CoreDNS DNS-over-QUIC unbounded goroutine growth leads to denial of service_CVE-2026-32934

{
    "lastseen": "",
    "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.",
    "published": "2026-05-05T19:06:17.080Z",
    "modified": "2026-05-05T19:06:17.080Z",
    "type": "cve",
    "title": "CoreDNS DNS-over-QUIC unbounded goroutine growth leads to denial of service",
    "source": "GitHub_M",
    "references": "https://github.com/coredns/coredns/security/advisories/GHSA-2wpx-qpw2-g5h5\nhttps://github.com/coredns/coredns/releases/tag/v1.14.3",
    "id": "CVE-2026-32934",
    "bulletinFamily": "",
    "cwe": [
        "CWE-770"
    ],
    "cvelist": null,
    "sourceData": "coredns coredns < 1.14.3",
    "sourceHref": "",
    "cvss": {
        "score": 8.7,
        "severity": "HIGH",
        "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",
        "version": "4.0"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "coredns",
    "version": "< 1.14.3",
    "vendor": "coredns",
    "ai_description": "Unauthenticated remote attacker can cause memory exhaustion and OOM-kill via DNS-over-QUIC server",
    "ai_severity": "High",
    "ai_vendor": "CoreDNS Team",
    "ai_product": "CoreDNS",
    "ai_version": "< 1.14.3",
    "ai_score": 8.7
}