PYSEC-2026-3080

Vulnerability from pysec - Published: 2026-07-13 15:19 - Updated: 2026-07-13 16:06
VLAI
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
Impacted products
Name purl
swift pkg:pypi/swift
Aliases
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "swift",
        "purl": "pkg:pypi/swift"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.36.0"
            },
            {
              "last_affected": "2.36.1"
            },
            {
              "introduced": "2.37.0"
            },
            {
              "last_affected": "2.37.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.36.0",
        "2.36.1",
        "2.37.0",
        "2.37.1"
      ]
    }
  ],
  "aliases": [
    "CVE-2026-49017",
    "GHSA-g7jq-j257-rww2"
  ],
  "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": "PYSEC-2026-3080",
  "modified": "2026-07-13T16:06:22.264690Z",
  "published": "2026-07-13T15:19:12.337104Z",
  "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"
    },
    {
      "type": "PACKAGE",
      "url": "https://pypi.org/project/swift"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-g7jq-j257-rww2"
    }
  ],
  "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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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.

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