ubuntu-cve-2026-49017
Vulnerability from osv_ubuntu
Published
2026-05-27 02:16
Modified
2026-06-09 19:28
Summary
Details

In OpenStack Swift before 2.36.2 and 2.37.2, s3api middleware enters an infinite loop when processing a truncated aws-chunked PUT request body. The StreamingInput class repeatedly appends an empty buffer and re-reads, causing the proxy-server worker handling the request to become permanently unresponsive with increasing CPU and memory consumption. An authenticated attacker can systematically exhaust all proxy-server workers, resulting in denial of service. The defect was introduced in Swift 2.36.0.

Severity
7.1 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python3-swift",
            "binary_version": "2.36.0-0ubuntu1.1"
          },
          {
            "binary_name": "swift",
            "binary_version": "2.36.0-0ubuntu1.1"
          },
          {
            "binary_name": "swift-account",
            "binary_version": "2.36.0-0ubuntu1.1"
          },
          {
            "binary_name": "swift-container",
            "binary_version": "2.36.0-0ubuntu1.1"
          },
          {
            "binary_name": "swift-object",
            "binary_version": "2.36.0-0ubuntu1.1"
          },
          {
            "binary_name": "swift-object-expirer",
            "binary_version": "2.36.0-0ubuntu1.1"
          },
          {
            "binary_name": "swift-proxy",
            "binary_version": "2.36.0-0ubuntu1.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "swift",
        "purl": "pkg:deb/ubuntu/swift@2.36.0-0ubuntu1.1?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.35.0-0ubuntu1",
        "2.35.0+git2025070714.1428eb3b5-0ubuntu1",
        "2.36.0-0ubuntu1",
        "2.36.0-0ubuntu1.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python3-swift",
            "binary_version": "2.37.1-0ubuntu2"
          },
          {
            "binary_name": "swift",
            "binary_version": "2.37.1-0ubuntu2"
          },
          {
            "binary_name": "swift-account",
            "binary_version": "2.37.1-0ubuntu2"
          },
          {
            "binary_name": "swift-container",
            "binary_version": "2.37.1-0ubuntu2"
          },
          {
            "binary_name": "swift-object",
            "binary_version": "2.37.1-0ubuntu2"
          },
          {
            "binary_name": "swift-object-expirer",
            "binary_version": "2.37.1-0ubuntu2"
          },
          {
            "binary_name": "swift-proxy",
            "binary_version": "2.37.1-0ubuntu2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "swift",
        "purl": "pkg:deb/ubuntu/swift@2.37.1-0ubuntu2?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.36.0-0ubuntu1",
        "2.37.0-0ubuntu1",
        "2.37.1-0ubuntu2"
      ]
    }
  ],
  "aliases": [],
  "details": "In OpenStack Swift before 2.36.2 and 2.37.2, s3api middleware enters an infinite loop when processing a truncated aws-chunked PUT request body. The StreamingInput class repeatedly appends an empty buffer and re-reads, causing the proxy-server worker handling the request to become permanently unresponsive with increasing CPU and memory consumption. An authenticated attacker can systematically exhaust all proxy-server workers, resulting in denial of service. The defect was introduced in Swift 2.36.0.",
  "id": "UBUNTU-CVE-2026-49017",
  "modified": "2026-06-09T19:28:32Z",
  "published": "2026-05-27T02:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-49017"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-49017"
    },
    {
      "type": "REPORT",
      "url": "https://bugs.launchpad.net/bugs/2152205"
    },
    {
      "type": "REPORT",
      "url": "https://review.opendev.org/c/openstack/swift/+/987957"
    },
    {
      "type": "REPORT",
      "url": "https://review.opendev.org/c/openstack/swift/+/988093"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L",
      "type": "CVSS_V4"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-49017"
  ]
}



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