Resource exhaustion in CoreDNS - CVE-2026-32934
Published: April 25, 2026
Vulnerability identifier: #VU127720
CSH Severity: Medium
CVSS v4.0: 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/U:Green
CVE-ID: CVE-2026-32934
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: CoreDNS
Affected software:
CoreDNS
CoreDNS
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to uncontrolled resource consumption in the DoQ server worker pool and stream handling in core/dnsserver/server_quic.go when processing many QUIC streams that stall after sending only 1 byte. A remote attacker can open many QUIC streams and stop before completing the DoQ length prefix to cause a denial of service.
The issue can lead to large goroutine and memory growth, potentially resulting in an OOM kill and service outage.
How to mitigate CVE-2026-32934
Install security update from vendor's website.