CVE catalog
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 decodin
- Severity
- High · CVSS 8.7
- Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.67% · Oct 25, 2026
A flaw was found in CoreDNS, a DNS server that chains plugins. A remote, unauthenticated attacker can exploit this vulnerability by repeatedly sending oversized DNS-over-HTTPS (DoH) GET requests. The GET path, unlike the POST path, lacks size validation before processing large `dns=` query parameter values. This can lead to high CPU usage, significant memory allocations, and increased garbage collection, resulting in a Denial of Service (DoS). github.com/coredns/coredns: CoreDNS: Denial of Service via oversized DNS-over-HTTPS GET requests The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Cpe | coredns | Not reported | 1.14.3 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Cpe | coredns | cpe | Not reported | 1.14.3 | Not reported | Not reported | Not reported |
OpenFactory catalog packages
No matching packages in this catalog.
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_20703-1.json]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-32936]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-32936.json]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-1283.json]
[CERT-Bund public advisories] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]