High
Security advisory
Double free vulnerability in Esi.cc in Squid 3.x before 3.5.18 and 4.x before 4.0.10 allows remote servers to cause a denial of service (crash) via a crafted Edge Side Includes (ESI) response.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2016-4556
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 04:19 UTC · Revision 1
Source evidence
Double free vulnerability in Esi.cc in Squid 3.x before 3.5.18 and 4.x before 4.0.10 allows remote servers to cause a denial of service (crash) via a crafted Edge Side Includes (ESI) response.
osv:CVE-2016-4556
Complete source record
{
"id": "6189c9a5c469da80422e3213a3dc44e416cbdac3509d62653ab9cec7f6971341",
"url": "https://osv.dev/vulnerability/CVE-2016-4556",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2016-4556",
"summary": "Double free vulnerability in Esi.cc in Squid 3.x before 3.5.18 and 4.x before 4.0.10 allows remote servers to cause a denial of service (crash) via a crafted Edge Side Includes (ESI) response.",
"evidence": "osv:CVE-2016-4556",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2016-4556",
"aliases": [
"CVE-2016-4556"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/squid-cache/squid",
"type": "GIT",
"events": [
{
"introduced": "f188960023551b2e9cb2a9df245b92bfeef37056"
},
{
"last_affected": "15fb77e4092a910ea4abe83594a1ac9f79cae333"
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],
"database_specific": {
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{
"cpe": "cpe:2.3:a:squid-cache:squid:3.1:*:*:*:*:*:*:*",
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{
"introduced": "3.1"
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{
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{
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{
"cpe": "cpe:2.3:a:squid-cache:squid:3.1.0.2:*:*:*:*:*:*:*",
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{
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{
"cpe": "cpe:2.3:a:squid-cache:squid:3.1.0.3:*:*:*:*:*:*:*",
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{
"cpe": "cpe:2.3:a:squid-cache:squid:3.1.0.4:*:*:*:*:*:*:*",
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{
"cpe": "cpe:2.3:a:squid-cache:squid:3.1.0.5:*:*:*:*:*:*:*",
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{
"cpe": "cpe:2.3:a:squid-cache:squid:3.1.0.6:*:*:*:*:*:*:*",
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{
"cpe": "cpe:2.3:a:squid-cache:squid:3.1.0.7:*:*:*:*:*:*:*",
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{
"cpe": "cpe:2.3:a:squid-cache:squid:3.1.0.8:*:*:*:*:*:*:*",
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{
"cpe": "cpe:2.3:a:squid-cache:squid:3.1.0.9:*:*:*:*:*:*:*",
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{
"introduced": "3.1.0.9"
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{
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],
"source": "CPE_STRING"
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{
"cpe": "cpe:2.3:a:squid-cache:squid:3.1.0.10:*:*:*:*:*:*:*",
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"source": "CPE_STRING"
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{
"cpe": "cpe:2.3:a:squid-cache:squid:3.1.0.11:*:*:*:*:*:*:*",
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{
"cpe": "cpe:2.3:a:squid-cache:squid:3.1.0.12:*:*:*:*:*:*:*",
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"source": "CPE_STRING"
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{
"cpe": "cpe:2.3:a:squid-cache:squid:3.1.0.13:*:*:*:*:*:*:*",
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"cpe": "cpe:2.3:a:squid-cache:squid:3.1.0.14:*:*:*:*:*:*:*",
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"cpe": "cpe:2.3:a:squid-cache:squid:3.1.0.15:*:*:*:*:*:*:*",
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{
"cpe": "cpe:2.3:a:squid-cache:squid:3.1.0.16:*:*:*:*:*:*:*",
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"introduced": "3.1.0.16"
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{
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"source": "CPE_STRING"
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{
"cpe": "cpe:2.3:a:squid-cache:squid:3.1.0.17:*:*:*:*:*:*:*",
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{
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{
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"cpe": "cpe:2.3:a:squid-cache:squid:3.1.1:*:*:*:*:*:*:*",
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{
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{
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{
"cpe": "cpe:2.3:a:squid-cache:squid:3.1.2:*:*:*:*:*:*:*",
"range": [
{
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{
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{
"cpe": "cpe:2.3:a:squid-cache:squid:3.1.3:*:*:*:*:*:*:*",
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"cpe": "cpe:2.3:a:squid-cache:squid:3.1.4:*:*:*:*:*:*:*",
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{
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{
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],
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{
"cpe": "cpe:2.3:a:squid-cache:squid:3.1.5:*:*:*:*:*:*:*",
"range": [
{
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{
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],
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},
{
"cpe": "cpe:2.3:a:squid-cache:squid:3.1.5.1:*:*:*:*:*:*:*",
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{
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],
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},
{
"cpe": "cpe:2.3:a:squid-cache:squid:3.1.6:*:*:*:*:*:*:*",
"range": [
{
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{
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],
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},
{
"cpe": "cpe:2.3:a:squid-cache:squid:3.1.7:*:*:*:*:*:*:*",
"range": [
{
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{
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],
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{
"cpe": "cpe:2.3:a:squid-cache:squid:3.1.8:*:*:*:*:*:*:*",
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{
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{
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{
"cpe": "cpe:2.3:a:squid-cache:squid:3.1.15:*:*:*:*:*:*:*",
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{
"cpe": "cpe:2.3:a:squid-cache:squid:3.1.16:*:*:*:*:*:*:*",
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{
"cpe": "cpe:2.3:a:squid-cache:squid:3.1.17:*:*:*:*:*:*:*",
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{
"cpe": "cpe:2.3:a:squid-cache:squid:3.1.18:*:*:*:*:*:*:*",
"range": [
{
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{
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],
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{
"cpe": "cpe:2.3:a:squid-cache:squid:3.1.19:*:*:*:*:*:*:*",
"range": [
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],
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{
"cpe": "cpe:2.3:a:squid-cache:squid:3.1.20:*:*:*:*:*:*:*",
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{
"cpe": "cpe:2.3:a:squid-cache:squid:3.1.21:*:*:*:*:*:*:*",
"range": [
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"cpe": "cpe:2.3:a:squid-cache:squid:3.2.0.1:*:*:*:*:*:*:*",
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{
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{
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{
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{
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{
"cpe": "cpe:2.3:a:squid-cache:squid:3.2.0.15:*:*:*:*:*:*:*",
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{
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{
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],
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},
{
"cpe": "cpe:2.3:a:squid-cache:squid:3.2.0.17:*:*:*:*:*:*:*",
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{
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],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:squid-cache:squid:3.2.0.18:*:*:*:*:*:*:*",
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{
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],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:squid-cache:squid:3.2.0.19:*:*:*:*:*:*:*",
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{
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}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:squid-cache:squid:3.2.1:*:*:*:*:*:*:*",
"range": [
{
"introduced": "3.2.1"
},
{
"last_affected": "3.2.1"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:squid-cache:squid:3.2.2:*:*:*:*:*:*:*",
"range": [
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{
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{
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{
"cpe": "cpe:2.3:a:squid-cache:squid:3.2.4:*:*:*:*:*:*:*",
"range": [
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{
"cpe": "cpe:2.3:a:squid-cache:squid:3.2.5:*:*:*:*:*:*:*",
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{
"cpe": "cpe:2.3:a:squid-cache:squid:3.2.6:*:*:*:*:*:*:*",
"range": [
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{
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],
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{
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"3.3.5",
"3.3.6",
"3.3.7",
"3.3.8",
"3.3.9",
"3.4.0.1",
"3.4.0.2",
"3.4.0.3",
"3.4.1",
"3.4.10",
"3.4.11",
"3.4.12",
"3.4.13",
"3.4.14",
"3.4.2",
"3.4.3",
"3.4.4",
"3.4.4.1",
"3.4.4.2",
"3.4.8",
"3.4.9",
"3.5.0.1",
"3.5.0.2",
"3.5.0.3",
"3.5.0.4",
"3.5.1",
"3.5.10",
"3.5.11",
"3.5.12",
"3.5.13",
"3.5.14",
"3.5.15",
"3.5.16",
"3.5.17",
"3.5.2",
"3.5.3",
"3.5.4",
"3.5.5",
"3.5.6",
"3.5.7",
"3.5.8",
"3.5.9",
"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"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2016-4556.json"
}
}
],
"modified": "2026-10-24T10:30:17.214420114Z",
"provider": "osv",
"references": [
"https://access.redhat.com/errata/RHSA-2016:1138",
"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:6:*:*:*:*:*:*:*",
"cpe:2.3:o:oracle:linux:7:*:*:*:*:*:*:*"
],
"vendor_product": "oracle:linux",
"extracted_events": [
{
"range": [
{
"introduced": "6"
},
{
"last_affected": "6"
},
{
"introduced": "7"
},
{
"last_affected": "7"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:a:squid-cache:squid:3.0:*:*:*:*:*:*:*",
"cpe:2.3:a:squid-cache:squid:3.3.0:*:*:*:*:*:*:*"
],
"vendor_product": "squid-cache:squid",
"extracted_events": [
{
"range": [
{
"introduced": "3.0"
},
{
"last_affected": "3.0"
},
{
"introduced": "3.3.0"
},
{
"last_affected": "3.3.0"
}
],
"source": "CPE_STRING"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2016-4556",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 429516,
"published_at": "2016-05-10T19:59:03.387+00:00"
}