{"id":"CVE-2026-69184","title":"c-ares is an asynchronous resolver library","summary":"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 …","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-407"],"vendor":"c-ares","product":"c-ares","affected":["c-ares < 1.34.7"],"published":"2026-09-18","updated":"2026-09-21","sourceUpdated":"2026-09-21T21:17:08.950","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-69184","references":[{"url":"https://github.com/c-ares/c-ares/commit/5c8341ba6ff3a8e4e4dfd616f8ed0418838b8b7b","label":"security-advisories@github.com"},{"url":"https://github.com/c-ares/c-ares/commit/f1288bbc70e9a1e0a77134c2382157e52d326aea","label":"security-advisories@github.com"},{"url":"https://github.com/c-ares/c-ares/pull/1164","label":"security-advisories@github.com"},{"url":"https://github.com/c-ares/c-ares/pull/1210","label":"security-advisories@github.com"},{"url":"https://github.com/c-ares/c-ares/releases/tag/v1.34.7","label":"security-advisories@github.com"},{"url":"https://github.com/c-ares/c-ares/security/advisories/GHSA-pjmc-gx33-gc76","label":"security-advisories@github.com"}],"tags":["nvd","cve.org"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-09-18T20:13:18.897117Z"},"epss":0.00675,"epssPercentile":0.50386,"ingestedAt":"2026-09-18T17:46:41.539Z","slug":"CVE-2026-69184","body":"## Overview\n\nc-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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}