What’s Vulnerable › Vulnerabilities

CVE-2025-68151: CoreDNS gRPC/HTTPS/HTTP3 servers lack resource limits, enabling DoS via unbounded connections and oversized messages

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-01-08 · updated 2026-10-14
• Weakness: CWE-770

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

• coredns: before 1.14.0 — fixed in 1.14.0

How to fix

Upgrade to a fixed version: coredns 1.14.0. Check the vendor advisory for mitigations.

References

• https://github.com/coredns/coredns/commit/0d8cbb1a6bcb6bc9c1a489865278b8725fa20812
• https://github.com/coredns/coredns/pull/7490
• https://github.com/coredns/coredns/security/advisories/GHSA-527x-5wrf-22m2

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