UBUNTU-CVE-2026-115866

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Source
https://ubuntu.com/security/CVE-2026-115866
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-115866.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-115866
Upstream
Published
2026-11-03T00:00:00Z
Modified
2026-11-04T03:30:24Z
Severity
  • Ubuntu - medium
Summary
[none]
Details

Starlet versions from 0.20 before 0.33 for Perl allow CPU exhaustion via regular expression backtracking when decoding chunked request bodies. A chunk-size line is matched as a run of hex digits, then .* and a CRLF. A run followed by a bare LF and then a CRLF can never match, and the engine retries the match once for each digit, so the time taken grows with the square of the run length. Nothing limits the length of the run, which can span several reads. A remote attacker can occupy a worker for about a minute of CPU time with one 128 KiB request, before the application is called.

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
0 Unknown introduced version / All previous versions are affected

Affected versions

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

Ecosystem specific 

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

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-115866.json"
Ubuntu:18.04:LTS
starlet

Package

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

Affected ranges

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

Affected versions

0.*
0.31-1

Ecosystem specific 

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

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-115866.json"
Ubuntu:20.04:LTS
starlet

Package

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

Affected ranges

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

Affected versions

0.*
0.31-1

Ecosystem specific 

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

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-115866.json"
Ubuntu:22.04:LTS
starlet

Package

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

Affected ranges

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

Affected versions

0.*
0.31-1.1

Ecosystem specific 

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

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-115866.json"
Ubuntu:24.04:LTS
starlet

Package

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

Affected ranges

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

Affected versions

0.*
0.31-2

Ecosystem specific 

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

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-115866.json"
Ubuntu:26.04:LTS
starlet

Package

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

Affected ranges

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

Affected versions

0.*
0.31-2
0.31-2build1

Ecosystem specific 

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

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-115866.json"
Ubuntu:26.10
starlet

Package

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

Affected ranges

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

Affected versions

0.*
0.31-2build1
0.31-3
0.32-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "starlet",
            "binary_version": "0.32-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-115866.json"