CoreDNS gRPC/HTTPS/HTTP3 servers lack resource limits, enabling DoS via unbounded connections and oversized messages
Published Jan 8, 2026
6.6
MEDIUMCVSS 4.0
EPSS 0.49%
Description
CoreDNS is a DNS server that chains plugins. Prior to version 1.14.0, multiple CoreDNS server implementations (gRPC, HTTPS, and HTTP/3) lack critical resource-limiting controls. An unauthenticated remote attacker can exhaust memory and degrade or crash the server by opening many concurrent connections, streams, or sending oversized request bodies. The issue is similar in nature to CVE-2025-47950 (QUIC DoS) but affects additional server types that do not enforce connection limits, stream limits, or message size constraints. Version 1.14.0 contains a patch.
Affected products
-
- Version < 1.14.0StatusaffectedConstraints-
- Version
- < 1.14.0
No data.
Red Hat Advanced Cluster Management for Kubernetes 2.13
rhacm2/lighthouse-agent-rhel9:1782924920
Fixed · RHSA-2026:36873
Red Hat Advanced Cluster Management for Kubernetes 2.13
rhacm2/lighthouse-coredns-rhel9:1782924937
Fixed · RHSA-2026:36873
Red Hat Advanced Cluster Management for Kubernetes 2.14
rhacm2/lighthouse-coredns-rhel9:1780204249
Fixed · RHSA-2026:25127
Red Hat Advanced Cluster Management for Kubernetes 2.15
rhacm2/lighthouse-coredns-rhel9:1774086225
Fixed · RHSA-2026:8151
Red Hat OpenShift Container Platform 4
openshift4/ose-coredns
Not affected
Red Hat OpenShift Container Platform 4
openshift4/ose-coredns-rhel9
Affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Advanced Cluster Management for Kubernetes 2.13 | rhacm2/lighthouse-agent-rhel9:1782924920 | Fixed | RHSA-2026:36873 |
| Red Hat Advanced Cluster Management for Kubernetes 2.13 | rhacm2/lighthouse-coredns-rhel9:1782924937 | Fixed | RHSA-2026:36873 |
| Red Hat Advanced Cluster Management for Kubernetes 2.14 | rhacm2/lighthouse-coredns-rhel9:1780204249 | Fixed | RHSA-2026:25127 |
| Red Hat Advanced Cluster Management for Kubernetes 2.15 | rhacm2/lighthouse-coredns-rhel9:1774086225 | Fixed | RHSA-2026:8151 |
| Red Hat OpenShift Container Platform 4 | openshift4/ose-coredns | Not affected | n/a |
| Red Hat OpenShift Container Platform 4 | openshift4/ose-coredns-rhel9 | Affected | n/a |
github.com/coredns/coredns
Go
Introduced 0 Fixed 1.14.0
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| Go | github.com/coredns/coredns | 0 | 1.14.0 |
Remediation
Red Hat mitigation
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
References (9)
- https://access.redhat.com/security/cve/CVE-2025-68151 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2428009 Issue Tracking
- https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-1476 Advisory
- https://github.com/advisories/GHSA-527x-5wrf-22m2 Advisory
- https://github.com/coredns/coredns/commit/0d8cbb1a6bcb6bc9c1a489865278b8725fa20812 x_refsource_MISCPatch
- https://github.com/coredns/coredns/pull/7490 x_refsource_MISCIssue TrackingPatch
- https://github.com/coredns/coredns/security/advisories/GHSA-527x-5wrf-22m2 x_refsource_CONFIRMThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2025-68151
- https://www.cve.org/CVERecord?id=CVE-2025-68151
| Link | Providers | Tags |
|---|---|---|
| https://access.redhat.com/security/cve/CVE-2025-68151 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=2428009 | Issue Tracking | |
| https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-1476 | Advisory | |
| https://github.com/advisories/GHSA-527x-5wrf-22m2 | Advisory | |
| https://github.com/coredns/coredns/commit/0d8cbb1a6bcb6bc9c1a489865278b8725fa20812 | x_refsource_MISCPatch | |
| https://github.com/coredns/coredns/pull/7490 | x_refsource_MISCIssue TrackingPatch | |
| https://github.com/coredns/coredns/security/advisories/GHSA-527x-5wrf-22m2 | x_refsource_CONFIRMThird Party Advisory | |
| https://nvd.nist.gov/vuln/detail/CVE-2025-68151 | ||
| https://www.cve.org/CVERecord?id=CVE-2025-68151 |
Change history (0)
No recorded changes yet.