Description

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.

INFO

Published Date :

2026-05-05T19:07:51.926Z

Last Modified :

2026-05-05T19:32:25.341Z

Source :

GitHub_M
AFFECTED PRODUCTS

The following products are affected by CVE-2026-32936 vulnerability.

Vendors Products
Coredns.io
  • Coredns
REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-32936.

URL Resource
https://github.com/coredns/coredns/releases/tag/v1.14.3 cve-icon cve-icon
https://github.com/coredns/coredns/security/advisories/GHSA-63cw-r7xf-jmwr cve-icon cve-icon cve-icon
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CVSS Vulnerability Scoring System

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Detailed values of each vector for above chart.
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