High
Security advisory
client_side.cc in Squid before 3.5.18 and 4.x before 4.0.10 does not properly ignore the Host header when absolute-URI is provided, which allows remote attackers to conduct cache-poisoning attacks via an HTTP request.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2016-4553
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 06:03 UTC · Revision 1
Source evidence
client_side.cc in Squid before 3.5.18 and 4.x before 4.0.10 does not properly ignore the Host header when absolute-URI is provided, which allows remote attackers to conduct cache-poisoning attacks via an HTTP request.
osv:CVE-2016-4553
Complete source record
{
"id": "9c80bac75dbeb3310ac6c6546d34675981af922dfe447388a5b1ba6a3660ba7e",
"url": "https://osv.dev/vulnerability/CVE-2016-4553",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2016-4553",
"summary": "client_side.cc in Squid before 3.5.18 and 4.x before 4.0.10 does not properly ignore the Host header when absolute-URI is provided, which allows remote attackers to conduct cache-poisoning attacks via an HTTP request.",
"evidence": "osv:CVE-2016-4553",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2016-4553",
"aliases": [
"CVE-2016-4553"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/squid-cache/squid",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"last_affected": "0a4efb98f1e84bb7392c7ecc9c7deb0381458b0f"
},
{
"introduced": "1243ec712bf76c549ba7f48fcdc30d98ce550449"
},
{
"last_affected": "15fb77e4092a910ea4abe83594a1ac9f79cae333"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:squid-cache:squid:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"last_affected": "3.5.17"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:squid-cache:squid:4.0.1:*:*:*:*:*:*:*",
"range": [
{
"introduced": "4.0.1"
},
{
"last_affected": "4.0.1"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:squid-cache:squid:4.0.2:*:*:*:*:*:*:*",
"range": [
{
"introduced": "4.0.2"
},
{
"last_affected": "4.0.2"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:squid-cache:squid:4.0.3:*:*:*:*:*:*:*",
"range": [
{
"introduced": "4.0.3"
},
{
"last_affected": "4.0.3"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:squid-cache:squid:4.0.4:*:*:*:*:*:*:*",
"range": [
{
"introduced": "4.0.4"
},
{
"last_affected": "4.0.4"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:squid-cache:squid:4.0.5:*:*:*:*:*:*:*",
"range": [
{
"introduced": "4.0.5"
},
{
"last_affected": "4.0.5"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:squid-cache:squid:4.0.6:*:*:*:*:*:*:*",
"range": [
{
"introduced": "4.0.6"
},
{
"last_affected": "4.0.6"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:squid-cache:squid:4.0.7:*:*:*:*:*:*:*",
"range": [
{
"introduced": "4.0.7"
},
{
"last_affected": "4.0.7"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:squid-cache:squid:4.0.8:*:*:*:*:*:*:*",
"range": [
{
"introduced": "4.0.8"
},
{
"last_affected": "4.0.8"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:squid-cache:squid:4.0.9:*:*:*:*:*:*:*",
"range": [
{
"introduced": "4.0.9"
},
{
"last_affected": "4.0.9"
}
],
"source": "CPE_STRING"
}
]
}
}
],
"versions": [
"4.0.1",
"4.0.2",
"4.0.3",
"4.0.4",
"4.0.5",
"4.0.6",
"4.0.7",
"4.0.8",
"4.0.9",
"SQUID_3_5_17",
"SQUID_4_0_9",
"SQUID_3_5_16",
"SQUID_4_0_8",
"SQUID_3_5_15",
"SQUID_4_0_7",
"SQUID_3_5_14",
"SQUID_4_0_6",
"SQUID_4_0_5",
"SQUID_3_5_13",
"SQUID_4_0_4",
"SQUID_3_5_12",
"SQUID_4_0_3",
"SQUID_3_5_11",
"SQUID_4_0_2",
"SQUID_4_0_1",
"SQUID_3_5_10",
"SQUID_3_5_9",
"SQUID_3_5_8",
"SQUID_3_5_7",
"SQUID_3_5_6",
"SQUID_3_5_5",
"SQUID_3_5_4",
"SQUID_3_5_3",
"SQUID_3_5_2",
"SQUID_3_5_1",
"SQUID_3_5_0_4",
"SQUID_3_5_0_3",
"SQUID_3_5_0_2",
"SQUID_3_5_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": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2016-4553.json"
}
}
],
"modified": "2026-10-24T10:30:34.733476334Z",
"provider": "osv",
"references": [
"https://access.redhat.com/errata/RHSA-2016:1139",
"https://access.redhat.com/errata/RHSA-2016:1140",
"https://security.gentoo.org/glsa/201607-01"
],
"provider_metadata": {
"unresolved_ranges": [
{
"cpes": [
"cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:lts:*:*:*",
"cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*",
"cpe:2.3:o:canonical:ubuntu_linux:15.10:*:*:*:*:*:*:*",
"cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*"
],
"vendor_product": "canonical:ubuntu_linux",
"extracted_events": [
{
"range": [
{
"introduced": "12.04"
},
{
"last_affected": "12.04"
},
{
"introduced": "14.04"
},
{
"last_affected": "14.04"
},
{
"introduced": "15.10"
},
{
"last_affected": "15.10"
},
{
"introduced": "16.04"
},
{
"last_affected": "16.04"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:oracle:linux:7:*:*:*:*:*:*:*"
],
"vendor_product": "oracle:linux",
"extracted_events": [
{
"range": [
{
"introduced": "7"
},
{
"last_affected": "7"
}
],
"source": "CPE_STRING"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2016-4553",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 433602,
"published_at": "2016-05-10T19:59:00.137+00:00"
}