Bug 2501535 (CVE-2026-62309) - CVE-2026-62309 github.com/coredns/coredns: CoreDNS: Denial of Service via crafted UDP datagram with proxyproto plugin
Summary: CVE-2026-62309 github.com/coredns/coredns: CoreDNS: Denial of Service via cra...
Keywords:
Status: NEW
Alias: CVE-2026-62309
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
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Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-07-16 21:01 UTC by OSIDB Bzimport
Modified: 2026-08-31 16:19 UTC (History)
17 users (show)

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Description OSIDB Bzimport 2026-07-16 21:01:22 UTC 
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.
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