{"id":"CVE-2026-69184","summary":"c-ares: CPU-exhaustion denial of service via unbounded DNS name compression pointer chains","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.","aliases":["GHSA-pjmc-gx33-gc76"],"modified":"2026-09-19T03:47:28.228264714Z","published":"2026-09-18T17:26:52.210Z","related":["SUSE-SU-2026:23364-1","SUSE-SU-2026:23414-1","SUSE-SU-2026:3872-1","SUSE-SU-2026:4021-1","openSUSE-SU-2026:11593-1","openSUSE-SU-2026:21721-1"],"database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-407"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/69xxx/CVE-2026-69184.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/69xxx/CVE-2026-69184.json"},{"type":"FIX","url":"https://github.com/c-ares/c-ares/commit/5c8341ba6ff3a8e4e4dfd616f8ed0418838b8b7b"},{"type":"FIX","url":"https://github.com/c-ares/c-ares/commit/f1288bbc70e9a1e0a77134c2382157e52d326aea"},{"type":"FIX","url":"https://github.com/c-ares/c-ares/pull/1164"},{"type":"FIX","url":"https://github.com/c-ares/c-ares/pull/1210"},{"type":"WEB","url":"https://github.com/c-ares/c-ares/releases/tag/v1.34.7"},{"type":"ADVISORY","url":"https://github.com/c-ares/c-ares/security/advisories/GHSA-pjmc-gx33-gc76"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-69184"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/c-ares/c-ares","events":[{"introduced":"0"},{"fixed":"d63b7de3a3568d14ab1351374b205365aed51cca"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"1.34.7"}],"source":"AFFECTED_FIELD"}}],"versions":["v1.34.6","v1.34.5","v1.34.4","v1.34.3","v1.34.2","v1.34.1","v1.34.0","v1.31.0","cares-1_29_0","cares-1_28_1","cares-1_28_0","cares-1_27_0","cares-1_26_0","cares-1_25_0","cares-1_24_0","cares-1_23_0","cares-1_22_1","cares-1_22_0","cares-1_21_0","cares-1_20_1","cares-1_20_0","cares-1_19_1","cares-1_19_0","cares-1_18_1","cares-1_18_0","cares-1_17_2","cares-1_17_1","c-ares-1_17_0","cares-1_16_1","cares-1_16_0","cares-1_15_0","cares-1_14_0","cares-1_13_0","cares-1_12_0","cares-1_11_0","cares-1_11_0-rc1","cares-1_10_0","cares-1_9_1","cares-1_9_0","cares-1_8_0","cares-1_7_5","cares-1_7_4","cares-1_7_3","cares-1_7_2","cares-1_7_1","curl-7_20_0","cares-1_7_0","curl-7_19_7","curl-7_19_6","curl-7_19_5","curl-7_19_4","curl-7_19_3","cares-1_6_0","curl-7_19_2","curl-7_19_0","cares-1_5_3","curl-7_18_2","cares-1_5_2","curl-7_18_1","curl-7_18_0","cares-1_5_1","cares-1_5_0","curl-7_17_1","curl-7_17_0","curl-7_16_4","curl-7_16_3","cares-1_4_0","curl-7_16_2","curl-7_16_1","cares-1_3_2","curl-7_16_0","curl-7_15_6-prepipeline","curl-7_15_5","cares-1_3_1","curl-7_15_4","curl-7_15_3","curl-7_15_1","curl-7_15_0","curl-7_14_1","curl-7_14_0","curl-7_13_2","curl-7_13_1","curl-7_13_0","cares-1_2_1","curl-7_12_2","curl-7_12_1","curl-7_12_0","c-ares-1_2_0","curl-7_11_1","cares-1_1_0","curl-7_11_0","curl-7_10_8"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-69184.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}