UnratedFix available
squid, squid3 vulnerabilities
Type: advisorySources: OSV
It was discovered that Squid incorrectly handled certain HTTP Transfer- Encoding headers. An attacker could possibly use this issue to perform HTTP request smuggling attacks, bypass security mechanisms, or poison web caches. (CVE-2026-61642) It was discovered that Squid incorrectly handled certain cache digest replies, which could lead to a buffer overflow. A remote attacker could possibly use this issue to cause Squid to crash, resulting in a denial of service. This issue only affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS. (CVE-2026-50012) It was discovered that Squid incorrectly handled parsing certain FTP directory listings. A remote attacker could possibly use this issue to obtain sensitive information. This issue only affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS. (CVE-2026-47729) It was discovered that Squid incorrectly handled certain ICP traffic. A remote attacker could possibly use this issue to cause Squid to crash, resulting in a denial of service. This issue only affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS. (CVE-2026-32748, CVE-2026-33526) It was discovered that Squid incorrectly handled certain ICP requests. A remote attacker could possibly use this issue to obtain sensitive information. This issue only affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS. (CVE-2026-33515)
- 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, 6.14-0ubuntu0.24.04.1, 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
- 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-2026-32748, CVE-2026-33515, CVE-2026-33526, CVE-2026-47729, CVE-2026-50012, CVE-2026-61642
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 16:39 UTC · Revision 1
Source evidence
It was discovered that Squid incorrectly handled certain HTTP Transfer- Encoding headers. An attacker could possibly use this issue to perform HTTP request smuggling attacks, bypass security mechanisms, or poison web caches. (CVE-2026-61642) It was discovered that Squid incorrectly handled certain cache digest replies, which could lead to a buffer overflow. A remote attacker could possibly use this issue to cause Squid to crash, resulting in a denial of service. This issue only affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS. (CVE-2026-50012) It was discovered that Squid incorrectly handled parsing certain FTP directory listings. A remote attacker could possibly use this issue to obtain sensitive information. This issue only affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS. (CVE-2026-47729) It was discovered that Squid incorrectly handled certain ICP traffic. A remote attacker could possibly use this issue to cause Squid to crash, resulting in a denial of service. This issue only affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS. (CVE-2026-32748, CVE-2026-33526) It was discovered that Squid incorrectly handled certain ICP requests. A remote attacker could possibly use this issue to obtain sensitive information. This issue only affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS. (CVE-2026-33515)
osv:USN-8941-1
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
Complete source record
{
"id": "245eec73cf3fb31d609fb1874ab27b64707c7b5c1144dc6833b2f1e60a5c495d",
"url": "https://osv.dev/vulnerability/USN-8941-1",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "squid, squid3 vulnerabilities",
"summary": "It was discovered that Squid incorrectly handled certain HTTP Transfer- Encoding headers. An attacker could possibly use this issue to perform HTTP request smuggling attacks, bypass security mechanisms, or poison web caches. (CVE-2026-61642) It was discovered that Squid incorrectly handled certain cache digest replies, which could lead to a buffer overflow. A remote attacker could possibly use this issue to cause Squid to crash, resulting in a denial of service. This issue only affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS. (CVE-2026-50012) It was discovered that Squid incorrectly handled parsing certain FTP directory listings. A remote attacker could possibly use this issue to obtain sensitive information. This issue only affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS. (CVE-2026-47729) It was discovered that Squid incorrectly handled certain ICP traffic. A remote attacker could possibly use this issue to cause Squid to crash, resulting in a denial of service. This issue only affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS. (CVE-2026-32748, CVE-2026-33526) It was discovered that Squid incorrectly handled certain ICP requests. A remote attacker could possibly use this issue to obtain sensitive information. This issue only affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS. (CVE-2026-33515)",
"evidence": "osv:USN-8941-1",
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{
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},
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{
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{
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"affected_versions": [
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{
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{
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{
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{
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{
"value": "3.5.27-1ubuntu1.12",
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{
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{
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{
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{
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{
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{
"value": "4.9-2ubuntu3",
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{
"value": "4.9-2ubuntu4",
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{
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{
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{
"value": "4.10-1ubuntu1.2",
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{
"value": "4.10-1ubuntu1.3",
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{
"value": "4.10-1ubuntu1.4",
"evidence": "/affected/2/versions"
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{
"value": "4.10-1ubuntu1.5",
"evidence": "/affected/2/versions"
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{
"value": "4.10-1ubuntu1.6",
"evidence": "/affected/2/versions"
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{
"value": "4.10-1ubuntu1.7",
"evidence": "/affected/2/versions"
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{
"value": "4.10-1ubuntu1.8",
"evidence": "/affected/2/versions"
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{
"value": "4.10-1ubuntu1.9",
"evidence": "/affected/2/versions"
},
{
"value": "4.10-1ubuntu1.10",
"evidence": "/affected/2/versions"
},
{
"value": "4.10-1ubuntu1.11",
"evidence": "/affected/2/versions"
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{
"value": "4.10-1ubuntu1.12",
"evidence": "/affected/2/versions"
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{
"value": "4.10-1ubuntu1.13",
"evidence": "/affected/2/versions"
},
{
"value": "4.10-1ubuntu1.13+esm1",
"evidence": "/affected/2/versions"
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{
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{
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{
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{
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"affected_versions": [
{
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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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]
}
],
"severity": "unknown",
"structured": {
"id": "USN-8941-1",
"aliases": [
"USN-8941-1"
],
"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/usn/USN-8941-1.json",
"cves_map": {
"cves": [
{
"id": "CVE-2026-32748",
"severity": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L"
},
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
},
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
]
},
{
"id": "CVE-2026-33515",
"severity": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:L/SI:N/SA:N"
},
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
]
},
{
"id": "CVE-2026-33526",
"severity": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H"
},
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
},
{
"type": "CVSS_V3",
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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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{
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],
"modified": "2026-10-21T23:11:56.281723379Z",
"provider": "osv",
"upstream": [
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"CVE-2026-33515",
"CVE-2026-33526",
"CVE-2026-47729",
"CVE-2026-50012",
"CVE-2026-61642",
"UBUNTU-CVE-2026-32748",
"UBUNTU-CVE-2026-33515",
"UBUNTU-CVE-2026-33526",
"UBUNTU-CVE-2026-47729",
"UBUNTU-CVE-2026-50012",
"UBUNTU-CVE-2026-61642"
],
"references": [
"https://ubuntu.com/security/notices/USN-8941-1",
"https://ubuntu.com/security/CVE-2026-32748",
"https://ubuntu.com/security/CVE-2026-33515",
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"https://ubuntu.com/security/CVE-2026-50012",
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},
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{
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"evidence": "/upstream"
},
{
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"evidence": "/upstream"
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{
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"evidence": "/upstream"
},
{
"value": "CVE-2026-50012",
"evidence": "/upstream"
},
{
"value": "CVE-2026-61642",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 401079,
"published_at": "2026-10-20T13:59:52+00:00"
}