SB2026090135 - Allocation of Resources Without Limits or Throttling in CoreDNS

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Main Vulnerability Database SB2026090135

SB2026090135 - Allocation of Resources Without Limits or Throttling in CoreDNS

Published: September 1, 2026

Security Bulletin ID SB2026090135
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Allocation of Resources Without Limits or Throttling (CVE-ID: CVE-2026-82399)

CWE-ID: CWE-770 - Allocation of Resources Without Limits or Throttling

CVSSv4: 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]


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.


Remediation

Install update from vendor's website.

References