CVE-2026-32936

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Source
https://cve.org/CVERecord?id=CVE-2026-32936
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-32936.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-32936
Aliases
Downstream
Related
Published
2026-05-05T19:07:51.926Z
Modified
2026-05-28T03:53:05.039755299Z
Severity
  • 8.7 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CVSS Calculator
Summary
CoreDNS DoH GET path missing size validation causes CPU and memory amplification
Details

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.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/32xxx/CVE-2026-32936.json",
    "cwe_ids": [
        "CWE-400"
    ],
    "cna_assigner": "GitHub_M"
}
References

Affected packages

Git / github.com/coredns/coredns

Affected ranges

Type
GIT
Repo
https://github.com/coredns/coredns
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
17fceec6d93fd1dde5ba6888c363f131ff6d647f

Affected versions

v0.*
v0.9.10
v0.9.9
Other
v001
v002
v003
v004
v005
v006
v007
v008
v009
v010
v011
v1.*
v1.0.0
v1.0.1
v1.0.2
v1.0.3
v1.0.5
v1.0.6
v1.1.0
v1.1.1
v1.1.2
v1.1.3
v1.1.4
v1.10.0
v1.10.1
v1.11.0
v1.11.1
v1.11.3
v1.11.4
v1.12.0
v1.12.1
v1.12.2
v1.12.3
v1.12.4
v1.13.0
v1.13.1
v1.13.2
v1.14.0
v1.14.1
v1.14.2
v1.2.0
v1.2.1
v1.2.2
v1.2.3
v1.2.4
v1.2.5
v1.2.6
v1.3.0
v1.3.1
v1.4.0
v1.5.0
v1.5.1
v1.5.2
v1.6.0
v1.6.1
v1.6.2
v1.6.3
v1.6.4
v1.6.5
v1.6.6
v1.6.7
v1.6.8
v1.6.9
v1.7.0
v1.7.1
v1.8.0
v1.8.1
v1.8.2
v1.8.3
v1.8.4
v1.8.5
v1.8.6
v1.8.7
v1.9.0
v1.9.1
v1.9.2
v1.9.3
v1.9.4

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-32936.json"