UBUNTU-CVE-2026-125371

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Source
https://ubuntu.com/security/CVE-2026-125371
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-125371.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-125371
Upstream
Published
2026-11-10T00:00:00Z
Modified
2026-11-11T09:39:22Z
Severity
  • 6.3 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

Tinyproxy through 1.11.3 contains an access control bypass vulnerability in acl_string_processing() in src/acl.c that compares only trailing hostname characters without checking DNS label boundaries. Attackers controlling the PTR record for their source IP, such as untrusted.net, can satisfy an 'Allow trusted.net' entry to use the proxy despite deny-by-default ACLs.

References

Affected packages

Ubuntu:20.04:LTS
tinyproxy

Package

Name
tinyproxy
Purl
pkg:deb/ubuntu/tinyproxy?arch=source&distro=focal

Affected ranges

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

Affected versions

1.*
1.10.0-2
1.10.0-4
1.10.0-4ubuntu0.1
1.10.0-4ubuntu0.2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "tinyproxy",
            "binary_version": "1.10.0-4ubuntu0.2"
        },
        {
            "binary_name": "tinyproxy-bin",
            "binary_version": "1.10.0-4ubuntu0.2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-125371.json"
Ubuntu:24.04:LTS
tinyproxy

Package

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

Affected ranges

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

Affected versions

1.*
1.11.1-2.1
1.11.1-3
1.11.1-3ubuntu0.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "tinyproxy",
            "binary_version": "1.11.1-3ubuntu0.1"
        },
        {
            "binary_name": "tinyproxy-bin",
            "binary_version": "1.11.1-3ubuntu0.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-125371.json"
Ubuntu:26.04:LTS
tinyproxy

Package

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

Affected ranges

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

Affected versions

1.*
1.11.2-1
1.11.2-1build1
1.11.3-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "tinyproxy",
            "binary_version": "1.11.3-1"
        },
        {
            "binary_name": "tinyproxy-bin",
            "binary_version": "1.11.3-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-125371.json"
Ubuntu:26.10
tinyproxy

Package

Name
tinyproxy
Purl
pkg:deb/ubuntu/tinyproxy?arch=source&distro=stonking

Affected ranges

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

Affected versions

1.*
1.11.3-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "tinyproxy",
            "binary_version": "1.11.3-1"
        },
        {
            "binary_name": "tinyproxy-bin",
            "binary_version": "1.11.3-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-125371.json"
Ubuntu:Pro:14.04:LTS
tinyproxy

Package

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

Affected ranges

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

Affected versions

1.*
1.8.3-3ubuntu1
1.8.3-3ubuntu14.04.1~esm1
1.8.3-3ubuntu14.04.1~esm2
1.8.3-3ubuntu14.04.1~esm3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "tinyproxy",
            "binary_version": "1.8.3-3ubuntu14.04.1~esm3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-125371.json"
Ubuntu:Pro:16.04:LTS
tinyproxy

Package

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

Affected ranges

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

Affected versions

1.*
1.8.3-3ubuntu1
1.8.3-3ubuntu16.04.1~esm1
1.8.3-3ubuntu16.04.1~esm2
1.8.3-3ubuntu16.04.1~esm3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "tinyproxy",
            "binary_version": "1.8.3-3ubuntu16.04.1~esm3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-125371.json"
Ubuntu:Pro:18.04:LTS
tinyproxy

Package

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

Affected ranges

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

Affected versions

1.*
1.8.4-2
1.8.4-3
1.8.4-5
1.8.4-5ubuntu0.1~esm1
1.8.4-5ubuntu0.1~esm2
1.8.4-5ubuntu0.1~esm3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "tinyproxy",
            "binary_version": "1.8.4-5ubuntu0.1~esm3"
        },
        {
            "binary_name": "tinyproxy-bin",
            "binary_version": "1.8.4-5ubuntu0.1~esm3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-125371.json"
Ubuntu:Pro:22.04:LTS
tinyproxy

Package

Name
tinyproxy
Purl
pkg:deb/ubuntu/tinyproxy?arch=source&distro=esm-apps%2Fjammy

Affected ranges

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

Affected versions

1.*
1.10.0-5
1.11.0-1
1.11.0-1ubuntu0.1~esm1
1.11.0-1ubuntu0.1~esm2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "tinyproxy",
            "binary_version": "1.11.0-1ubuntu0.1~esm2"
        },
        {
            "binary_name": "tinyproxy-bin",
            "binary_version": "1.11.0-1ubuntu0.1~esm2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-125371.json"