{"id":"CVE-2019-18676","details":"An issue was discovered in Squid 3.x and 4.x through 4.8. Due to incorrect input validation, there is a heap-based buffer overflow that can result in Denial of Service to all clients using the proxy. Severity is high due to this vulnerability occurring before normal security checks; any remote client that can reach the proxy port can trivially perform the attack via a crafted URI scheme.","modified":"2026-04-02T01:45:30.376001Z","published":"2019-11-26T17:15:12.843Z","related":["ALSA-2020:4743","MGASA-2019-0382","SUSE-SU-2019:2975-1","SUSE-SU-2019:3067-1","SUSE-SU-2020:0661-1","SUSE-SU-2020:14460-1","SUSE-SU-2022:14908-1","openSUSE-SU-2019:2540-1","openSUSE-SU-2019:2541-1"],"references":[{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MTM74TU2BSLT5B3H4F3UDW53672NVLMC/"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UEMOYTMCCFWK5NOXSXEIH5D2VGWVXR67/"},{"type":"ADVISORY","url":"https://lists.debian.org/debian-lts-announce/2020/07/msg00009.html"},{"type":"ADVISORY","url":"https://usn.ubuntu.com/4213-1/"},{"type":"ADVISORY","url":"https://usn.ubuntu.com/4446-1/"},{"type":"ADVISORY","url":"https://www.debian.org/security/2020/dsa-4682"},{"type":"ADVISORY","url":"http://www.squid-cache.org/Advisories/SQUID-2019_8.txt"},{"type":"REPORT","url":"https://bugzilla.suse.com/show_bug.cgi?id=1156329"},{"type":"FIX","url":"https://github.com/squid-cache/squid/pull/275"},{"type":"FIX","url":"http://www.squid-cache.org/Versions/v4/changesets/squid-4-fbbdf75efd7a5cc244b4886a9d42ea458c5a3a73.patch"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/squid-cache/squid","events":[{"introduced":"0"},{"last_affected":"6cfeb300caf423ff49a0511d8bd43a56f3418273"},{"introduced":"0"},{"last_affected":"fede82b3e7aa1f12a91bade17f6ac0d4c7463e0a"}],"database_specific":{"versions":[{"introduced":"3.0"},{"last_affected":"3.5.28"},{"introduced":"4.0"},{"last_affected":"4.8"}]}}],"versions":["4.15-20210522-snapshot","4.15-20210523-snapshot","4.15-20210524-snapshot","4.15-20210525-snapshot","4.15-20210527-snapshot","5.0.6-20210522-snapshot","5.0.6-20210523-snapshot","5.0.6-20210524-snapshot","5.0.6-20210525-snapshot","5.0.6-20210527-snapshot","6.0.0-20210522-master-snapshot","6.0.0-20210523-master-snapshot","6.0.0-20210524-master-snapshot","6.0.0-20210525-master-snapshot","6.0.0-20210527-master-snapshot","BASIC_TPROXY4","BumpSslServerFirst.take01","BumpSslServerFirst.take02","BumpSslServerFirst.take03","BumpSslServerFirst.take04","BumpSslServerFirst.take05","BumpSslServerFirst.take06","BumpSslServerFirst.take07","BumpSslServerFirst.take08","BumpSslServerFirst.take09","BumpSslServerFirst.take10","HISTORIC_RELEASES","M-staged-PR151","M-staged-PR161","M-staged-PR164","M-staged-PR170","M-staged-PR175","M-staged-PR176","M-staged-PR177","M-staged-PR179","M-staged-PR181","M-staged-PR182","M-staged-PR183","M-staged-PR186","M-staged-PR187","M-staged-PR189","M-staged-PR193","M-staged-PR195","M-staged-PR196","M-staged-PR198","M-staged-PR199","M-staged-PR200","M-staged-PR202","M-staged-PR206","M-staged-PR208","M-staged-PR209","M-staged-PR210","M-staged-PR211","M-staged-PR213","M-staged-PR218","M-staged-PR220","M-staged-PR221","M-staged-PR223","M-staged-PR225","M-staged-PR227","M-staged-PR228","M-staged-PR229","M-staged-PR230","M-staged-PR231","M-staged-PR232","M-staged-PR235","M-staged-PR237","M-staged-PR238","M-staged-PR239","M-staged-PR241","M-staged-PR242","M-staged-PR243","M-staged-PR252","M-staged-PR255","M-staged-PR258","M-staged-PR264","M-staged-PR266","M-staged-PR267","M-staged-PR268","M-staged-PR273","M-staged-PR274","M-staged-PR276","M-staged-PR281","M-staged-PR282","M-staged-PR285","M-staged-PR287","M-staged-PR288","M-staged-PR293","M-staged-PR294","M-staged-PR295","M-staged-PR299","M-staged-PR304","M-staged-PR306","M-staged-PR307","M-staged-PR310","M-staged-PR311","M-staged-PR314","M-staged-PR319","M-staged-PR324","M-staged-PR330","M-staged-PR342","M-staged-PR345","M-staged-PR347","M-staged-PR348","M-staged-PR351","M-staged-PR356","M-staged-PR357","M-staged-PR359","M-staged-PR362","M-staged-PR364","M-staged-PR365","M-staged-PR366","M-staged-PR370","M-staged-PR372","M-staged-PR373","M-staged-PR375","M-staged-PR376","M-staged-PR379","M-staged-PR59","M-staged-PR71","SQUID_3_0_PRE1","SQUID_3_0_PRE2","SQUID_3_0_PRE3","SQUID_3_0_PRE4","SQUID_3_0_PRE5","SQUID_3_0_PRE6","SQUID_3_0_PRE7","SQUID_3_0_RC1","SQUID_3_0_STABLE1","SQUID_3_0_STABLE10","SQUID_3_0_STABLE11","SQUID_3_0_STABLE11_RC1","SQUID_3_0_STABLE12","SQUID_3_0_STABLE13","SQUID_3_0_STABLE14","SQUID_3_0_STABLE15","SQUID_3_0_STABLE16","SQUID_3_0_STABLE16_RC1","SQUID_3_0_STABLE17","SQUID_3_0_STABLE18","SQUID_3_0_STABLE19","SQUID_3_0_STABLE2","SQUID_3_0_STABLE20","SQUID_3_0_STABLE21","SQUID_3_0_STABLE22","SQUID_3_0_STABLE23","SQUID_3_0_STABLE24","SQUID_3_0_STABLE25","SQUID_3_0_STABLE26","SQUID_3_0_STABLE3","SQUID_3_0_STABLE4","SQUID_3_0_STABLE5","SQUID_3_0_STABLE6","SQUID_3_0_STABLE7","SQUID_3_0_STABLE8","SQUID_3_0_STABLE9","SQUID_3_1_0_1","SQUID_3_1_0_10","SQUID_3_1_0_11","SQUID_3_1_0_12","SQUID_3_1_0_13","SQUID_3_1_0_14","SQUID_3_1_0_15","SQUID_3_1_0_16","SQUID_3_1_0_17","SQUID_3_1_0_18","SQUID_3_1_0_2","SQUID_3_1_0_3","SQUID_3_1_0_4","SQUID_3_1_0_5","SQUID_3_1_0_6","SQUID_3_1_0_7","SQUID_3_1_0_8","SQUID_3_1_0_9","SQUID_3_1_1","SQUID_3_1_10","SQUID_3_1_11","SQUID_3_1_12","SQUID_3_1_12_1","SQUID_3_1_12_2","SQUID_3_1_12_3","SQUID_3_1_13","SQUID_3_1_14","SQUID_3_1_15","SQUID_3_1_16","SQUID_3_1_17","SQUID_3_1_18","SQUID_3_1_19","SQUID_3_1_2","SQUID_3_1_20","SQUID_3_1_21","SQUID_3_1_22","SQUID_3_1_23","SQUID_3_1_3","SQUID_3_1_4","SQUID_3_1_5","SQUID_3_1_5_1","SQUID_3_1_6","SQUID_3_1_7","SQUID_3_1_8","SQUID_3_1_9","SQUID_3_2_0_1","SQUID_3_2_0_10","SQUID_3_2_0_11","SQUID_3_2_0_12","SQUID_3_2_0_13","SQUID_3_2_0_14","SQUID_3_2_0_15","SQUID_3_2_0_16","SQUID_3_2_0_17","SQUID_3_2_0_18","SQUID_3_2_0_19","SQUID_3_2_0_2","SQUID_3_2_0_3","SQUID_3_2_0_4","SQUID_3_2_0_5","SQUID_3_2_0_6","SQUID_3_2_0_7","SQUID_3_2_0_8","SQUID_3_2_0_9","SQUID_3_2_1","SQUID_3_2_10","SQUID_3_2_11","SQUID_3_2_12","SQUID_3_2_13","SQUID_3_2_14","SQUID_3_2_2","SQUID_3_2_3","SQUID_3_2_4","SQUID_3_2_5","SQUID_3_2_6","SQUID_3_2_7","SQUID_3_2_8","SQUID_3_2_9","SQUID_3_3_0_1","SQUID_3_3_0_2","SQUID_3_3_0_3","SQUID_3_3_1","SQUID_3_3_10","SQUID_3_3_11","SQUID_3_3_12","SQUID_3_3_13","SQUID_3_3_14","SQUID_3_3_2","SQUID_3_3_3","SQUID_3_3_4","SQUID_3_3_5","SQUID_3_3_6","SQUID_3_3_7","SQUID_3_3_8","SQUID_3_3_9","SQUID_3_4_0_1","SQUID_3_4_0_2","SQUID_3_4_0_3","SQUID_3_4_1","SQUID_3_4_10","SQUID_3_4_11","SQUID_3_4_12","SQUID_3_4_13","SQUID_3_4_14","SQUID_3_4_2","SQUID_3_4_3","SQUID_3_4_4","SQUID_3_4_4_1","SQUID_3_4_4_2","SQUID_3_4_5","SQUID_3_4_6","SQUID_3_4_7","SQUID_3_4_8","SQUID_3_4_9","SQUID_3_5_0_1","SQUID_3_5_0_2","SQUID_3_5_0_3","SQUID_3_5_0_4","SQUID_3_5_1","SQUID_3_5_10","SQUID_3_5_11","SQUID_3_5_12","SQUID_3_5_13","SQUID_3_5_14","SQUID_3_5_15","SQUID_3_5_16","SQUID_3_5_17","SQUID_3_5_18","SQUID_3_5_19","SQUID_3_5_2","SQUID_3_5_20","SQUID_3_5_21","SQUID_3_5_22","SQUID_3_5_23","SQUID_3_5_24","SQUID_3_5_25","SQUID_3_5_26","SQUID_3_5_27","SQUID_3_5_28","SQUID_3_5_3","SQUID_3_5_4","SQUID_3_5_5","SQUID_3_5_6","SQUID_3_5_7","SQUID_3_5_8","SQUID_3_5_9","SQUID_4_0_1","SQUID_4_0_10","SQUID_4_0_11","SQUID_4_0_12","SQUID_4_0_13","SQUID_4_0_14","SQUID_4_0_15","SQUID_4_0_16","SQUID_4_0_17","SQUID_4_0_18","SQUID_4_0_19","SQUID_4_0_2","SQUID_4_0_20","SQUID_4_0_21","SQUID_4_0_22","SQUID_4_0_23","SQUID_4_0_24","SQUID_4_0_25","SQUID_4_0_3","SQUID_4_0_4","SQUID_4_0_5","SQUID_4_0_6","SQUID_4_0_7","SQUID_4_0_8","SQUID_4_0_9","SQUID_4_1","SQUID_4_2","SQUID_4_3","SQUID_4_4","SQUID_4_5","SQUID_4_6","SQUID_4_7","SQUID_4_8","SQUID_5_0_1","SQUID_5_0_2","SQUID_5_0_3","SQUID_5_0_4","SQUID_5_0_5","SQUID_5_0_6","SQUID_5_0_7","SQUID_5_1","SQUID_5_2","SQUID_5_3","SQUID_5_4","SQUID_5_4_1","SQUID_5_5","SQUID_5_6","SQUID_5_7","SQUID_5_8","SQUID_5_9","SQUID_6_0_1","SQUID_6_0_2","SQUID_6_0_3","SQUID_6_1","SQUID_6_10","SQUID_6_11","SQUID_6_12","SQUID_6_13","SQUID_6_14","SQUID_6_2","SQUID_6_3","SQUID_6_4","SQUID_6_5","SQUID_6_6","SQUID_6_7","SQUID_6_8","SQUID_6_9","SQUID_7_0_1","SQUID_7_0_2","SQUID_7_1","SQUID_7_2","SQUID_7_3","SQUID_7_4","SQUID_7_5","for-libecap-v0p1","merge-candidate-3-v1","merge-candidate-3-v2","sourceformat-review-1","take00","take01","take02","take03","take04","take06","take07","take08","take09","take1","take2"],"database_specific":{"unresolved_ranges":[{"events":[{"introduced":"0"},{"last_affected":"16.04"}]},{"events":[{"introduced":"0"},{"last_affected":"18.04"}]},{"events":[{"introduced":"0"},{"last_affected":"19.04"}]},{"events":[{"introduced":"0"},{"last_affected":"19.10"}]},{"events":[{"introduced":"0"},{"last_affected":"30"}]},{"events":[{"introduced":"0"},{"last_affected":"31"}]},{"events":[{"introduced":"0"},{"last_affected":"9.0"}]},{"events":[{"introduced":"0"},{"last_affected":"10.0"}]},{"events":[{"introduced":"0"},{"last_affected":"16.04"}]},{"events":[{"introduced":"0"},{"last_affected":"18.04"}]}],"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2019-18676.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}