CVE-2026-69184

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{"affected": [{"affectedData": [{"product": "c-ares", "vendor": "c-ares", "versions": [{"status": "affected", "version": "< 1.34.7"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "c-ares is an asynchronous resolver library. Prior to 1.34.7, ares_dns_name_parse() enforces backward DNS compression pointers but does not bound the total pointer hops or assembled name length. A malicious DNS server can send a response containing a long descending pointer chain and many resource records whose NAME or RDATA fields refer to the chain, causing repeated decompression work that grows quadratically with message size. A single crafted response can stall the single-threaded c-ares event loop and deny DNS resolution, without causing memory corruption or information disclosure. This issue is fixed in version 1.34.7."}], "id": "CVE-2026-69184", "lastModified": "2026-09-24T21:16:28.120", "metrics": {"cvssMetricV31": [{"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": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-69184", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-09-18T20:13:18.897117Z", "version": "2.0.3"}}]}, "published": "2026-09-18T18:17:11.477", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/c-ares/c-ares/commit/5c8341ba6ff3a8e4e4dfd616f8ed0418838b8b7b"}, {"source": "security-advisories@github.com", "url": "https://github.com/c-ares/c-ares/commit/f1288bbc70e9a1e0a77134c2382157e52d326aea"}, {"source": "security-advisories@github.com", "url": "https://github.com/c-ares/c-ares/pull/1164"}, {"source": "security-advisories@github.com", "url": "https://github.com/c-ares/c-ares/pull/1210"}, {"source": "security-advisories@github.com", "url": "https://github.com/c-ares/c-ares/releases/tag/v1.34.7"}, {"source": "security-advisories@github.com", "url": "https://github.com/c-ares/c-ares/security/advisories/GHSA-pjmc-gx33-gc76"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-407"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"bugzilla": {"description": "c-ares: c-ares: CPU exhaustion denial of service via unbounded DNS name compression pointer chains", "id": "2538396", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2538396"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-770", "details": ["c-ares is an asynchronous resolver library. Prior to 1.34.7, ares_dns_name_parse() enforces backward DNS compression pointers but does not bound the total pointer hops or assembled name length. A malicious DNS server can send a response containing a long descending pointer chain and many resource records whose NAME or RDATA fields refer to the chain, causing repeated decompression work that grows quadratically with message size. A single crafted response can stall the single-threaded c-ares event loop and deny DNS resolution, without causing memory corruption or information disclosure. This issue is fixed in version 1.34.7.", "A flaw was found in c-ares, an asynchronous resolver library. The 'ares_dns_name_parse()' function does not properly limit the total pointer hops or assembled name length when enforcing backward DNS compression pointers. A remote attacker, operating a malicious DNS server, can send a specially crafted DNS response containing a long descending pointer chain. This can lead to excessive CPU consumption, causing the single-threaded c-ares event loop to stall and resulting in a denial of service for DNS resolution."], "name": "CVE-2026-69184", "package_state": [{"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-09-18T17:26:52Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-69184\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-69184\nhttps://github.com/c-ares/c-ares/commit/5c8341ba6ff3a8e4e4dfd616f8ed0418838b8b7b\nhttps://github.com/c-ares/c-ares/commit/f1288bbc70e9a1e0a77134c2382157e52d326aea\nhttps://github.com/c-ares/c-ares/pull/1164\nhttps://github.com/c-ares/c-ares/pull/1210\nhttps://github.com/c-ares/c-ares/releases/tag/v1.34.7\nhttps://github.com/c-ares/c-ares/security/advisories/GHSA-pjmc-gx33-gc76"], "threat_severity": "Important"}

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