UBUNTU-CVE-2026-40561

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Source
https://ubuntu.com/security/CVE-2026-40561
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40561.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-40561
Upstream
  • CVE-2026-40561
Published
2026-05-03T01:15:00Z
Modified
2026-05-20T16:25:40.802164973Z
Severity
  • 5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

Starlet versions through 0.31 for Perl allows HTTP Request Smuggling via Improper Header Precedence. Starlet incorrectly prioritizes "Content-Length" over "Transfer-Encoding: chunked" when both headers are present in an HTTP request. Per RFC 7230 3.3.3, Transfer-Encoding must take precedence. An attacker could exploit this to smuggle malicious HTTP requests via a front-end reverse proxy.

References

Affected packages

Ubuntu:16.04:LTS
starlet

Package

Name
starlet
Purl
pkg:deb/ubuntu/starlet?arch=source&distro=xenial

Affected ranges

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

Affected versions

0.*
0.25-1
0.26-1
0.28-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "0.28-1",
            "binary_name": "starlet"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40561.json"
Ubuntu:18.04:LTS
starlet

Package

Name
starlet
Purl
pkg:deb/ubuntu/starlet?arch=source&distro=bionic

Affected ranges

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

Affected versions

0.*
0.31-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "0.31-1",
            "binary_name": "starlet"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40561.json"
Ubuntu:20.04:LTS
starlet

Package

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

Affected ranges

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

Affected versions

0.*
0.31-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "0.31-1",
            "binary_name": "starlet"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40561.json"
Ubuntu:22.04:LTS
starlet

Package

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

Affected ranges

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

Affected versions

0.*
0.31-1.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "0.31-1.1",
            "binary_name": "starlet"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40561.json"
Ubuntu:24.04:LTS
starlet

Package

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

Affected ranges

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

Affected versions

0.*
0.31-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "0.31-2",
            "binary_name": "starlet"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40561.json"
Ubuntu:25.10
starlet

Package

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

Affected ranges

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

Affected versions

0.*
0.31-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "0.31-2",
            "binary_name": "starlet"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40561.json"
Ubuntu:26.04:LTS
starlet

Package

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

Affected ranges

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

Affected versions

0.*
0.31-2
0.31-2build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "0.31-2build1",
            "binary_name": "starlet"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40561.json"