ubuntu-cve-2026-32239
Vulnerability from osv_ubuntu
Published
2026-03-12 20:16
Modified
2026-05-20 15:27
Summary
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.

Severity
6.3 (Medium)
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
6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "capnproto",
            "binary_version": "0.4.0-1ubuntu2.1"
          },
          {
            "binary_name": "libcapnp-0.4.0",
            "binary_version": "0.4.0-1ubuntu2.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:14.04:LTS",
        "name": "capnproto",
        "purl": "pkg:deb/ubuntu/capnproto@0.4.0-1ubuntu2.1?arch=source\u0026distro=trusty"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.2.1-1",
        "0.4.0~git20131030+e7d2778-0ubuntu1",
        "0.4.0-1ubuntu1",
        "0.4.0-1ubuntu2",
        "0.4.0-1ubuntu2.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "capnproto",
            "binary_version": "0.5.3-2ubuntu1.1"
          },
          {
            "binary_name": "libcapnp-0.5.3",
            "binary_version": "0.5.3-2ubuntu1.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "capnproto",
        "purl": "pkg:deb/ubuntu/capnproto@0.5.3-2ubuntu1.1?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.4.0-1ubuntu3",
        "0.5.3-2ubuntu1",
        "0.5.3-2ubuntu1.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "capnproto",
            "binary_version": "0.6.1-1ubuntu1"
          },
          {
            "binary_name": "libcapnp-0.6.1",
            "binary_version": "0.6.1-1ubuntu1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "capnproto",
        "purl": "pkg:deb/ubuntu/capnproto@0.6.1-1ubuntu1?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.5.3-2ubuntu2",
        "0.6.1-1",
        "0.6.1-1ubuntu1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "capnproto",
            "binary_version": "0.7.0-6"
          },
          {
            "binary_name": "libcapnp-0.7.0",
            "binary_version": "0.7.0-6"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "capnproto",
        "purl": "pkg:deb/ubuntu/capnproto@0.7.0-6?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.7.0-5",
        "0.7.0-5build1",
        "0.7.0-6"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "capnproto",
            "binary_version": "0.8.0-2ubuntu2"
          },
          {
            "binary_name": "libcapnp-0.8.0",
            "binary_version": "0.8.0-2ubuntu2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "capnproto",
        "purl": "pkg:deb/ubuntu/capnproto@0.8.0-2ubuntu2?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.7.0-7build1",
        "0.8.0-2ubuntu2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "capnproto",
            "binary_version": "1.0.1-4"
          },
          {
            "binary_name": "libcapnp-1.0.1",
            "binary_version": "1.0.1-4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "capnproto",
        "purl": "pkg:deb/ubuntu/capnproto@1.0.1-4?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "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": {
        "binaries": [
          {
            "binary_name": "capnproto",
            "binary_version": "1.1.0-2.1"
          },
          {
            "binary_name": "libcapnp-1.1.0",
            "binary_version": "1.1.0-2.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "capnproto",
        "purl": "pkg:deb/ubuntu/capnproto@1.1.0-2.1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "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, 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.",
  "id": "UBUNTU-CVE-2026-32239",
  "modified": "2026-05-20T15:27:20Z",
  "published": "2026-03-12T20:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-32239"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-32239"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/capnproto/capnproto/security/advisories/GHSA-qjx3-pp3m-9jpm"
    }
  ],
  "related": [],
  "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-2026-32239"
  ]
}



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Sightings

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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.
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  • 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.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.