{"id":"CVE-2026-32748","summary":"Squid has Denial of Service in ICP Response handling","details":"Squid is a caching proxy for the Web. Prior to version 7.5, due to premature release of resource during expected lifetime and heap Use-After-Free bugs, Squid is vulnerable to Denial of Service when handling ICP traffic. This problem allows a remote attacker to perform a reliable and repeatable Denial of Service attack against the Squid service using ICP protocol. This attack is limited to Squid deployments that explicitly enable ICP support (i.e. configure non-zero `icp_port`). This problem _cannot_ be mitigated by denying ICP queries using `icp_access` rules. This bug is fixed in Squid version 7.5.","aliases":["GHSA-f9p7-3jqg-hhvq"],"modified":"2026-08-12T15:32:24.363983Z","published":"2026-03-26T00:11:01.424Z","related":["ALSA-2026:6301","ALSA-2026:8119","ALSA-2026:8317"],"database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-413","CWE-416","CWE-826"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/32xxx/CVE-2026-32748.json"},"references":[{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2026/03/25/3"},{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-32748.json"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:10255"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:10256"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:10257"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:11901"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:20564"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:20565"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:20580"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:6301"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:8119"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:8317"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:8880"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:9220"},{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2026-32748"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/32xxx/CVE-2026-32748.json"},{"type":"ADVISORY","url":"https://github.com/squid-cache/squid/security/advisories/GHSA-f9p7-3jqg-hhvq"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-32748"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2451577"},{"type":"FIX","url":"https://github.com/squid-cache/squid/commit/703e07d25ca6fa11f52d20bf0bb879e22ab7481b"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/squid-cache/squid","events":[{"introduced":"0"},{"fixed":"2e58fa81c730f29f6ec52ef8bd056e658e01d50c"},{"fixed":"703e07d25ca6fa11f52d20bf0bb879e22ab7481b"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"7.5"}],"source":["CPE_RANGE","REFERENCES"],"cpe":"cpe:2.3:a:squid-cache:squid:*:*:*:*:*:*:*:*"}}],"versions":["SQUID_7_4","SQUID_7_3","SQUID_7_2","SQUID_7_1","SQUID_7_0_2","SQUID_7_0_1","6.0.0-20210527-master-snapshot","5.0.6-20210527-snapshot","4.15-20210527-snapshot","6.0.0-20210525-master-snapshot","5.0.6-20210525-snapshot","4.15-20210525-snapshot","6.0.0-20210524-master-snapshot","6.0.0-20210523-master-snapshot","6.0.0-20210522-master-snapshot","5.0.6-20210524-snapshot","5.0.6-20210523-snapshot","5.0.6-20210522-snapshot","4.15-20210524-snapshot","4.15-20210523-snapshot","4.15-20210522-snapshot","M-staged-PR365","M-staged-PR370","M-staged-PR376","M-staged-PR375","M-staged-PR373","M-staged-PR372","M-staged-PR319","M-staged-PR366","M-staged-PR351","M-staged-PR342","M-staged-PR364","M-staged-PR359","M-staged-PR348","M-staged-PR345","M-staged-PR314","M-staged-PR306","M-staged-PR294","M-staged-PR299","M-staged-PR295","M-staged-PR293","M-staged-PR164","M-staged-PR276","M-staged-PR274","SQUID_3_5_27","M-staged-PR264","M-staged-PR268","M-staged-PR267","M-staged-PR266","M-staged-PR258","M-staged-PR230","M-staged-PR255","M-staged-PR252","M-staged-PR229","M-staged-PR241","M-staged-PR239","M-staged-PR242","M-staged-PR235","M-staged-PR238","M-staged-PR218","M-staged-PR237","M-staged-PR227","M-staged-PR202","M-staged-PR225","M-staged-PR220","M-staged-PR221","M-staged-PR210","M-staged-PR209","M-staged-PR208","M-staged-PR198","M-staged-PR206","M-staged-PR182","M-staged-PR195","M-staged-PR199","M-staged-PR200","M-staged-PR196","M-staged-PR193","M-staged-PR181","M-staged-PR189","M-staged-PR176","M-staged-PR186","M-staged-PR179","M-staged-PR170","M-staged-PR161","SQUID_4_0_16","SQUID_4_0_15","SQUID_4_0_14","SQUID_4_0_13","SQUID_4_0_12","SQUID_4_0_11","SQUID_4_0_10","SQUID_4_0_9","SQUID_4_0_8","SQUID_4_0_7","SQUID_4_0_6","SQUID_4_0_5","SQUID_4_0_4","SQUID_4_0_3","SQUID_4_0_2","SQUID_4_0_1","take00","SQUID_3_0_RC1","SQUID_3_0_PRE7","SQUID_3_0_PRE6","SQUID_3_0_PRE5","SQUID_3_0_PRE4","SQUID_3_0_PRE3","SQUID_3_0_PRE2","SQUID_3_0_PRE1","HISTORIC_RELEASES"],"database_specific":{"vanir_signatures_modified":"2026-08-12T15:32:24Z","vanir_signatures":[{"deprecated":false,"digest":{"line_hashes":["243352462900800681241861553990203413808","300484473802938881708248863686584403596","94192046996803733410238991015010850766","35976842455265214243543065521283426545","229907641640078050589270929510956296299","172167082737990101058666970536840061876","163641930995999705390020501624719436738","317453058515531118909598510072130818949","327947400352631882207840664111419143550","293001272136621056586609424205657683755","18038119063448128555331543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