HighFix available
squid, squid3 — security advisory
Squid is a caching proxy for the Web. From 3.3.0.1 to before 7.6, due to an improper enforcement of behavioral workflow bug, Squid is vulnerable to a Request Smuggling attack against HTTP/1.1 Transfer-Encoding. HTTP header parsing (`src/HttpHeader.cc`) accepted the bare` Transfer-Encoding:` identity form, which the HTTP specification prohibits because any transfer coding must be wrapped within chunked encoding. This problem allows a trusted client to perform an HTTP Request Smuggling attack when HTTP/1.1 is used, bypassing security mechanisms that may be in place between attacker and Squid. When there is an HTTP cache operating prior to the affected Squid, this Request Smuggling attack also allows the attacker to poison that web cache and store arbitrary malicious content at any URL for delivery to other clients' future requests. This issue is fixed in version 7.6.
- Products
- squid, squid3
- Affected versions
- 3.3.8-1ubuntu16, 3.3.8-1ubuntu17, 3.5.12-1ubuntu6, 3.5.12-1ubuntu7, 3.5.12-1ubuntu7.1, 3.5.12-1ubuntu7.10, 3.5.12-1ubuntu7.11, 3.5.12-1ubuntu7.12, 3.5.12-1ubuntu7.13, 3.5.12-1ubuntu7.14, 3.5.12-1ubuntu7.15, 3.5.12-1ubuntu7.16, 3.5.12-1ubuntu7.16+esm1, 3.5.12-1ubuntu7.16+esm2, 3.5.12-1ubuntu7.16+esm3, 3.5.12-1ubuntu7.16+esm4, 3.5.12-1ubuntu7.16+esm5, 3.5.12-1ubuntu7.16+esm6, 3.5.12-1ubuntu7.2, 3.5.12-1ubuntu7.3, 3.5.12-1ubuntu7.4, 3.5.12-1ubuntu7.5, 3.5.12-1ubuntu7.6, 3.5.12-1ubuntu7.7, 3.5.12-1ubuntu7.8, 3.5.12-1ubuntu7.9, 3.5.23-5ubuntu1, 3.5.23-5ubuntu2, 3.5.27-1ubuntu1, 3.5.27-1ubuntu1.1, 3.5.27-1ubuntu1.10, 3.5.27-1ubuntu1.11, 3.5.27-1ubuntu1.12, 3.5.27-1ubuntu1.13, 3.5.27-1ubuntu1.14, 3.5.27-1ubuntu1.14+esm1, 3.5.27-1ubuntu1.14+esm2, 3.5.27-1ubuntu1.14+esm3, 3.5.27-1ubuntu1.14+esm4, 3.5.27-1ubuntu1.14+esm5, 3.5.27-1ubuntu1.2, 3.5.27-1ubuntu1.3, 3.5.27-1ubuntu1.4, 3.5.27-1ubuntu1.5, 3.5.27-1ubuntu1.6, 3.5.27-1ubuntu1.7, 3.5.27-1ubuntu1.8, 3.5.27-1ubuntu1.9, 4.10-1ubuntu1, 4.10-1ubuntu1.1, 4.10-1ubuntu1.10, 4.10-1ubuntu1.11, 4.10-1ubuntu1.12, 4.10-1ubuntu1.13, 4.10-1ubuntu1.13+esm1, 4.10-1ubuntu1.13+esm2, 4.10-1ubuntu1.2, 4.10-1ubuntu1.3, 4.10-1ubuntu1.4, 4.10-1ubuntu1.5, 4.10-1ubuntu1.6, 4.10-1ubuntu1.7, 4.10-1ubuntu1.8, 4.10-1ubuntu1.9, 4.13-10ubuntu5, 4.8-1ubuntu2, 4.8-1ubuntu3, 4.9-2ubuntu1, 4.9-2ubuntu2, 4.9-2ubuntu3, 4.9-2ubuntu4, 5.2-1ubuntu1, 5.2-1ubuntu3, 5.2-1ubuntu4, 5.2-1ubuntu4.1, 5.2-1ubuntu4.2, 5.2-1ubuntu4.3, 5.7-0ubuntu0.22.04.1, 5.7-0ubuntu0.22.04.2, 5.7-0ubuntu0.22.04.3, 5.7-0ubuntu0.22.04.4, 5.9-0ubuntu0.22.04.1, 5.9-0ubuntu0.22.04.2, 5.9-0ubuntu0.22.04.3, 5.9-0ubuntu0.22.04.4, 5.9-0ubuntu0.22.04.5, 5.9-0ubuntu0.22.04.7, 6.1-2ubuntu1, 6.1-2ubuntu2, 6.10-0ubuntu0.24.04.1, 6.13-0ubuntu0.24.04.1, 6.13-0ubuntu0.24.04.2, 6.13-0ubuntu0.24.04.3, 6.13-1ubuntu4, 6.13-1ubuntu5, 6.14-0ubuntu0.24.04.1, 6.14-0ubuntu0.24.04.2, 6.14-0ubuntu0.24.04.4, 6.5-1ubuntu1, 6.5-1ubuntu2, 6.5-1ubuntu3, 6.6-1ubuntu4, 6.6-1ubuntu5, 6.6-1ubuntu5.1, 7.2-2ubuntu1, 7.2-2ubuntu2, 7.2-2ubuntu2.2, 7.7-0ubuntu0.26.04.1
- Fixed versions
- 3.5.12-1ubuntu7.16+esm7, 3.5.27-1ubuntu1.14+esm6, 4.10-1ubuntu1.13+esm3, 5.9-0ubuntu0.22.04.8, 6.14-0ubuntu0.24.04.5
- CVEs
- CVE-2026-61642
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 17:59 UTC · Revision 1
Source evidence
Squid is a caching proxy for the Web. From 3.3.0.1 to before 7.6, due to an improper enforcement of behavioral workflow bug, Squid is vulnerable to a Request Smuggling attack against HTTP/1.1 Transfer-Encoding. HTTP header parsing (`src/HttpHeader.cc`) accepted the bare` Transfer-Encoding:` identity form, which the HTTP specification prohibits because any transfer coding must be wrapped within chunked encoding. This problem allows a trusted client to perform an HTTP Request Smuggling attack when HTTP/1.1 is used, bypassing security mechanisms that may be in place between attacker and Squid. When there is an HTTP cache operating prior to the affected Squid, this Request Smuggling attack also allows the attacker to poison that web cache and store arbitrary malicious content at any URL for delivery to other clients' future requests. This issue is fixed in version 7.6.
osv:UBUNTU-CVE-2026-61642
squid3
Fixed versions: 3.5.12-1ubuntu7.16+esm7
squid3
Fixed versions: 3.5.27-1ubuntu1.14+esm6
squid
Fixed versions: 4.10-1ubuntu1.13+esm3
squid
Fixed versions: 5.9-0ubuntu0.22.04.8
squid
Fixed versions: 6.14-0ubuntu0.24.04.5
squid
Fixed versions: Not specified
Complete source record
{
"id": "638de18eaef5f893a898b50f6385cb96de29dbc59d8b982581d43a16c045006e",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-61642",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-61642",
"summary": "Squid is a caching proxy for the Web. From 3.3.0.1 to before 7.6, due to an improper enforcement of behavioral workflow bug, Squid is vulnerable to a Request Smuggling attack against HTTP/1.1 Transfer-Encoding. HTTP header parsing (`src/HttpHeader.cc`) accepted the bare` Transfer-Encoding:` identity form, which the HTTP specification prohibits because any transfer coding must be wrapped within chunked encoding. This problem allows a trusted client to perform an HTTP Request Smuggling attack when HTTP/1.1 is used, bypassing security mechanisms that may be in place between attacker and Squid. When there is an HTTP cache operating prior to the affected Squid, this Request Smuggling attack also allows the attacker to poison that web cache and store arbitrary malicious content at any URL for delivery to other clients' future requests. This issue is fixed in version 7.6.",
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{
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{
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{
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{
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{
"value": "4.10-1ubuntu1.12",
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{
"value": "4.10-1ubuntu1.13",
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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},
{
"name": {
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{
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{
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"evidence": "/affected/5/versions"
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{
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{
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{
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},
{
"value": "7.7-0ubuntu0.26.04.1",
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}
]
}
],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2026-61642",
"aliases": [
"UBUNTU-CVE-2026-61642"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.5.12-1ubuntu7.16+esm7"
}
]
}
],
"package": {
"name": "squid3",
"purl": "pkg:deb/ubuntu/squid3?arch=source&distro=esm-infra-legacy%2Fxenial",
"ecosystem": "Ubuntu:Pro:16.04:LTS"
},
"versions": [
"3.3.8-1ubuntu16",
"3.3.8-1ubuntu17",
"3.5.12-1ubuntu6",
"3.5.12-1ubuntu7",
"3.5.12-1ubuntu7.1",
"3.5.12-1ubuntu7.2",
"3.5.12-1ubuntu7.3",
"3.5.12-1ubuntu7.4",
"3.5.12-1ubuntu7.5",
"3.5.12-1ubuntu7.6",
"3.5.12-1ubuntu7.7",
"3.5.12-1ubuntu7.8",
"3.5.12-1ubuntu7.9",
"3.5.12-1ubuntu7.10",
"3.5.12-1ubuntu7.11",
"3.5.12-1ubuntu7.12",
"3.5.12-1ubuntu7.13",
"3.5.12-1ubuntu7.14",
"3.5.12-1ubuntu7.15",
"3.5.12-1ubuntu7.16",
"3.5.12-1ubuntu7.16+esm1",
"3.5.12-1ubuntu7.16+esm2",
"3.5.12-1ubuntu7.16+esm3",
"3.5.12-1ubuntu7.16+esm4",
"3.5.12-1ubuntu7.16+esm5",
"3.5.12-1ubuntu7.16+esm6"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-61642.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "squid",
"binary_version": "3.5.12-1ubuntu7.16+esm7"
},
{
"binary_name": "squid-cgi",
"binary_version": "3.5.12-1ubuntu7.16+esm7"
},
{
"binary_name": "squid-common",
"binary_version": "3.5.12-1ubuntu7.16+esm7"
},
{
"binary_name": "squid-purge",
"binary_version": "3.5.12-1ubuntu7.16+esm7"
},
{
"binary_name": "squid3",
"binary_version": "3.5.12-1ubuntu7.16+esm7"
},
{
"binary_name": "squidclient",
"binary_version": "3.5.12-1ubuntu7.16+esm7"
}
],
"availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.5.27-1ubuntu1.14+esm6"
}
]
}
],
"package": {
"name": "squid3",
"purl": "pkg:deb/ubuntu/squid3?arch=source&distro=esm-infra%2Fbionic",
"ecosystem": "Ubuntu:Pro:18.04:LTS"
},
"versions": [
"3.5.23-5ubuntu1",
"3.5.23-5ubuntu2",
"3.5.27-1ubuntu1",
"3.5.27-1ubuntu1.1",
"3.5.27-1ubuntu1.2",
"3.5.27-1ubuntu1.3",
"3.5.27-1ubuntu1.4",
"3.5.27-1ubuntu1.5",
"3.5.27-1ubuntu1.6",
"3.5.27-1ubuntu1.7",
"3.5.27-1ubuntu1.8",
"3.5.27-1ubuntu1.9",
"3.5.27-1ubuntu1.10",
"3.5.27-1ubuntu1.11",
"3.5.27-1ubuntu1.12",
"3.5.27-1ubuntu1.13",
"3.5.27-1ubuntu1.14",
"3.5.27-1ubuntu1.14+esm1",
"3.5.27-1ubuntu1.14+esm2",
"3.5.27-1ubuntu1.14+esm3",
"3.5.27-1ubuntu1.14+esm4",
"3.5.27-1ubuntu1.14+esm5"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-61642.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "squid",
"binary_version": "3.5.27-1ubuntu1.14+esm6"
},
{
"binary_name": "squid-cgi",
"binary_version": "3.5.27-1ubuntu1.14+esm6"
},
{
"binary_name": "squid-common",
"binary_version": "3.5.27-1ubuntu1.14+esm6"
},
{
"binary_name": "squid-purge",
"binary_version": "3.5.27-1ubuntu1.14+esm6"
},
{
"binary_name": "squid3",
"binary_version": "3.5.27-1ubuntu1.14+esm6"
},
{
"binary_name": "squidclient",
"binary_version": "3.5.27-1ubuntu1.14+esm6"
}
],
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "4.10-1ubuntu1.13+esm3"
}
]
}
],
"package": {
"name": "squid",
"purl": "pkg:deb/ubuntu/squid?arch=source&distro=esm-infra%2Ffocal",
"ecosystem": "Ubuntu:Pro:20.04:LTS"
},
"versions": [
"4.8-1ubuntu2",
"4.8-1ubuntu3",
"4.9-2ubuntu1",
"4.9-2ubuntu2",
"4.9-2ubuntu3",
"4.9-2ubuntu4",
"4.10-1ubuntu1",
"4.10-1ubuntu1.1",
"4.10-1ubuntu1.2",
"4.10-1ubuntu1.3",
"4.10-1ubuntu1.4",
"4.10-1ubuntu1.5",
"4.10-1ubuntu1.6",
"4.10-1ubuntu1.7",
"4.10-1ubuntu1.8",
"4.10-1ubuntu1.9",
"4.10-1ubuntu1.10",
"4.10-1ubuntu1.11",
"4.10-1ubuntu1.12",
"4.10-1ubuntu1.13",
"4.10-1ubuntu1.13+esm1",
"4.10-1ubuntu1.13+esm2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-61642.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "squid",
"binary_version": "4.10-1ubuntu1.13+esm3"
},
{
"binary_name": "squid-cgi",
"binary_version": "4.10-1ubuntu1.13+esm3"
},
{
"binary_name": "squid-common",
"binary_version": "4.10-1ubuntu1.13+esm3"
},
{
"binary_name": "squid-purge",
"binary_version": "4.10-1ubuntu1.13+esm3"
},
{
"binary_name": "squidclient",
"binary_version": "4.10-1ubuntu1.13+esm3"
}
],
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "5.9-0ubuntu0.22.04.8"
}
]
}
],
"package": {
"name": "squid",
"purl": "pkg:deb/ubuntu/squid?arch=source&distro=jammy",
"ecosystem": "Ubuntu:22.04:LTS"
},
"versions": [
"4.13-10ubuntu5",
"5.2-1ubuntu1",
"5.2-1ubuntu3",
"5.2-1ubuntu4",
"5.2-1ubuntu4.1",
"5.2-1ubuntu4.2",
"5.2-1ubuntu4.3",
"5.7-0ubuntu0.22.04.1",
"5.7-0ubuntu0.22.04.2",
"5.7-0ubuntu0.22.04.3",
"5.7-0ubuntu0.22.04.4",
"5.9-0ubuntu0.22.04.1",
"5.9-0ubuntu0.22.04.2",
"5.9-0ubuntu0.22.04.3",
"5.9-0ubuntu0.22.04.4",
"5.9-0ubuntu0.22.04.5",
"5.9-0ubuntu0.22.04.7"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-61642.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "squid",
"binary_version": "5.9-0ubuntu0.22.04.8"
},
{
"binary_name": "squid-cgi",
"binary_version": "5.9-0ubuntu0.22.04.8"
},
{
"binary_name": "squid-common",
"binary_version": "5.9-0ubuntu0.22.04.8"
},
{
"binary_name": "squid-openssl",
"binary_version": "5.9-0ubuntu0.22.04.8"
},
{
"binary_name": "squid-purge",
"binary_version": "5.9-0ubuntu0.22.04.8"
},
{
"binary_name": "squidclient",
"binary_version": "5.9-0ubuntu0.22.04.8"
}
],
"availability": "No subscription required"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "6.14-0ubuntu0.24.04.5"
}
]
}
],
"package": {
"name": "squid",
"purl": "pkg:deb/ubuntu/squid?arch=source&distro=noble",
"ecosystem": "Ubuntu:24.04:LTS"
},
"versions": [
"6.1-2ubuntu1",
"6.1-2ubuntu2",
"6.5-1ubuntu1",
"6.5-1ubuntu2",
"6.5-1ubuntu3",
"6.6-1ubuntu4",
"6.6-1ubuntu5",
"6.6-1ubuntu5.1",
"6.10-0ubuntu0.24.04.1",
"6.13-0ubuntu0.24.04.1",
"6.13-0ubuntu0.24.04.2",
"6.13-0ubuntu0.24.04.3",
"6.14-0ubuntu0.24.04.1",
"6.14-0ubuntu0.24.04.2",
"6.14-0ubuntu0.24.04.4"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-61642.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "squid",
"binary_version": "6.14-0ubuntu0.24.04.5"
},
{
"binary_name": "squid-cgi",
"binary_version": "6.14-0ubuntu0.24.04.5"
},
{
"binary_name": "squid-common",
"binary_version": "6.14-0ubuntu0.24.04.5"
},
{
"binary_name": "squid-openssl",
"binary_version": "6.14-0ubuntu0.24.04.5"
},
{
"binary_name": "squid-purge",
"binary_version": "6.14-0ubuntu0.24.04.5"
},
{
"binary_name": "squidclient",
"binary_version": "6.14-0ubuntu0.24.04.5"
}
],
"availability": "No subscription required"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "squid",
"purl": "pkg:deb/ubuntu/squid?arch=source&distro=resolute",
"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
"6.13-1ubuntu4",
"6.13-1ubuntu5",
"7.2-2ubuntu1",
"7.2-2ubuntu2",
"7.2-2ubuntu2.2",
"7.7-0ubuntu0.26.04.1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-61642.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "squid",
"binary_version": "7.7-0ubuntu0.26.04.1"
},
{
"binary_name": "squid-common",
"binary_version": "7.7-0ubuntu0.26.04.1"
},
{
"binary_name": "squid-openssl",
"binary_version": "7.7-0ubuntu0.26.04.1"
}
]
}
}
],
"modified": "2026-10-22T10:30:15.547962095Z",
"provider": "osv",
"upstream": [
"CVE-2026-61642"
],
"references": [
"https://ubuntu.com/security/CVE-2026-61642",
"https://www.cve.org/CVERecord?id=CVE-2026-61642",
"https://github.com/squid-cache/squid/security/advisories/GHSA-537g-4gfh-w7m6",
"https://ubuntu.com/security/notices/USN-8941-1"
]
},
"related_cves": [
{
"value": "CVE-2026-61642",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 405404,
"published_at": "2026-10-13T17:17:00+00:00"
}