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    CVE-2026-32934

    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:May 5, 2026
    Last Modified:May 8, 2026
    EPS:May 5, 2026
    EPSS Score:0.00141
    CVSS Score:7.5

    Affected Products

    Vendor
    Coredns.io
    Product
    Coredns

    Exploits

    https://github.com/coredns/coredns/security/advisories/GHSA-2wpx-qpw2-g5h5https://github.com/coredns/coredns/security/advisories/GHSA-2wpx-qpw2-g5h5

    Related CVEs

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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High