UBUNTU-CVE-2026-32239

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Source
https://ubuntu.com/security/CVE-2026-32239
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-32239.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-32239
Upstream
Downstream
Related
Published
2026-03-12T20:16:00Z
Modified
2026-08-20T00:00:12Z
Severity
  • 6.3 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N CVSS Calculator
  • 6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

Cap'n Proto is a data interchange format and capability-based RPC system. Prior to 1.4.0, a negative Content-Length value was converted to unsigned, treating it as an impossibly large length instead. In theory, this bug could enable HTTP request/response smuggling. This vulnerability is fixed in 1.4.0.

References

Affected packages

Ubuntu:25.10
capnproto

Package

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

Affected ranges

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

Affected versions

1.*
1.1.0-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "capnproto",
            "binary_version": "1.1.0-2"
        },
        {
            "binary_name": "libcapnp-1.1.0",
            "binary_version": "1.1.0-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-32239.json"
Ubuntu:Pro:18.04:LTS
capnproto

Package

Name
capnproto
Purl
pkg:deb/ubuntu/capnproto?arch=source&distro=esm-infra%2Fbionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
0.6.1-1ubuntu1+esm1

Affected versions

0.*
0.5.3-2ubuntu2
0.6.1-1
0.6.1-1ubuntu1

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "capnproto",
            "binary_version": "0.6.1-1ubuntu1+esm1"
        },
        {
            "binary_name": "libcapnp-0.6.1",
            "binary_version": "0.6.1-1ubuntu1+esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-32239.json"
Ubuntu:Pro:20.04:LTS
capnproto

Package

Name
capnproto
Purl
pkg:deb/ubuntu/capnproto?arch=source&distro=esm-infra%2Ffocal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
0.7.0-6ubuntu0.1~esm1

Affected versions

0.*
0.7.0-5
0.7.0-5build1
0.7.0-6

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "capnproto",
            "binary_version": "0.7.0-6ubuntu0.1~esm1"
        },
        {
            "binary_name": "libcapnp-0.7.0",
            "binary_version": "0.7.0-6ubuntu0.1~esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-32239.json"
Ubuntu:Pro:22.04:LTS
capnproto

Package

Name
capnproto
Purl
pkg:deb/ubuntu/capnproto?arch=source&distro=esm-apps%2Fjammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
0.8.0-2ubuntu2+esm1

Affected versions

0.*
0.7.0-7build1
0.8.0-2ubuntu2

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "capnproto",
            "binary_version": "0.8.0-2ubuntu2+esm1"
        },
        {
            "binary_name": "libcapnp-0.8.0",
            "binary_version": "0.8.0-2ubuntu2+esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-32239.json"
Ubuntu:Pro:24.04:LTS
capnproto

Package

Name
capnproto
Purl
pkg:deb/ubuntu/capnproto?arch=source&distro=esm-apps%2Fnoble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1.0.1-4ubuntu0.1~esm1

Affected versions

0.*
0.9.2-3
1.*
1.0.1-2
1.0.1-3
1.0.1-4

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "capnproto",
            "binary_version": "1.0.1-4ubuntu0.1~esm1"
        },
        {
            "binary_name": "libcapnp-1.0.1",
            "binary_version": "1.0.1-4ubuntu0.1~esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-32239.json"
Ubuntu:Pro:26.04:LTS
capnproto

Package

Name
capnproto
Purl
pkg:deb/ubuntu/capnproto?arch=source&distro=esm-apps%2Fresolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1.1.0-2.1ubuntu0.1~esm1

Affected versions

1.*
1.1.0-2
1.1.0-2.1

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "capnproto",
            "binary_version": "1.1.0-2.1ubuntu0.1~esm1"
        },
        {
            "binary_name": "libcapnp-1.1.0",
            "binary_version": "1.1.0-2.1ubuntu0.1~esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-32239.json"