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    CVE-2026-62309

    CoreDNS is a DNS server written in Go. Prior to 1.14.4, a single 28-byte UDP datagram can crash the CoreDNS process when the proxyproto plugin is enabled because plugin/pkg/proxyproto/proxyproto.go PacketConn.ReadFrom handles a PROXY v2 header with non-UDP transport such as family byte 0x11, reassigns addr from a nil readFrom result after parseProxyProtocol errors, and calls addr.String() in the warning log before ServeDNS recovery applies. This issue is fixed in version 1.14.4.

    Published:Jul 16, 2026
    Last Modified:Jul 30, 2026
    EPS:Jul 16, 2026
    EPSS Score:0.00377
    CVSS Score:7.5

    Affected Products

    Vendor
    Coredns.io
    Product
    Coredns

    Exploits

    https://github.com/coredns/coredns/security/advisories/GHSA-9rvv-m5g5-wc8r

    Common Weakness Enumeration

    CWE-476 NULL Pointer Dereference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

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    CVE-2026-26018 (CVSS 7.5) — CoreDNS is a DNS server that chains plugins. Prior to version 1.14.2, a denial of service vulnerability exists…
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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