ubuntu-cve-2026-32240
Vulnerability from osv_ubuntu
Published
2026-03-12 20:16
Modified
2026-08-19 21:35
Summary
Details
Cap'n Proto is a data interchange format and capability-based RPC system. Prior to 1.4.0, when using Transfer-Encoding: chunked, if a chunk's size parsed to a value of 2^64 or larger, it would be truncated to a 64-bit integer. In theory, this bug could enable HTTP request/response smuggling. This vulnerability is fixed in 1.4.0.
Severity
6.5 (Medium)
N/A (UNKNOWN)
References
{
"affected": [
{
"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"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:18.04:LTS",
"name": "capnproto",
"purl": "pkg:deb/ubuntu/capnproto@0.6.1-1ubuntu1+esm1?arch=source\u0026distro=esm-infra/bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "0.6.1-1ubuntu1+esm1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"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": "0.7.0-6ubuntu0.1~esm1"
},
{
"binary_name": "libcapnp-0.7.0",
"binary_version": "0.7.0-6ubuntu0.1~esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:20.04:LTS",
"name": "capnproto",
"purl": "pkg:deb/ubuntu/capnproto@0.7.0-6ubuntu0.1~esm1?arch=source\u0026distro=esm-infra/focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "0.7.0-6ubuntu0.1~esm1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.7.0-5",
"0.7.0-5build1",
"0.7.0-6"
]
},
{
"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"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:22.04:LTS",
"name": "capnproto",
"purl": "pkg:deb/ubuntu/capnproto@0.8.0-2ubuntu2+esm1?arch=source\u0026distro=esm-apps/jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "0.8.0-2ubuntu2+esm1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"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": "1.0.1-4ubuntu0.1~esm1"
},
{
"binary_name": "libcapnp-1.0.1",
"binary_version": "1.0.1-4ubuntu0.1~esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:24.04:LTS",
"name": "capnproto",
"purl": "pkg:deb/ubuntu/capnproto@1.0.1-4ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.0.1-4ubuntu0.1~esm1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.9.2-3",
"1.0.1-2",
"1.0.1-3",
"1.0.1-4"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "capnproto",
"binary_version": "1.1.0-2"
},
{
"binary_name": "libcapnp-1.1.0",
"binary_version": "1.1.0-2"
}
]
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "capnproto",
"purl": "pkg:deb/ubuntu/capnproto@1.1.0-2?arch=source\u0026distro=questing"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.1.0-2"
]
},
{
"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"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:26.04:LTS",
"name": "capnproto",
"purl": "pkg:deb/ubuntu/capnproto@1.1.0-2.1ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.1.0-2.1ubuntu0.1~esm1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.1.0-2",
"1.1.0-2.1"
]
}
],
"aliases": [],
"details": "Cap\u0027n Proto is a data interchange format and capability-based RPC system. Prior to 1.4.0, when using Transfer-Encoding: chunked, if a chunk\u0027s size parsed to a value of 2^64 or larger, it would be truncated to a 64-bit integer. In theory, this bug could enable HTTP request/response smuggling. This vulnerability is fixed in 1.4.0.",
"id": "UBUNTU-CVE-2026-32240",
"modified": "2026-08-19T21:35:22Z",
"published": "2026-03-12T20:16:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-32240"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-32240"
},
{
"type": "REPORT",
"url": "https://github.com/capnproto/capnproto/security/advisories/GHSA-vpcq-mx5v-32wm"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-8650-1"
}
],
"related": [
"USN-8650-1"
],
"schema_version": "1.7.0",
"severity": [
{
"score": "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",
"type": "CVSS_V4"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-32240"
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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