Vulnerability Details CVE-2026-32936
CoreDNS is a DNS server that chains plugins. In versions prior to 1.14.3, the DNS-over-HTTPS (DoH) GET path accepts oversized dns= query parameter values and performs URL query parsing, base64 decoding, and DNS message unpacking before rejecting the request. Unlike the POST path, which applies a bounded read via http.MaxBytesReader limited to 65536 bytes, the GET path has no equivalent size validation before expensive processing. A remote, unauthenticated attacker can repeatedly send oversized DoH GET requests to force high CPU usage, large transient memory allocations, and elevated garbage-collection pressure, leading to denial of service. This issue has been fixed in version 1.14.3.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 13.4%
CVSS Severity
CVSS v3 Score 7.5
References
Products affected by CVE-2026-32936
-
cpe:2.3:a:coredns.io:coredns:-
-
cpe:2.3:a:coredns.io:coredns:0.9.10
-
cpe:2.3:a:coredns.io:coredns:0.9.9
-
cpe:2.3:a:coredns.io:coredns:001
-
cpe:2.3:a:coredns.io:coredns:1.0.0
-
cpe:2.3:a:coredns.io:coredns:1.0.1
-
cpe:2.3:a:coredns.io:coredns:1.0.2
-
cpe:2.3:a:coredns.io:coredns:1.0.3
-
cpe:2.3:a:coredns.io:coredns:1.0.4
-
cpe:2.3:a:coredns.io:coredns:1.0.5
-
cpe:2.3:a:coredns.io:coredns:1.0.6
-
cpe:2.3:a:coredns.io:coredns:1.1.0
-
cpe:2.3:a:coredns.io:coredns:1.1.1
-
cpe:2.3:a:coredns.io:coredns:1.1.2
-
cpe:2.3:a:coredns.io:coredns:1.1.3
-
cpe:2.3:a:coredns.io:coredns:1.1.4
-
cpe:2.3:a:coredns.io:coredns:1.10.0
-
cpe:2.3:a:coredns.io:coredns:1.10.1
-
cpe:2.3:a:coredns.io:coredns:1.11.0
-
cpe:2.3:a:coredns.io:coredns:1.11.1
-
cpe:2.3:a:coredns.io:coredns:1.11.3
-
cpe:2.3:a:coredns.io:coredns:1.11.4
-
cpe:2.3:a:coredns.io:coredns:1.12.0
-
cpe:2.3:a:coredns.io:coredns:1.12.1
-
cpe:2.3:a:coredns.io:coredns:1.12.2
-
cpe:2.3:a:coredns.io:coredns:1.12.3
-
cpe:2.3:a:coredns.io:coredns:1.12.4
-
cpe:2.3:a:coredns.io:coredns:1.13.0
-
cpe:2.3:a:coredns.io:coredns:1.13.1
-
cpe:2.3:a:coredns.io:coredns:1.2.0
-
cpe:2.3:a:coredns.io:coredns:1.2.1
-
cpe:2.3:a:coredns.io:coredns:1.2.2
-
cpe:2.3:a:coredns.io:coredns:1.2.3
-
cpe:2.3:a:coredns.io:coredns:1.2.4
-
cpe:2.3:a:coredns.io:coredns:1.2.5
-
cpe:2.3:a:coredns.io:coredns:1.2.6
-
cpe:2.3:a:coredns.io:coredns:1.3.0
-
cpe:2.3:a:coredns.io:coredns:1.3.1
-
cpe:2.3:a:coredns.io:coredns:1.4.0
-
cpe:2.3:a:coredns.io:coredns:1.5.0
-
cpe:2.3:a:coredns.io:coredns:1.5.1
-
cpe:2.3:a:coredns.io:coredns:1.5.2
-
cpe:2.3:a:coredns.io:coredns:1.6.0
-
cpe:2.3:a:coredns.io:coredns:1.6.1
-
cpe:2.3:a:coredns.io:coredns:1.6.2
-
cpe:2.3:a:coredns.io:coredns:1.6.3
-
cpe:2.3:a:coredns.io:coredns:1.6.4
-
cpe:2.3:a:coredns.io:coredns:1.6.5
-
cpe:2.3:a:coredns.io:coredns:1.6.6
-
cpe:2.3:a:coredns.io:coredns:1.6.7
-
cpe:2.3:a:coredns.io:coredns:1.6.8
-
cpe:2.3:a:coredns.io:coredns:1.6.9
-
cpe:2.3:a:coredns.io:coredns:1.7.0
-
cpe:2.3:a:coredns.io:coredns:1.7.1
-
cpe:2.3:a:coredns.io:coredns:1.8.0
-
cpe:2.3:a:coredns.io:coredns:1.8.1
-
cpe:2.3:a:coredns.io:coredns:1.8.2
-
cpe:2.3:a:coredns.io:coredns:1.8.3
-
cpe:2.3:a:coredns.io:coredns:1.8.4
-
cpe:2.3:a:coredns.io:coredns:1.8.5
-
cpe:2.3:a:coredns.io:coredns:1.8.6
-
cpe:2.3:a:coredns.io:coredns:1.8.7
-
cpe:2.3:a:coredns.io:coredns:1.9.0
-
cpe:2.3:a:coredns.io:coredns:1.9.1
-
cpe:2.3:a:coredns.io:coredns:1.9.2
-
cpe:2.3:a:coredns.io:coredns:1.9.3
-
cpe:2.3:a:coredns.io:coredns:1.9.4