{"id":"AZL-103307","summary":"CVE-2026-69184 affecting package c-ares 1.30.0-2","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.","modified":"2026-09-20T05:33:47Z","published":"2026-09-18T18:17:11Z","upstream":["CVE-2026-69184"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-69184"}],"affected":[{"package":{"name":"c-ares","ecosystem":"Azure Linux:3","purl":"pkg:rpm/azure-linux/c-ares"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"1.30.0-2"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-103307.json"}}],"schema_version":"1.9.0"}