{"id":"CVE-2026-69184","published":"2026-09-18T18:17:11.477","lastModified":"2026-09-24T21:16:28.120","description":"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.","cvssScore":7.5,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwes":["CWE-407"],"vendors":[],"products":[],"references":[{"url":"https://github.com/c-ares/c-ares/commit/5c8341ba6ff3a8e4e4dfd616f8ed0418838b8b7b","tags":[]},{"url":"https://github.com/c-ares/c-ares/commit/f1288bbc70e9a1e0a77134c2382157e52d326aea","tags":[]},{"url":"https://github.com/c-ares/c-ares/pull/1164","tags":[]},{"url":"https://github.com/c-ares/c-ares/pull/1210","tags":[]},{"url":"https://github.com/c-ares/c-ares/releases/tag/v1.34.7","tags":[]},{"url":"https://github.com/c-ares/c-ares/security/advisories/GHSA-pjmc-gx33-gc76","tags":[]}],"exploitRefs":[{"url":"https://github.com/c-ares/c-ares/commit/5c8341ba6ff3a8e4e4dfd616f8ed0418838b8b7b","tags":[]},{"url":"https://github.com/c-ares/c-ares/commit/f1288bbc70e9a1e0a77134c2382157e52d326aea","tags":[]},{"url":"https://github.com/c-ares/c-ares/pull/1164","tags":[]},{"url":"https://github.com/c-ares/c-ares/pull/1210","tags":[]},{"url":"https://github.com/c-ares/c-ares/releases/tag/v1.34.7","tags":[]},{"url":"https://github.com/c-ares/c-ares/security/advisories/GHSA-pjmc-gx33-gc76","tags":[]}],"hasPoc":true,"ai":null}