UBUNTU-CVE-2026-50012

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Source
https://ubuntu.com/security/CVE-2026-50012
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-50012.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-50012
Upstream
Downstream
Related
Published
2026-06-12T00:00:00Z
Modified
2026-07-29T10:18:19Z
Severity
  • 5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:H CVSS Calculator
  • 5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

Squid is a caching proxy for the Web. Prior to 7.6, due to an improper input validation bug in cache digest reply handling (peerDigestSwapInMask in src/peer_digest.cc), Squid is vulnerable to a heap-based buffer overflow: a cache digest's on-the-wire size may be larger than the mask_size declared within the digest, so a trusted peer sending a maliciously crafted reply to a cache_digest request message can trigger the overflow. This attack is limited to Squid instances compiled with the --enable-cache-digests option and configured with cache_peer entries. This issue is fixed in version 7.6.

References

Affected packages

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
5.9-0ubuntu0.22.04.7

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

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "squid",
            "binary_version": "5.9-0ubuntu0.22.04.7"
        },
        {
            "binary_name": "squid-cgi",
            "binary_version": "5.9-0ubuntu0.22.04.7"
        },
        {
            "binary_name": "squid-common",
            "binary_version": "5.9-0ubuntu0.22.04.7"
        },
        {
            "binary_name": "squid-openssl",
            "binary_version": "5.9-0ubuntu0.22.04.7"
        },
        {
            "binary_name": "squid-purge",
            "binary_version": "5.9-0ubuntu0.22.04.7"
        },
        {
            "binary_name": "squidclient",
            "binary_version": "5.9-0ubuntu0.22.04.7"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-50012.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
6.14-0ubuntu0.24.04.4

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

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "squid",
            "binary_version": "6.14-0ubuntu0.24.04.4"
        },
        {
            "binary_name": "squid-cgi",
            "binary_version": "6.14-0ubuntu0.24.04.4"
        },
        {
            "binary_name": "squid-common",
            "binary_version": "6.14-0ubuntu0.24.04.4"
        },
        {
            "binary_name": "squid-openssl",
            "binary_version": "6.14-0ubuntu0.24.04.4"
        },
        {
            "binary_name": "squid-purge",
            "binary_version": "6.14-0ubuntu0.24.04.4"
        },
        {
            "binary_name": "squidclient",
            "binary_version": "6.14-0ubuntu0.24.04.4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-50012.json"
Ubuntu:25.10
squid

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
6.14-0ubuntu0.25.10.4

Affected versions

6.*
6.13-1ubuntu1
6.13-1ubuntu2
6.13-1ubuntu3
6.13-1ubuntu4
6.13-1ubuntu4.1
6.14-0ubuntu0.25.10.1
6.14-0ubuntu0.25.10.2

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "squid",
            "binary_version": "6.14-0ubuntu0.25.10.4"
        },
        {
            "binary_name": "squid-cgi",
            "binary_version": "6.14-0ubuntu0.25.10.4"
        },
        {
            "binary_name": "squid-common",
            "binary_version": "6.14-0ubuntu0.25.10.4"
        },
        {
            "binary_name": "squid-openssl",
            "binary_version": "6.14-0ubuntu0.25.10.4"
        },
        {
            "binary_name": "squid-purge",
            "binary_version": "6.14-0ubuntu0.25.10.4"
        },
        {
            "binary_name": "squidclient",
            "binary_version": "6.14-0ubuntu0.25.10.4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-50012.json"
Ubuntu:26.04:LTS
squid

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
7.2-2ubuntu2.2

Affected versions

6.*
6.13-1ubuntu4
6.13-1ubuntu5
7.*
7.2-2ubuntu1
7.2-2ubuntu2

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "squid",
            "binary_version": "7.2-2ubuntu2.2"
        },
        {
            "binary_name": "squid-common",
            "binary_version": "7.2-2ubuntu2.2"
        },
        {
            "binary_name": "squid-openssl",
            "binary_version": "7.2-2ubuntu2.2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-50012.json"
Ubuntu:Pro:16.04:LTS
squid3

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

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 

{
    "binaries": [
        {
            "binary_name": "squid",
            "binary_version": "3.5.12-1ubuntu7.16+esm6"
        },
        {
            "binary_name": "squid-cgi",
            "binary_version": "3.5.12-1ubuntu7.16+esm6"
        },
        {
            "binary_name": "squid-common",
            "binary_version": "3.5.12-1ubuntu7.16+esm6"
        },
        {
            "binary_name": "squid-purge",
            "binary_version": "3.5.12-1ubuntu7.16+esm6"
        },
        {
            "binary_name": "squid3",
            "binary_version": "3.5.12-1ubuntu7.16+esm6"
        },
        {
            "binary_name": "squidclient",
            "binary_version": "3.5.12-1ubuntu7.16+esm6"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-50012.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

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 

{
    "binaries": [
        {
            "binary_name": "squid",
            "binary_version": "3.5.27-1ubuntu1.14+esm5"
        },
        {
            "binary_name": "squid-cgi",
            "binary_version": "3.5.27-1ubuntu1.14+esm5"
        },
        {
            "binary_name": "squid-common",
            "binary_version": "3.5.27-1ubuntu1.14+esm5"
        },
        {
            "binary_name": "squid-purge",
            "binary_version": "3.5.27-1ubuntu1.14+esm5"
        },
        {
            "binary_name": "squid3",
            "binary_version": "3.5.27-1ubuntu1.14+esm5"
        },
        {
            "binary_name": "squidclient",
            "binary_version": "3.5.27-1ubuntu1.14+esm5"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-50012.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

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 

{
    "binaries": [
        {
            "binary_name": "squid",
            "binary_version": "4.10-1ubuntu1.13+esm2"
        },
        {
            "binary_name": "squid-cgi",
            "binary_version": "4.10-1ubuntu1.13+esm2"
        },
        {
            "binary_name": "squid-common",
            "binary_version": "4.10-1ubuntu1.13+esm2"
        },
        {
            "binary_name": "squid-purge",
            "binary_version": "4.10-1ubuntu1.13+esm2"
        },
        {
            "binary_name": "squidclient",
            "binary_version": "4.10-1ubuntu1.13+esm2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-50012.json"