UBUNTU-CVE-2026-8466

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Source
https://ubuntu.com/security/CVE-2026-8466
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-8466.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-8466
Upstream
  • CVE-2026-8466
Published
2026-05-13T19:17:00Z
Modified
2026-05-20T22:03:08.537922024Z
Severity
  • 8.2 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

Allocation of Resources Without Limits or Throttling vulnerability in ninenines cowboy allows denial of service via unbounded buffer accumulation in multipart header parsing. cowboyreq:readpart/3 in src/cowboyreq.erl accumulates incoming request bytes into a Buffer binary with no upper-bound check. When cowmultipart:parseheaders/2 returns more or {more, Buffer2}, the function reads up to Length bytes (default 64 KB) from the request body and recurses with the enlarged buffer. There is no equivalent of the bytesize(Acc) > Length guard present in the sibling function readpartbody/4. An unauthenticated attacker can send a multipart/form-data request whose body never yields a complete header section — for example, a body that never contains the advertised boundary delimiter, or one whose header lines never contain \r\n\r\n — and force the server process to accumulate memory linearly with the bytes the protocol layer is willing to deliver. A handful of concurrent such uploads is sufficient to exhaust BEAM memory. This issue affects cowboy from 2.0.0 before 2.15.0.

References

Affected packages

Ubuntu:16.04:LTS
erlang-cowboy

Package

Name
erlang-cowboy
Purl
pkg:deb/ubuntu/erlang-cowboy?arch=source&distro=xenial

Affected ranges

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

Affected versions

2.*
2.0.0~pre.1+dfsg1-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "erlang-cowboy",
            "binary_version": "2.0.0~pre.1+dfsg1-1"
        },
        {
            "binary_name": "erlang-cowboy-examples",
            "binary_version": "2.0.0~pre.1+dfsg1-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-8466.json"
Ubuntu:18.04:LTS
erlang-cowboy

Package

Name
erlang-cowboy
Purl
pkg:deb/ubuntu/erlang-cowboy?arch=source&distro=bionic

Affected ranges

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

Affected versions

2.*
2.0.0~pre.1+dfsg1-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "erlang-cowboy",
            "binary_version": "2.0.0~pre.1+dfsg1-2"
        },
        {
            "binary_name": "erlang-cowboy-examples",
            "binary_version": "2.0.0~pre.1+dfsg1-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-8466.json"
Ubuntu:20.04:LTS
erlang-cowboy

Package

Name
erlang-cowboy
Purl
pkg:deb/ubuntu/erlang-cowboy?arch=source&distro=focal

Affected ranges

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

Affected versions

2.*
2.0.0~pre.1+dfsg1-4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "erlang-cowboy",
            "binary_version": "2.0.0~pre.1+dfsg1-4"
        },
        {
            "binary_name": "erlang-cowboy-examples",
            "binary_version": "2.0.0~pre.1+dfsg1-4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-8466.json"
Ubuntu:22.04:LTS
erlang-cowboy

Package

Name
erlang-cowboy
Purl
pkg:deb/ubuntu/erlang-cowboy?arch=source&distro=jammy

Affected ranges

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

Affected versions

2.*
2.0.0~pre.1+dfsg1-4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "erlang-cowboy",
            "binary_version": "2.0.0~pre.1+dfsg1-4"
        },
        {
            "binary_name": "erlang-cowboy-examples",
            "binary_version": "2.0.0~pre.1+dfsg1-4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-8466.json"
Ubuntu:24.04:LTS
erlang-cowboy

Package

Name
erlang-cowboy
Purl
pkg:deb/ubuntu/erlang-cowboy?arch=source&distro=noble

Affected ranges

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

Affected versions

2.*
2.0.0~pre.1+dfsg1-4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "erlang-cowboy",
            "binary_version": "2.0.0~pre.1+dfsg1-4"
        },
        {
            "binary_name": "erlang-cowboy-examples",
            "binary_version": "2.0.0~pre.1+dfsg1-4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-8466.json"
Ubuntu:25.10
erlang-cowboy

Package

Name
erlang-cowboy
Purl
pkg:deb/ubuntu/erlang-cowboy?arch=source&distro=questing

Affected ranges

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

Affected versions

2.*
2.0.0~pre.1+dfsg1-4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "erlang-cowboy",
            "binary_version": "2.0.0~pre.1+dfsg1-4"
        },
        {
            "binary_name": "erlang-cowboy-examples",
            "binary_version": "2.0.0~pre.1+dfsg1-4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-8466.json"
Ubuntu:26.04:LTS
erlang-cowboy

Package

Name
erlang-cowboy
Purl
pkg:deb/ubuntu/erlang-cowboy?arch=source&distro=resolute

Affected ranges

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

Affected versions

2.*
2.0.0~pre.1+dfsg1-4
2.0.0~pre.1+dfsg1-4build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "erlang-cowboy",
            "binary_version": "2.0.0~pre.1+dfsg1-4build1"
        },
        {
            "binary_name": "erlang-cowboy-examples",
            "binary_version": "2.0.0~pre.1+dfsg1-4build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-8466.json"