CVE-2025-68151

EPSS 0.21%

CoreDNS gRPC/HTTPS/HTTP3 servers lack resource limits, enabling DoS via unbounded connections and oversized messages

發布日:2026/1/8修改日:2026/2/4
也稱為:GHSA-527x-5wrf-22m2CGA-f6c8-358q-hcm4GO-2026-4289

描述

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. ### Impact #### 1. Missing connection and stream limits (gRPC / HTTPS / HTTP3) The affected servers do not enforce reasonable upper bounds on concurrent connections or active streams. An attacker can: - Open many parallel connections - Rapidly issue requests without limit - Consume memory until the CoreDNS process becomes unresponsive or is terminated by the OOM killer Testing demonstrates that modest resource configurations (e.g., 256 MB RAM) can be exhausted quickly. Increasing concurrency parameters in the PoCs allows attackers to scale the impact. #### 2. Missing message-size validation in the gRPC server The gRPC server accepts arbitrarily large protobuf messages (default limit ~4 MB per request) without validating against DNS protocol constraints (maximum 64 KB). Sending multiple concurrent oversized messages can quickly exhaust available memory. This vulnerability mirrors earlier hardening work in PR https://github.com/coredns/coredns/pull/7490, which applied checks for upstream proxying but left server-side request validation unprotected. #### Result: In all cases, remote unauthenticated attackers can reliably trigger memory exhaustion and cause a denial of service. ### Patches _v1.14.0_

受影響套件(2)

CVSS 分數

來源版本嚴重程度向量
osvCVSS 4.0—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/E:U

參考連結(5)