{"id":"CVE-2026-32934","summary":"CoreDNS DNS-over-QUIC unbounded goroutine growth leads to denial of service","details":"CoreDNS is a DNS server that chains plugins. In versions prior to 1.14.3, the DNS-over-QUIC (DoQ) server can be driven into unbounded goroutine and memory growth by a remote client that opens many QUIC streams and sends only 1 byte per stream. When the worker pool is full, CoreDNS still spawns a goroutine per accepted stream to wait for a worker token. Additionally, active workers block indefinitely in io.ReadFull() with no per-stream read deadline, allowing an attacker to pin all workers by sending a single byte so the read blocks waiting for the second byte of the DoQ length prefix. This enables an unauthenticated remote attacker to cause memory exhaustion and OOM-kill. This issue has been fixed in version 1.14.3. No known workarounds exist.","aliases":["GHSA-2wpx-qpw2-g5h5","GO-2026-4969"],"modified":"2026-05-28T03:52:48.586050801Z","published":"2026-05-05T19:06:17.080Z","related":["CGA-cj8w-hr6g-6wvx","openSUSE-SU-2026:20703-1"],"database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-770"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/32xxx/CVE-2026-32934.json"},"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-2026-32934.json"},{"type":"ADVISORY","url":"https://github.com/coredns/coredns/security/advisories/GHSA-2wpx-qpw2-g5h5"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-32934"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/coredns/coredns","events":[{"introduced":"0"},{"fixed":"17fceec6d93fd1dde5ba6888c363f131ff6d647f"}]}],"versions":["v1.14.2","v1.14.1","v1.14.0","v1.13.2","v1.13.1","v1.13.0","v1.12.4","v1.12.3","v1.12.2","v1.12.1","v1.12.0","v1.11.4","v1.11.3","v1.11.1","v1.11.0","v1.10.1","v1.10.0","v1.9.4","v1.9.3","v1.9.2","v1.9.1","v1.9.0","v1.8.7","v1.8.6","v1.8.5","v1.8.4","v1.8.3","v1.8.2","v1.8.1","v1.8.0","v1.7.1","v1.7.0","v1.6.9","v1.6.8","v1.6.7","v1.6.6","v1.6.5","v1.6.4","v1.6.3","v1.6.2","v1.6.1","v1.6.0","v1.5.2","v1.5.1","v1.5.0","v1.4.0","v1.3.1","v1.3.0","v1.2.6","v1.2.5","v1.2.4","v1.2.3","v1.2.2","v1.2.1","v1.2.0","v1.1.4","v1.1.3","v1.1.2","v1.1.1","v1.1.0","v1.0.6","v1.0.5","v1.0.3","v1.0.2","v1.0.1","v1.0.0","v0.9.10","v0.9.9","v011","v010","v009","v008","v007","v006","v005","v004","v003","v002","v001"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-32934.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"}]}