CVE-2025-68151 CoreDNS gRPC/HTTPS/HTTP3 servers lack resource limits, enabling DoS via unbounded connections and oversized messages
Unauthenticated attackers can crash CoreDNS servers by exhausting resources via unbounded connections or oversized messages in gRPC, HTTPS, and HTTP/3 protocols.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-68151?
CVE-2025-68151 is a medium-severity denial of service vulnerability in coredns, published on 8 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-770
Which versions are affected by CVE-2025-68151?
3 open source packages ship an affected version, including github.com/coredns/coredns. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
github.com/coredns/coredns Go | All versions | 1.14.0 |
github.com/coredns/coredns Go | All versions | 1.14.0 |
github.com/coredns/coredns Go | All versions | 1.14.0 |
Products include Coredns.io Coredns.
How do I fix CVE-2025-68151?
Upgrade github.com/coredns/coredns to 1.14.0 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2025-68151 being exploited?
There is no known exploitation of CVE-2025-68151 in the wild and no public exploit code.
Other vulnerabilities in coredns
- CVE-2026-32934 CoreDNS DNS-over-QUIC unbounded goroutine growth leads to denial of service
- CVE-2026-32936 CoreDNS DoH GET path missing size validation causes CPU and memory amplification
- CVE-2026-33190 CoreDNS TSIG authentication bypass on encrypted DNS transports
- CVE-2026-33489 CoreDNS transfer plugin subzone ACL bypass via lexicographic zone comparison
- CVE-2026-35579 CoreDNS TSIG authentication bypass on gRPC, QUIC, DoH, and DoH3 transports
Sources
Also known as AZL-73850, AZL-74025, CLEANSTART-2026-DK58903, CLEANSTART-2026-UC13907, ECHO-f181-da3d-daf3, GHSA-527x-5wrf-22m2 and 20 more.