CVE-2026-35406

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{"affected": [{"affectedData": [{"product": "aardvark-dns", "vendor": "containers", "versions": [{"status": "affected", "version": ">= 1.16.0, < 1.17.1"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:containers:aardvark-dns:*:*:*:*:*:*:*:*", "matchCriteriaId": "CD81C8DA-2E94-4EF0-AA53-E33BD76AAE26", "versionEndExcluding": "1.17.1", "versionStartIncluding": "1.16.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}, {"lang": "es", "value": "Aardvark-dns es un servidor DNS autoritativo para registros de contenedor A/AAAA. Desde 1.16.0 hasta 1.17.0, una consulta DNS TCP truncada seguida de un reinicio de conexi\u00f3n provoca que aardvark-dns entre en un bucle de error infinito irrecuperable al 100% de CPU. Esta vulnerabilidad est\u00e1 corregida en 1.17.1."}], "id": "CVE-2026-35406", "lastModified": "2026-07-24T21:10:00.143", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 6.2, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.5, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-35406", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-04-08T16:09:52.961124Z", "version": "2.0.3"}}]}, "published": "2026-04-07T22:16:23.277", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/containers/aardvark-dns/commit/3b49ea7b38bdea134b7f03256f2e13f44ce73bb1"}, {"source": "security-advisories@github.com", "tags": ["Release Notes"], "url": "https://github.com/containers/aardvark-dns/releases/tag/v1.17.1"}, {"source": "security-advisories@github.com", "tags": ["Patch", "Vendor Advisory"], "url": "https://github.com/containers/aardvark-dns/security/advisories/GHSA-hfpq-x728-986j"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-400"}], "source": "security-advisories@github.com", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-835"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "aardvark-dns: Aardvark-dns: Denial of Service due to malformed TCP DNS queries", "id": "2456280", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2456280"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-835", "details": ["A flaw was found in aardvark-dns, an authoritative DNS server for container records. A remote attacker can exploit this vulnerability by sending a truncated Transmission Control Protocol (TCP) DNS query followed by a connection reset. This action causes aardvark-dns to enter an unrecoverable infinite error loop, consuming 100% of the CPU and leading to a Denial of Service (DoS)."], "mitigation": {"lang": "en:us", "value": "To mitigate this issue, restrict network access to the aardvark-dns service to only trusted clients and networks. Configure firewall rules to limit incoming TCP DNS queries to the necessary interfaces and IP ranges. If aardvark-dns is not required to be publicly accessible, consider binding it to localhost or a private network interface. After applying firewall rules, ensure the aardvark-dns service is reloaded or restarted for the changes to take effect. This may temporarily interrupt DNS resolution provided by aardvark-dns."}, "name": "CVE-2026-35406", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "aardvark-dns", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "container-tools:rhel8/aardvark-dns", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "container-tools:rhel8/containers-common", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "aardvark-dns", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "rhcos", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-04-07T21:32:23Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-35406\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-35406\nhttps://github.com/containers/aardvark-dns/commit/3b49ea7b38bdea134b7f03256f2e13f44ce73bb1\nhttps://github.com/containers/aardvark-dns/releases/tag/v1.17.1\nhttps://github.com/containers/aardvark-dns/security/advisories/GHSA-hfpq-x728-986j"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[1.16.0,1.17.1)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "aardvark-dns", "source": "cna", "vendor": "containers"}, "product": "aardvark-dns", "vendor": "containers"}], "analysis": {"en": {"generated_at": "2026-04-08T13:51:21.296698+00:00", "value": {"mitigation_remediation": ["Upgrade aardvark-dns to version 1.17.1 or later"], "summary": {"action": "Immediate Patch", "impact": "Denial of Service via CPU exhaustion"}, "threat_synthesis": {"affected_systems": "Any instance of the Containers project\u2019s aardvark-dns container image labeled containers:aardvark-dns running a version between 1.16.0 and 1.17.0 inclusive is vulnerable. Operators should verify the image tag in use and ensure it is not one of these versions.", "description_and_impact": "Aardvark-dns, an authoritative DNS server for container-hosted A/AAAA records, can enter an unrecoverable infinite error loop that consumes 100\u202f% CPU when it receives a truncated TCP DNS query followed by a connection reset. This defect threatens availability by preventing the server from processing legitimate requests until a restart or manual intervention resumes service. The weakness stems from improper error handling (CWE\u2011400) and missing loop termination (CWE\u2011835).", "risk_and_exploitability": "The CVSS score of 6.2 indicates moderate severity, and the EPSS score is unavailable. The vulnerability is not listed in the CISA KEV catalog. The likely attack vector is a remote client sending a malformed TCP DNS packet, which does not require local privileges. Repeated delivery of such packets can repeatedly trigger the infinite loop, exhausting CPU resources and causing a denial of service until the container is restarted or the software upgraded."}}}}, "created": "2026-04-08T19:34:02.703562+00:00", "updated": "2026-04-08T19:45:29.076182+00:00", "vendors": ["containers", "containers$PRODUCT$aardvark-dns"]}