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Full vulnerability report · 2026
CVE-2026-35406High confidence

Aardvark-dns has incorrect error handling for malformed tcp packets

containers · aardvark-dns

6.2MediumCVSS 3.1
Recommended action
Scheduled

Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.

Patch available
Distribution package intelligence

Ubuntu vendor package status

Canonical’s release and source-package findings are shown separately from local repository availability.

1 package state
Repository candidate not checked

A published vendor fix does not prove that a matching update is enabled and installable on a particular asset. Confirm the local package candidate before scheduling remediation.

Ubuntu releaseSource packageVendor stateFixed versionEvidence
Ubuntu 24.04 LTSnoble · standard archiveaardvark-dnsUnder evaluationCanonical reports that the package might be affected and still needs evaluation or fixing.Not published in this feedCanonical record ↗Source updated 9 Sept 2026
Direct vendor intelligence

Authoritative vendor CSAF and VEX advisories

Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.

1 current
CVE-2026-35406 · CSAF 2.0 · revision 3 · finalRed Hat Product Securityaardvark-dns: Aardvark-dns: Denial of Service via truncated TCP DNS query and connection reset
2 known affected

The vendor explicitly identifies these products as affected by this CVE.

  • aardvark-dns.src (container-tools:rhel8) as a component of Red Hat Enterprise Linux 8
  • aardvark-dns (container-tools:rhel8) as a component of Red Hat Enterprise Linux 8
Summary
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.
Remediation
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Select the national-authority views to include. The exact source language is shown on each matched advisory. Your choice is remembered on this device and encoded in the shareable URL.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2026-19972

No EUVD known-exploited evidence

ENISA has published the identifier mapping but no EUVD description has been stored yet.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
Not supplied in the stored EUVD record
Advisory evidence
No linked advisory details stored yet
Recommended actionScheduled

Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.

Patch available
01

What, why and how

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.

What

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.

Why

The product does not properly control the allocation and maintenance of a limited resource.

How

An attacker operating through local access may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

What

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.

Why

The product does not properly control the allocation and maintenance of a limited resource.

How

An attacker operating through local access may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
None recorded

No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.

Likely attack path
local access → Uncontrolled Resource Consumption → cause the confidentiality, integrity or availability impact described by the vendor
Attack surface
Local
Privileges required
None: unauthenticated exploitation is possible
User interaction
None
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Unchanged: impact remains within the vulnerable component's security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-400 ↗

CWE-400: Uncontrolled Resource Consumption. The product does not properly control the allocation and maintenance of a limited resource.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.

AVLocalAttack vector: The attacker needs local access to the vulnerable system.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRNonePrivileges required: The attacker does not need an account or existing privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CNoneConfidentiality impact: No direct loss is represented by this metric.INoneIntegrity impact: No direct loss is represented by this metric.AHighAvailability impact: A successful attack can cause a major loss.
Post-exploitation / living off the land
The issue can support a local privilege or sandbox boundary transition; normal system utilities may then be available in the gained context.
UnauthenticatedCWE-400
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

BSI · German · WID-SEC-W-2026-2247Red Hat Enterprise Linux (libsolv, aardvark-dns): Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in Red Hat Enterprise Linux ausnutzen, um einen Denial of Service Angriff durchzuführen, Daten zu manipulieren oder vertrauliche Informationen offenzulegen.

Official advisory
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Patch available
Affected
aardvark-dns.src (container-tools:rhel8) as a component of Red Hat Enterprise Linux 8; aardvark-dns (container-tools:rhel8) as a component of Red Hat Enterprise Linux 8
Fixed
aardvark-dns-2:1.17.1-1.el10_2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); aardvark-dns-2:1.17.1-1.el10_2.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); aardvark-dns-2:1.17.1-1.el10_2.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); aardvark-dns-2:1.17.1-1.el10_2.src as a component of Red Hat Enterprise Linux AppStream (v. 10); aardvark-dns-2:1.17.1-1.el10_2.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); aardvark-dns-debuginfo-2:1.17.1-1.el10_2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); aardvark-dns-debuginfo-2:1.17.1-1.el10_2.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); aardvark-dns-debuginfo-2:1.17.1-1.el10_2.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); aardvark-dns-debuginfo-2:1.17.1-1.el10_2.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); aardvark-dns-debugsource-2:1.17.1-1.el10_2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); aardvark-dns-debugsource-2:1.17.1-1.el10_2.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); aardvark-dns-debugsource-2:1.17.1-1.el10_2.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); aardvark-dns-debugsource-2:1.17.1-1.el10_2.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); aardvark-dns-2:1.17.1-1.el9_8.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9); aardvark-dns-2:1.17.1-1.el9_8.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 9); aardvark-dns-2:1.17.1-1.el9_8.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9); aardvark-dns-2:1.17.1-1.el9_8.src as a component of Red Hat Enterprise Linux AppStream (v. 9); aardvark-dns-2:1.17.1-1.el9_8.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 9); aardvark-dns-debuginfo-2:1.17.1-1.el9_8.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9); aardvark-dns-debuginfo-2:1.17.1-1.el9_8.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 9); aardvark-dns-debuginfo-2:1.17.1-1.el9_8.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9); aardvark-dns-debuginfo-2:1.17.1-1.el9_8.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 9); aardvark-dns-debugsource-2:1.17.1-1.el9_8.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9); aardvark-dns-debugsource-2:1.17.1-1.el9_8.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 9); aardvark-dns-debugsource-2:1.17.1-1.el9_8.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9); aardvark-dns-debugsource-2:1.17.1-1.el9_8.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 9)
Action
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
Workaround
No verified workaround is recorded. Limit untrusted access and use least privilege until authoritative guidance is available.
04

Evidence and provenance

Published 7 Apr 2026 · Last source change 8 Apr 2026, 16:14 UTC · CWE-400 · Uncontrolled Resource Consumption

CVE recordCVE.org · 5.2
CVSS sourceCNA
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-08-14
European sourceENISA EUVD · EUVD-2026-19972
Product sourceVendor CSAF · Red Hat Product Security
Remediation sourceVendor CSAF · Red Hat Product Security
CWE sourceCNA
NVD statusNVD enriched

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates →

No material field changes have been recorded since change tracking began. Routine source refreshes and cosmetic edits are intentionally excluded.

Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Fixed release or patch reference recorded
ENISA EUVD · EUVD-2026-19972↗Vendor CSAF · Red Hat Product Security↗CVE authority or vendor reference↗Patch or update reference↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2026-35406 · cve.blacktree.nl