{"id":"GHSA-2wpx-qpw2-g5h5","revision":null,"records":[{"revision":"0985414a705448a2acdb7195df7182ae","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-32934","aliases":[],"title":"CoreDNS DNS-over-QUIC unbounded goroutine growth leads to denial of service","description":"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.","state":0,"publishedAt":"2026-05-05T19:06:17.08+00:00","modifiedAt":"2026-05-06T15:14:54.79+00:00","affected":[{"ecosystem":"Vendor product","name":"coredns","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"coredns\",\n                    \"product\": \"coredns\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 1.14.3\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"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","score":8.7,"severity":"HIGH"}],"references":["https://github.com/coredns/coredns/security/advisories/GHSA-2wpx-qpw2-g5h5","https://github.com/coredns/coredns/releases/tag/v1.14.3"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-32934","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-32934","identifiers":["CVE-2026-32934"]},"retained":false,"historicalAffected":[]},{"revision":"3d87a32110ff4f8881258b8982bc636d","observedAt":"2026-11-15T09:36:36.2+00:00","statement":{"source":"euvd","id":"EUVD-2026-27440","aliases":["CVE-2026-32934","GHSA-2wpx-qpw2-g5h5"],"title":"CoreDNS is a DNS server that chains plugins. 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No known workarounds exist.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 4.0","vector":"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","score":8.7,"severity":null}],"references":["https://github.com/coredns/coredns/security/advisories/GHSA-2wpx-qpw2-g5h5","https://github.com/coredns/coredns/releases/tag/v1.14.3"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-27440","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"May 5, 2026, 7:06:17 PM","dateUpdated":"May 6, 2026, 3:14:54 PM"},"relatedAdvisories":[{"id":"msrc_CVE-2026-32934","title":"CoreDNS DNS-over-QUIC unbounded goroutine growth leads to denial of service","vulnerabilityIds":["CVE-2026-32934"]},{"id":"WID-SEC-W-2026-1283","title":"CoreDNS: Mehrere Schwachstellen ermöglichen","vulnerabilityIds":["CVE-2026-33190","CVE-2026-33489","CVE-2026-35579","CVE-2026-32934","CVE-2026-32936"]},{"id":"openSUSE-SU-2026:20703-1","title":"Security update for coredns","vulnerabilityIds":["CVE-2026-27140","CVE-2026-27143","CVE-2026-27144","CVE-2026-32282","CVE-2026-32283","CVE-2026-32288","CVE-2026-32289","CVE-2026-32934","CVE-2026-32936","CVE-2026-33190","CVE-2026-33489","CVE-2026-33810","CVE-2026-35579"]}],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-27440","identifiers":["EUVD-2026-27440","CVE-2026-32934","GHSA-2wpx-qpw2-g5h5"]},"retained":false,"historicalAffected":[]},{"revision":"8aaf3c22127245cb9b890f0e873b2ed5","observedAt":"2026-10-25T07:19:26.892+00:00","statement":{"source":"nvd","id":"CVE-2026-32934","aliases":[],"title":"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 stre…","description":"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.","state":0,"publishedAt":"2026-05-05T20:16:35.853+00:00","modifiedAt":"2026-07-25T11:10:00.1+00:00","affected":[],"metrics":[{"system":"CVSS 4.0 · security-advisories@github.com · Secondary","vector":"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","score":8.7,"severity":"HIGH"},{"system":"CVSS 3.1 · nvd@nist.gov · Primary","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5,"severity":"HIGH"}],"references":["https://github.com/coredns/coredns/releases/tag/v1.14.3","https://github.com/coredns/coredns/security/advisories/GHSA-2wpx-qpw2-g5h5"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-32934","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Analyzed","weaknesses":["CWE-770"],"productCriteria":["cpe:2.3:a:coredns.io:coredns:*:*:*:*:*:*:*:*"],"sourceDates":{"published":"2026-05-05T20:16:35.853","lastModified":"2026-07-25T11:10:00.100"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-32934","identifiers":["CVE-2026-32934"]},"retained":false,"historicalAffected":[]},{"revision":"61d3ca69306241feafcfa30efe094108","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GHSA-2wpx-qpw2-g5h5","aliases":["CVE-2026-32934","GO-2026-4969"],"title":"CoreDNS' DoQ worker pool does not bound stream backlog","description":"### Summary\nCoreDNS' DNS-over-QUIC (DoQ) server can be driven into large goroutine and memory growth by a remote client that opens many QUIC streams and stalls after sending only 1 byte. Even with a small configured quic { worker_pool_size ... }, CoreDNS still spawns a goroutine per accepted stream (workers + waiters) and active workers can block indefinitely in io.ReadFull() with no per-stream read deadline, enabling unauthenticated remote DoS via memory exhaustion/OOM-kill.\n\n### Details\nCoreDNS' DoQ server uses a global worker pool (streamProcessPool) to limit concurrent stream processing, but when the pool is full it still spawns a goroutine per accepted stream that waits to acquire a worker token: select { case s.streamProcessPool <- ...: go ...; default: go ... wait for token ... } (core/dnsserver/server_quic.go)\n\nAdditionally, the DoQ message framing reads are blocking io.ReadFull() calls with no per-stream read deadline: readDOQMessage() reads the 2-byte length prefix and message body via io.ReadFull() (core/dnsserver/server_quic.go)\n\nThis allows an attacker to pin all workers by sending 1 byte (so io.ReadFull() blocks waiting for the second byte of the DoQ length prefix), while also creating an unbounded backlog of goroutines waiting for a worker token.\n\nNote: this appears to be a result of an incomplete fix/regression for CVE-2025-47950 (GHSA-cvx7-x8pj-x2gw).\n\n### PoC\n1. Adjust COREDNS_BIN in the PoC to point at right path (see the top-level const definitions for tunables as well)\n2. Run python3 ./doq-dos-repro.py\n3. Expected sample output:\n*** Start CoreDNS ***\nCorefile: /tmp/vh-f003-doq-mem-regression/Corefile\nLog: /tmp/vh-f003-doq-mem-regression/coredns.log\n\n*** Baseline sample (idle) ***\nrss_kib=49380 go_goroutines=17\n\n*** Build + run partial-stream flooder ***\ngo: downloading golang.org/x/net v0.43.0\ngo: downloading golang.org/x/crypto v0.41.0\ngo: downloading go.uber.org/mock v0.5.2\ngo: downloading github.com/stretchr/testify v1.11.1\ngo: downloading golang.org/x/sys v0.35.0\ngo: downloading github.com/pmezard/go-difflib v1.0.0\ngo: downloading github.com/davecgh/go-spew v1.1.1\ngo: downloading gopkg.in/yaml.v3 v3.0.1\n\n*** Candidate sample (during attack) ***\nrss_kib=137968 go_goroutines=15557\n\n*** Flooder output ***\nopened conns=60 streams_per_conn=256 total_streams=15360\n\n*** Wrote results ***\n/tmp/vh-f003-doq-mem-regression/results.json\n\n*** OK ***\nDoQ flood caused goroutine/RSS growth despite worker_pool_size.\n\n\n### Impact\nUnauthenticated remote DoS on an encrypted DNS transport via goroutine/RSS growth leading to OOM-kill/crash and service outage.","state":0,"publishedAt":"2026-04-28T22:40:38+00:00","modifiedAt":"2026-09-10T03:51:00.9352195+00:00","affected":[{"ecosystem":"Go","name":"github.com/coredns/coredns","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"1.14.3"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":null,"severity":null},{"system":"CVSS_V4","vector":"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","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"HIGH"}],"references":["https://github.com/coredns/coredns/security/advisories/GHSA-2wpx-qpw2-g5h5","https://github.com/coredns/coredns/security/advisories/GHSA-cvx7-x8pj-x2gw","https://nvd.nist.gov/vuln/detail/CVE-2026-32934","https://github.com/coredns/coredns","https://github.com/coredns/coredns/releases/tag/v1.14.3"],"sourceUrl":"https://github.com/advisories/GHSA-2wpx-qpw2-g5h5","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-2wpx-qpw2-g5h5","identifiers":["GHSA-2wpx-qpw2-g5h5","CVE-2026-32934","GO-2026-4969"]},"retained":false,"historicalAffected":[]},{"revision":"953027a4dbf44952bd717ba0b6d4a1aa","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GO-2026-4969","aliases":["CVE-2026-32934","GHSA-2wpx-qpw2-g5h5"],"title":"CoreDNS' DoQ worker pool does not bound stream backlog in github.com/coredns/coredns","description":"CoreDNS' DoQ worker pool does not bound stream backlog in github.com/coredns/coredns","state":0,"publishedAt":"2026-05-20T19:07:16+00:00","modifiedAt":"2026-06-11T18:29:25.8768924+00:00","affected":[{"ecosystem":"Go","name":"github.com/coredns/coredns","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"1.14.3"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[],"references":["https://github.com/coredns/coredns/security/advisories/GHSA-2wpx-qpw2-g5h5","https://nvd.nist.gov/vuln/detail/CVE-2026-32934","https://github.com/coredns/coredns/releases/tag/v1.14.3","https://github.com/coredns/coredns/security/advisories/GHSA-cvx7-x8pj-x2gw"],"sourceUrl":"https://osv.dev/vulnerability/GO-2026-4969","license":"OSV · upstream source license applies","key":"osv:GO-2026-4969","identifiers":["GO-2026-4969","CVE-2026-32934","GHSA-2wpx-qpw2-g5h5"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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