GHSA-G7JQ-J257-RWW2

Vulnerability from github – Published: 2026-05-27 03:30 – Updated: 2026-07-01 18:04
VLAI
Summary
OpenStack Swift: s3api middleware enters an infinite loop when processing a truncated aws-chunked PUT request body
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
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{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "swift"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.36.0"
            },
            {
              "last_affected": "2.36.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "swift"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.37.0"
            },
            {
              "last_affected": "2.37.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-49017"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-835"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-01T18:04:11Z",
    "nvd_published_at": "2026-05-27T02:16:34Z",
    "severity": "HIGH"
  },
  "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": "GHSA-g7jq-j257-rww2",
  "modified": "2026-07-01T18:04:11Z",
  "published": "2026-05-27T03:30:31Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-49017"
    },
    {
      "type": "WEB",
      "url": "https://bugs.launchpad.net/bugs/2152205"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/openstack/swift"
    },
    {
      "type": "WEB",
      "url": "https://review.opendev.org/c/openstack/swift/+/987957"
    },
    {
      "type": "WEB",
      "url": "https://review.opendev.org/c/openstack/swift/+/988093"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/05/27/9"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/06/02/6"
    }
  ],
  "schema_version": "1.4.0",
  "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"
    }
  ],
  "summary": "OpenStack Swift: s3api middleware enters an infinite loop when processing a truncated aws-chunked PUT request body"
}


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