CVE-2026-35406

Description

A flaw was found in aardvark-dns where a specially crafted TCP DNS query followed by a connection reset can trigger an infinite error loop, leading to 100% CPU usage and a denial of service. As aardvark-dns is only accessible via internal Podman networks, this issue can be exploited by a local container with network access.

Mitigation

As a mitigation, avoid using aardvark-dns when container name resolution is not required by creating Podman networks with DNS disabled (e.g., podman network create --disable-dns). This prevents the vulnerable component from being used.

Common Vulnerability Scoring System (CVSS) Score Details

Info alert:Important note

CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).

CVSS v3 Score Breakdown

Red HatNVDcve.org
Base Score6.57.56.2
Attack VectorNetworkNetworkLocal
Attack ComplexityLowLowLow
Privileges RequiredLowNoneNone
User InteractionNoneNoneNone
ScopeUnchangedUnchangedUnchanged
ConfidentialityNoneNoneNone
Integrity ImpactNoneNoneNone
Availability ImpactHighHighHigh

Vector

Red Hat: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

cve.org: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Understanding the Weakness (CWE)

CWE-835

Availability

Technical Impact: DoS: Resource Consumption (CPU); DoS: Resource Consumption (Memory); DoS: Amplification

An infinite loop will cause unexpected consumption of resources, such as CPU cycles or memory. The software's operation may slow down, or cause a long time to respond.

Frequently Asked Questions

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