Vulnerability Details 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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 49.3%
CVSS Severity
CVSS v3 Score 7.5
References
Products affected by CVE-2026-32934
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cpe:2.3:a:coredns.io:coredns:-
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cpe:2.3:a:coredns.io:coredns:0.9.10
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cpe:2.3:a:coredns.io:coredns:0.9.9
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cpe:2.3:a:coredns.io:coredns:001
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cpe:2.3:a:coredns.io:coredns:1.0.0
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cpe:2.3:a:coredns.io:coredns:1.0.1
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cpe:2.3:a:coredns.io:coredns:1.0.2
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cpe:2.3:a:coredns.io:coredns:1.0.3
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cpe:2.3:a:coredns.io:coredns:1.0.4
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cpe:2.3:a:coredns.io:coredns:1.0.5
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cpe:2.3:a:coredns.io:coredns:1.0.6
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cpe:2.3:a:coredns.io:coredns:1.1.0
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cpe:2.3:a:coredns.io:coredns:1.1.1
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cpe:2.3:a:coredns.io:coredns:1.1.2
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cpe:2.3:a:coredns.io:coredns:1.1.3
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cpe:2.3:a:coredns.io:coredns:1.1.4
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cpe:2.3:a:coredns.io:coredns:1.10.0
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cpe:2.3:a:coredns.io:coredns:1.10.1
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cpe:2.3:a:coredns.io:coredns:1.11.0
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cpe:2.3:a:coredns.io:coredns:1.11.1
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cpe:2.3:a:coredns.io:coredns:1.11.3
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cpe:2.3:a:coredns.io:coredns:1.11.4
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cpe:2.3:a:coredns.io:coredns:1.12.0
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cpe:2.3:a:coredns.io:coredns:1.12.1
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cpe:2.3:a:coredns.io:coredns:1.12.2
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cpe:2.3:a:coredns.io:coredns:1.12.3
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cpe:2.3:a:coredns.io:coredns:1.12.4
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cpe:2.3:a:coredns.io:coredns:1.13.0
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cpe:2.3:a:coredns.io:coredns:1.13.1
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cpe:2.3:a:coredns.io:coredns:1.2.0
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cpe:2.3:a:coredns.io:coredns:1.2.1
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cpe:2.3:a:coredns.io:coredns:1.2.2
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cpe:2.3:a:coredns.io:coredns:1.2.3
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cpe:2.3:a:coredns.io:coredns:1.2.4
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cpe:2.3:a:coredns.io:coredns:1.2.5
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cpe:2.3:a:coredns.io:coredns:1.2.6
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cpe:2.3:a:coredns.io:coredns:1.3.0
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cpe:2.3:a:coredns.io:coredns:1.3.1
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cpe:2.3:a:coredns.io:coredns:1.4.0
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cpe:2.3:a:coredns.io:coredns:1.5.0
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cpe:2.3:a:coredns.io:coredns:1.5.1
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cpe:2.3:a:coredns.io:coredns:1.5.2
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cpe:2.3:a:coredns.io:coredns:1.6.0
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cpe:2.3:a:coredns.io:coredns:1.6.1
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cpe:2.3:a:coredns.io:coredns:1.6.2
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cpe:2.3:a:coredns.io:coredns:1.6.3
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cpe:2.3:a:coredns.io:coredns:1.6.4
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cpe:2.3:a:coredns.io:coredns:1.6.5
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cpe:2.3:a:coredns.io:coredns:1.6.6
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cpe:2.3:a:coredns.io:coredns:1.6.7
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cpe:2.3:a:coredns.io:coredns:1.6.8
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cpe:2.3:a:coredns.io:coredns:1.6.9
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cpe:2.3:a:coredns.io:coredns:1.7.0
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cpe:2.3:a:coredns.io:coredns:1.7.1
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cpe:2.3:a:coredns.io:coredns:1.8.0
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cpe:2.3:a:coredns.io:coredns:1.8.1
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cpe:2.3:a:coredns.io:coredns:1.8.2
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cpe:2.3:a:coredns.io:coredns:1.8.3
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cpe:2.3:a:coredns.io:coredns:1.8.4
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cpe:2.3:a:coredns.io:coredns:1.8.5
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cpe:2.3:a:coredns.io:coredns:1.8.6
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cpe:2.3:a:coredns.io:coredns:1.8.7
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cpe:2.3:a:coredns.io:coredns:1.9.0
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cpe:2.3:a:coredns.io:coredns:1.9.1
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cpe:2.3:a:coredns.io:coredns:1.9.2
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cpe:2.3:a:coredns.io:coredns:1.9.3
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cpe:2.3:a:coredns.io:coredns:1.9.4