CVE-2026-35406

Received Received - Intake

Infinite Loop CPU Exhaustion in Aardvark-dns TCP Queries

Publication date: 2026-04-07

Last updated on: 2026-04-16

Assigner: GitHub, Inc.

Description

Aardvark-dns is an authoritative dns server for A/AAAA container records. From 1.16.0 to 1.17.0, a truncated TCP DNS query followed by a connection reset causes aardvark-dns to enter an unrecoverable infinite error loop at 100% CPU. This vulnerability is fixed in 1.17.1.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-04-07

Last Modified

2026-04-16

Generated

2026-07-06

AI Q&A

2026-04-08

EPSS Evaluated

2026-07-05

NVD

CVE-2026-35406

Affected Vendors & Products

Vendor	Product	Version / Range
containers	aardvark-dns	From 1.16.0 (inc) to 1.17.1 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-835	The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop.
CWE-400	The product does not properly control the allocation and maintenance of a limited resource.

Attack-Flow Graph

Executive Summary

This vulnerability affects aardvark-dns, an authoritative DNS server for A/AAAA container records. Specifically, versions from 1.16.0 to 1.17.0 are impacted. When a truncated TCP DNS query is followed by a connection reset, the server enters an unrecoverable infinite error loop that consumes 100% CPU.

This issue was fixed in version 1.17.1 of aardvark-dns.

Impact Analysis

The vulnerability can cause the aardvark-dns server to enter an infinite error loop, resulting in 100% CPU usage. This can lead to denial of service as the server becomes unresponsive or unable to process legitimate DNS queries.

Mitigation Strategies

To mitigate this vulnerability, upgrade aardvark-dns to version 1.17.1 or later, where the issue is fixed.

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