USN-8941-1

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Source
https://ubuntu.com/security/notices/USN-8941-1
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8941-1.json
JSON Data
https://api.osv.dev/v1/vulns/USN-8941-1
Upstream
CVE (6)
Published
2026-10-20T13:59:52Z
Modified
2026-10-20T22:58:05Z
Summary
squid, squid3 vulnerabilities
Details

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)

References

Affected packages

Ubuntu:Pro:16.04:LTS / squid3

Package

Name
squid3
Purl
pkg:deb/ubuntu/squid3?arch=source&distro=esm-infra-legacy%2Fxenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
3.5.12-1ubuntu7.16+esm7

Affected versions

3.*
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

Ecosystem specific 

{
    "availability":  "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
    "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"
        }
    ]
}

Database specific

cves_map 
{
    "cves":  [],
    "ecosystem":  "Ubuntu:Pro:16.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8941-1.json"

Ubuntu:Pro:18.04:LTS / squid3

Package

Name
squid3
Purl
pkg:deb/ubuntu/squid3?arch=source&distro=esm-infra%2Fbionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
3.5.27-1ubuntu1.14+esm6

Affected versions

3.*
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

Ecosystem specific 

{
    "availability":  "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
    "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"
        }
    ]
}

Database specific

cves_map 
{
    "cves":  [],
    "ecosystem":  "Ubuntu:Pro:18.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8941-1.json"

Ubuntu:Pro:20.04:LTS / squid

Package

Name
squid
Purl
pkg:deb/ubuntu/squid?arch=source&distro=esm-infra%2Ffocal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
4.10-1ubuntu1.13+esm3

Affected versions

4.*
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

Ecosystem specific 

{
    "availability":  "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
    "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"
        }
    ]
}

Database specific

cves_map 
{
    "cves":  [],
    "ecosystem":  "Ubuntu:Pro:20.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8941-1.json"

Ubuntu:22.04:LTS / squid

Package

Name
squid
Purl
pkg:deb/ubuntu/squid?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
5.9-0ubuntu0.22.04.8

Affected versions

4.*
4.13-10ubuntu5
5.*
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

Ecosystem specific 

{
    "availability":  "No subscription required",
    "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"
        }
    ]
}

Database specific

cves_map 
{
    "cves":  [],
    "ecosystem":  "Ubuntu:22.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8941-1.json"

Ubuntu:24.04:LTS / squid

Package

Name
squid
Purl
pkg:deb/ubuntu/squid?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
6.14-0ubuntu0.24.04.5

Affected versions

6.*
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

Ecosystem specific 

{
    "availability":  "No subscription required",
    "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"
        }
    ]
}

Database specific

cves_map 
{
    "cves":  [],
    "ecosystem":  "Ubuntu:24.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8941-1.json"