Allocation of Resources Without Limits or Throttling in CoreDNS - CVE-2026-82399
Published: September 1, 2026
Vulnerability identifier: #VU146575
CSH Severity: Medium
CVSS v4: 8.7 [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]
CVE-ID: CVE-2026-82399
CWE-ID: CWE-770
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to allocation of resources without limits or throttling in custom DNS request transport handlers when parsing crafted DNS messages on DNS-over-HTTPS, DNS-over-QUIC, or DNS-over-gRPC listeners. A remote attacker can send a specially crafted request to cause a denial of service.
Only deployments exposing DoH, DoH3, DoQ, or DNS-over-gRPC to an attacker are vulnerable, while ordinary UDP and TCP listeners are not affected.
Affected software
CoreDNS
How to mitigate CVE-2026-82399
Install security update from vendor's website.
CoreDNS - update to 1.14.7