UBUNTU-CVE-2026-54388

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Source
https://ubuntu.com/security/CVE-2026-54388
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54388.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-54388
Upstream
Published
2026-06-17T20:17:00Z
Modified
2026-06-24T11:01:57.949580195Z
Severity
  • 9.1 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N CVSS Calculator
  • 9.3 (Critical) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

Tinyproxy through 1.11.3, fixed in commit 364cdb6, fails to reject requests containing multiple Content-Length headers with differing values, forwarding all duplicate headers to the backend while using the first value to determine how many request body bytes to consume. Remote attackers can desynchronize the proxy and backend parser state, allowing injection of arbitrary HTTP requests to the backend to enable cache poisoning, access control bypass, and request hijacking.

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
0Unknown 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-2026-54388.json"
Ubuntu:24.04:LTS
tinyproxy

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown 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-2026-54388.json"
Ubuntu:25.10
tinyproxy

Package

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

Affected ranges

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

Affected versions

1.*
1.11.2-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "tinyproxy",
            "binary_version": "1.11.2-1"
        },
        {
            "binary_name": "tinyproxy-bin",
            "binary_version": "1.11.2-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54388.json"
Ubuntu:26.04:LTS
tinyproxy

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown 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-2026-54388.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
0Unknown 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-2026-54388.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
0Unknown 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-2026-54388.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
0Unknown 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-2026-54388.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
0Unknown 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-2026-54388.json"