UBUNTU-CVE-2026-3945

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Source
https://ubuntu.com/security/CVE-2026-3945
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-3945.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-3945
Upstream
  • CVE-2026-3945
Published
2026-03-30T08:16:00Z
Modified
2026-05-20T16:25:38.753116021Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
  • 8.7 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

An integer overflow vulnerability in the HTTP chunked transfer encoding parser in tinyproxy up to and including version 1.11.3 allows an unauthenticated remote attacker to cause a denial of service (DoS). The issue occurs because chunk size values are parsed using strtol() without properly validating overflow conditions (e.g., errno == ERANGE). A crafted chunk size such as 0x7fffffffffffffff (LONG_MAX) bypasses the existing validation check (chunklen < 0), leading to a signed integer overflow during arithmetic operations (chunklen + 2). This results in incorrect size calculations, causing the proxy to attempt reading an extremely large amount of request-body data and holding worker connections open indefinitely. An attacker can exploit this behavior to exhaust all available worker slots, preventing new connections from being accepted and causing complete service unavailability. Upstream addressed this issue in commit bb7edc4; however, the latest stable release (1.11.3) remains affected at the time of publication.

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-2026-3945.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-2026-3945.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-2026-3945.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-2026-3945.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-2026-3945.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-2026-3945.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-2026-3945.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-2026-3945.json"