CVE-2026-35406: Aardvark-dns has incorrect error handling for malformed tcp packets

Published Apr 7, 2026
·
Updated

Impact

A truncated TCP DNS query followed by a connection reset causes aardvark-dns to enter an unrecoverable infinite error loop at 100% CPU.

Patches https://github.com/containers/aardvark-dns/commit/3b49ea7b38bdea134b7f03256f2e13f44ce73bb1

Workarounds None

Credits

Thanks to @dkane01 for reporting this

Other sources

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.

— MITRE

Affected Software

2 affected componentsFixes available
rust/netavark>=1.16.0<=1.17.0
1.17.1
containers aardvark-dns>=1.16.0<1.17.1

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade rust/netavark to a version that resolves this vulnerability.

    Fixed in 1.17.1
  2. Upgrade

    Upgrade aardvark-dns to a version that resolves this vulnerability.

    Fixed in 1.17.1Patch 3b49ea7b38bdea134b7f03256f2e13f44ce73bb1

Event History

Apr 7, 2026
Advisory Published
via GitHub·08:13 PM
Data Sourced
via GitHub·08:13 PM
DescriptionSeverityWeaknessAffected Software
CVE Published
via MITRE·09:32 PM
Data Sourced
via MITRE·09:32 PM
DescriptionSeverityWeakness
Data Sourced
via Red Hat·10:01 PM
DescriptionSeverityAffected Software
Data Sourced
via NVD·10:16 PM
DescriptionSeverityWeakness
Data Sourced
via NVD·10:16 PM
RemedyAffected Software
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