.0-1.10.oe2403sp3.x86_64.rpm","coredns-help-1.7.0-1.10.oe2403sp3.x86_64.rpm"],"aarch64":["coredns-1.7.0-1.10.oe2403sp3.aarch64.rpm","coredns-help-1.7.0-1.10.oe2403sp3.aarch64.rpm"]},"database_specific":{"source":"https://repo.openeuler.org/security/data/osv/OESA-2026-4018.json"}},{"package":{"name":"coredns","ecosystem":"openEuler:24.03-LTS-SP4","purl":"pkg:rpm/openEuler/coredns&distro=openEuler-24.03-LTS-SP4"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.7.0-1.10.oe2403sp4"}]}],"ecosystem_specific":{"aarch64":["coredns-1.7.0-1.10.oe2403sp4.aarch64.rpm","coredns-help-1.7.0-1.10.oe2403sp4.aarch64.rpm"],"src":["coredns-1.7.0-1.10.oe2403sp4.src.rpm"],"x86_64":["coredns-1.7.0-1.10.oe2403sp4.x86_64.rpm","coredns-help-1.7.0-1.10.oe2403sp4.x86_64.rpm"]},"database_specific":{"source":"https://repo.openeuler.org/security/data/osv/OESA-2026-4018.json"}},{"package":{"name":"coredns","ecosystem":"openEuler:20.03-LTS-SP4","purl":"pkg:rpm/openEuler/coredns&distro=openEuler-20.03-LTS-SP4"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.7.0-1.7.oe2003sp4"}]}],"ecosystem_specific":{"x86_64":["coredns-1.7.0-1.7.oe2003sp4.x86_64.rpm","coredns-help-1.7.0-1.7.oe2003sp4.x86_64.rpm"],"aarch64":["coredns-1.7.0-1.7.oe2003sp4.aarch64.rpm","coredns-help-1.7.0-1.7.oe2003sp4.aarch64.rpm"],"src":["coredns-1.7.0-1.7.oe2003sp4.src.rpm"]},"database_specific":{"source":"https://repo.openeuler.org/security/data/osv/OESA-2026-4018.json"}},{"package":{"name":"coredns","ecosystem":"openEuler:22.03-LTS-SP4","purl":"pkg:rpm/openEuler/coredns&distro=openEuler-22.03-LTS-SP4"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.7.0-1.9.oe2203sp4"}]}],"ecosystem_specific":{"aarch64":["coredns-1.7.0-1.9.oe2203sp4.aarch64.rpm","coredns-help-1.7.0-1.9.oe2203sp4.aarch64.rpm"],"src":["coredns-1.7.0-1.9.oe2203sp4.src.rpm"],"x86_64":["coredns-1.7.0-1.9.oe2203sp4.x86_64.rpm","coredns-help-1.7.0-1.9.oe2203sp4.x86_64.rpm"]},"database_specific":{"source":"https://repo.openeuler.org/security/data/osv/OESA-2026-4018.json"}},{"package":{"name":"coredns","ecosystem":"openEuler:24.03-LTS-SP1","purl":"pkg:rpm/openEuler/coredns&distro=openEuler-24.03-LTS-SP1"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.7.0-1.10.oe2403sp1"}]}],"ecosystem_specific":{"src":["coredns-1.7.0-1.10.oe2403sp1.src.rpm"],"x86_64":["coredns-1.7.0-1.10.oe2403sp1.x86_64.rpm","coredns-help-1.7.0-1.10.oe2403sp1.x86_64.rpm"],"aarch64":["coredns-1.7.0-1.10.oe2403sp1.aarch64.rpm","coredns-help-1.7.0-1.10.oe2403sp1.aarch64.rpm"]},"database_specific":{"source":"https://repo.openeuler.org/security/data/osv/OESA-2026-4018.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}