UBUNTU-CVE-2026-59248

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Source
https://ubuntu.com/security/CVE-2026-59248
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-59248.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-59248
Upstream
Published
2026-07-28T10:16:00Z
Modified
2026-08-06T03:10:22Z
Severity
  • 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

Allocation of resources without limits vulnerability in ninenines cowlib allows an unauthenticated remote HTTP/2 or HTTP/3 peer to exhaust memory on the vulnerable server (or client) and cause a denial of service. The HPACK and QPACK prefixed-integer decoder cow_hpack_common:dec_big_int/3 in src/cow_hpack_common.hrl (invoked from cow_hpack:decode/2 in src/cow_hpack.erl and from cow_qpack:decode_field_section/3 in src/cow_qpack.erl) reads continuation octets until it sees one whose high bit is clear, evaluating Int + (Value bsl M) at each step with the shift M growing by seven per octet. No limit is enforced on the number of continuation octets, on the resulting bit width, or on the value; the decoder consumes whatever encoded length the peer supplies. Because Erlang integers are immutable, each intermediate Value bsl M and each accumulator update allocates a fresh bignum whose digit width grows linearly with the number of octets processed so far. Summed across the whole decode, the transient bignum digit materialization is on the order of the square of the encoded length. A single maximal HPACK indexed representation carried inside one HTTP/2 HEADERS plus one CONTINUATION frame at Cowboy's default max_frame_size_received can force hundreds of megabytes of transient allocation and garbage-collection churn before the resulting header-table index is rejected as invalid. Repeated or concurrent connections multiply the pressure and can drive the Erlang VM to memory exhaustion. Cowlib is the HTTP parser used by Cowboy, RabbitMQ's management plugin, and other Erlang and Elixir HTTP/2 and HTTP/3 servers and clients, so any exposed endpoint that accepts HPACK or QPACK from an untrusted peer is reachable. This issue affects cowlib: from 2.0.0 before 2.19.0.

References

Affected packages

Ubuntu:16.04:LTS
erlang-cowlib

Package

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

Affected ranges

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

Affected versions

1.*
1.3.0-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "erlang-cowlib",
            "binary_version": "1.3.0-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-59248.json"
Ubuntu:18.04:LTS
rabbitmq-server

Package

Name
rabbitmq-server
Purl
pkg:deb/ubuntu/rabbitmq-server?arch=source&distro=bionic

Affected ranges

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

Affected versions

3.*
3.6.10-1
3.6.10-1ubuntu0.1
3.6.10-1ubuntu0.3
3.6.10-1ubuntu0.4
3.6.10-1ubuntu0.5

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "rabbitmq-server",
            "binary_version": "3.6.10-1ubuntu0.5"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-59248.json"
erlang-cowlib

Package

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

Affected ranges

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

Affected versions

1.*
1.3.0-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "erlang-cowlib",
            "binary_version": "1.3.0-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-59248.json"
Ubuntu:20.04:LTS
rabbitmq-server

Package

Name
rabbitmq-server
Purl
pkg:deb/ubuntu/rabbitmq-server?arch=source&distro=focal

Affected ranges

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

Affected versions

3.*
3.7.8-4ubuntu2
3.7.18-1
3.8.2-0ubuntu1
3.8.2-0ubuntu1.1
3.8.2-0ubuntu1.2
3.8.2-0ubuntu1.3
3.8.2-0ubuntu1.4
3.8.2-0ubuntu1.5
3.8.3-0ubuntu0.1
3.8.3-0ubuntu0.2
3.8.3-0ubuntu0.3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "rabbitmq-server",
            "binary_version": "3.8.3-0ubuntu0.3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-59248.json"
erlang-cowlib

Package

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

Affected ranges

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

Affected versions

1.*
1.3.0-3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "erlang-cowlib",
            "binary_version": "1.3.0-3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-59248.json"
Ubuntu:22.04:LTS
erlang-cowlib

Package

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

Affected ranges

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

Affected versions

1.*
1.3.0-3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "erlang-cowlib",
            "binary_version": "1.3.0-3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-59248.json"
rabbitmq-server

Package

Name
rabbitmq-server
Purl
pkg:deb/ubuntu/rabbitmq-server?arch=source&distro=jammy

Affected ranges

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

Affected versions

3.*
3.8.9-3ubuntu1
3.9.8-1
3.9.8-2
3.9.8-3
3.9.8-5
3.9.8-6
3.9.13-1
3.9.13-1ubuntu0.22.04.1
3.9.13-1ubuntu0.22.04.2
3.9.27-0ubuntu0.1
3.9.27-0ubuntu0.2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "rabbitmq-server",
            "binary_version": "3.9.27-0ubuntu0.2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-59248.json"
Ubuntu:24.04:LTS
erlang-cowlib

Package

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

Affected ranges

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

Affected versions

1.*
1.3.0-3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "erlang-cowlib",
            "binary_version": "1.3.0-3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-59248.json"
rabbitmq-server

Package

Name
rabbitmq-server
Purl
pkg:deb/ubuntu/rabbitmq-server?arch=source&distro=noble

Affected ranges

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

Affected versions

3.*
3.12.1-1
3.12.1-1ubuntu1
3.12.1-1ubuntu1.2
3.12.1-1ubuntu1.4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "rabbitmq-server",
            "binary_version": "3.12.1-1ubuntu1.4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-59248.json"
Ubuntu:26.04:LTS
erlang-cowlib

Package

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

Affected ranges

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

Affected versions

1.*
1.3.0-3
1.3.0-3build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "erlang-cowlib",
            "binary_version": "1.3.0-3build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-59248.json"
rabbitmq-server

Package

Name
rabbitmq-server
Purl
pkg:deb/ubuntu/rabbitmq-server?arch=source&distro=resolute

Affected ranges

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

Affected versions

4.*
4.0.5-8ubuntu2
4.0.5-10ubuntu1
4.0.5-10ubuntu2
4.0.5-10ubuntu3
4.0.5-10ubuntu4
4.0.5-10ubuntu5

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "rabbitmq-server",
            "binary_version": "4.0.5-10ubuntu5"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-59248.json"
Ubuntu:Pro:16.04:LTS
rabbitmq-server

Package

Name
rabbitmq-server
Purl
pkg:deb/ubuntu/rabbitmq-server?arch=source&distro=esm-infra%2Fxenial

Affected ranges

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

Affected versions

3.*
3.5.4-1
3.5.4-3
3.5.4-3.1
3.5.7-1
3.5.7-1ubuntu0.16.04.1
3.5.7-1ubuntu0.16.04.2
3.5.7-1ubuntu0.16.04.4
3.5.7-1ubuntu0.16.04.4+esm1
3.5.7-1ubuntu0.16.04.4+esm2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "rabbitmq-server",
            "binary_version": "3.5.7-1ubuntu0.16.04.4+esm2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-59248.json"