ubuntu-cve-2026-5440
Vulnerability from osv_ubuntu
Published
2026-04-09 15:16
Modified
2026-05-20 15:24
Summary
Details

A memory exhaustion vulnerability exists in the HTTP server due to unbounded use of the Content-Length header. The server allocates memory directly based on the attacker supplied header value without enforcing an upper limit. A crafted HTTP request containing an extremely large Content-Length value can trigger excessive memory allocation and server termination, even without sending a request body.

Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "orthanc",
            "binary_version": "1.0.0+dfsg-1build1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "orthanc",
        "purl": "pkg:deb/ubuntu/orthanc@1.0.0+dfsg-1build1?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.9.4+dfsg-1",
        "0.9.4+dfsg-2",
        "0.9.5+dfsg-1",
        "1.0.0+dfsg-1",
        "1.0.0+dfsg-1build1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "orthanc",
            "binary_version": "1.3.1+dfsg-1build2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "orthanc",
        "purl": "pkg:deb/ubuntu/orthanc@1.3.1+dfsg-1build2?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.3.0+dfsg-1build1",
        "1.3.0+dfsg-1build2",
        "1.3.1+dfsg-1",
        "1.3.1+dfsg-1build1",
        "1.3.1+dfsg-1build2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "orthanc",
            "binary_version": "1.5.8+dfsg-2ubuntu6"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "orthanc",
        "purl": "pkg:deb/ubuntu/orthanc@1.5.8+dfsg-2ubuntu6?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.5.7+dfsg-2",
        "1.5.8+dfsg-2",
        "1.5.8+dfsg-2ubuntu2",
        "1.5.8+dfsg-2ubuntu3",
        "1.5.8+dfsg-2ubuntu4",
        "1.5.8+dfsg-2ubuntu5",
        "1.5.8+dfsg-2ubuntu6"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "liborthancframework1",
            "binary_version": "1.10.0+dfsg-1"
          },
          {
            "binary_name": "orthanc",
            "binary_version": "1.10.0+dfsg-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "orthanc",
        "purl": "pkg:deb/ubuntu/orthanc@1.10.0+dfsg-1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.9.2+really1.9.1+dfsg-1",
        "1.9.7+dfsg-3ubuntu1",
        "1.9.7+dfsg-3ubuntu2",
        "1.9.7+dfsg-4",
        "1.9.7+dfsg-5",
        "1.9.7+dfsg-6",
        "1.10.0+dfsg-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "liborthancframework1",
            "binary_version": "1.12.2+dfsg-1build4"
          },
          {
            "binary_name": "orthanc",
            "binary_version": "1.12.2+dfsg-1build4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "orthanc",
        "purl": "pkg:deb/ubuntu/orthanc@1.12.2+dfsg-1build4?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.12.1+dfsg-3",
        "1.12.1+dfsg-4",
        "1.12.1+dfsg-4build1",
        "1.12.2+dfsg-1",
        "1.12.2+dfsg-1build3",
        "1.12.2+dfsg-1build4"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "liborthancframework1",
            "binary_version": "1.12.7+dfsg-4build2"
          },
          {
            "binary_name": "orthanc",
            "binary_version": "1.12.7+dfsg-4build2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "orthanc",
        "purl": "pkg:deb/ubuntu/orthanc@1.12.7+dfsg-4build2?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.12.6+dfsg-1",
        "1.12.7+dfsg-4",
        "1.12.7+dfsg-4build2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "liborthancframework1",
            "binary_version": "1.12.10+dfsg-2"
          },
          {
            "binary_name": "orthanc",
            "binary_version": "1.12.10+dfsg-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "orthanc",
        "purl": "pkg:deb/ubuntu/orthanc@1.12.10+dfsg-2?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.12.7+dfsg-4build2",
        "1.12.9+dfsg-2",
        "1.12.10+dfsg-1",
        "1.12.10+dfsg-1build1",
        "1.12.10+dfsg-2"
      ]
    }
  ],
  "aliases": [],
  "details": "A memory exhaustion vulnerability exists in the HTTP server due to unbounded use of the `Content-Length` header.  The server allocates memory directly based on the attacker supplied header value without enforcing an upper limit. A crafted HTTP request containing an extremely large `Content-Length` value can trigger excessive memory allocation and server termination, even without sending a request body.",
  "id": "UBUNTU-CVE-2026-5440",
  "modified": "2026-05-20T15:24:32Z",
  "published": "2026-04-09T15:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-5440"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-5440"
    },
    {
      "type": "REPORT",
      "url": "https://kb.cert.org/vuls/id/536588"
    },
    {
      "type": "REPORT",
      "url": "https://www.machinespirits.de/"
    },
    {
      "type": "REPORT",
      "url": "https://www.orthanc-server.com/"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-5440"
  ]
}



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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

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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.
  • 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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