Vulnerability-Lookup

UBUNTU-CVE-2026-49017 (CVE-2026-49017)

Vulnerability from osv_ubuntu – Published: 2026-05-27 02:16 – Updated: 2026-06-09 19:28 – Source website

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

URL

Type

	https://ubuntu.com/security/CVE-2026-49017	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-49017	REPORT
	https://bugs.launchpad.net/bugs/2152205	REPORT
	https://review.opendev.org/c/openstack/swift/+/987957	REPORT
	https://review.opendev.org/c/openstack/swift/+/988093	REPORT

JSON

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"
  ]
}

CVE-2026-49017 (GCVE-0-2026-49017)

Vulnerability from cvelistv5 – Published: 2026-05-27 01:57 – Updated: 2026-06-02 17:33

Summary

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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-27 13:52 UTC

CWE

CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')

Assigner

mitre mitre root

References

5 references

URL	Tags
https://bugs.launchpad.net/bugs/2152205	issue-tracking
https://review.opendev.org/c/openstack/swift/+/987957	patch
https://review.opendev.org/c/openstack/swift/+/988093	technical-description
http://www.openwall.com/lists/oss-security/2026/05/27/9
http://www.openwall.com/lists/oss-security/2026/06/02/6

Impacted products

1 product

Vendor	Product	Version
OpenStack	Swift	Affected: 2.36.0 , < 2.36.2 (semver) Affected: 2.37.0 , < 2.37.2 (semver) Affected: 2.35.1 , < 2.35.3 (semver) cpe:2.3:a:openstack:swift:::::::: cpe:2.3:a:openstack:swift:::::::: cpe:2.3:a:openstack:swift::::::::

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
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        "metrics": [
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                "id": "CVE-2026-49017",
                "options": [
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                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-05-27T13:52:48.762325Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-05-27T13:52:55.767Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
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        "providerMetadata": {
          "dateUpdated": "2026-06-02T17:33:08.620Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
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        "references": [
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            "url": "http://www.openwall.com/lists/oss-security/2026/05/27/9"
          },
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            "url": "http://www.openwall.com/lists/oss-security/2026/06/02/6"
          }
        ],
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    "cna": {
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        {
          "defaultStatus": "unaffected",
          "product": "Swift",
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          "vendor": "OpenStack",
          "versions": [
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              "lessThan": "2.36.2",
              "status": "affected",
              "version": "2.36.0",
              "versionType": "semver"
            },
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              "lessThan": "2.37.2",
              "status": "affected",
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              "versionType": "semver"
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            {
              "lessThan": "2.35.3",
              "status": "affected",
              "version": "2.35.1",
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      "cpeApplicability": [
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      ],
      "metrics": [
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            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
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            "providerUrgency": "NOT_DEFINED",
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            "valueDensity": "NOT_DEFINED",
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    "datePublished": "2026-05-27T01:57:58.831Z",
    "dateReserved": "2026-05-27T01:57:58.189Z",
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    "state": "PUBLISHED"
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}

Sightings

Author	Source	Type	Date	Other

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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UBUNTU-CVE-2026-49017 (CVE-2026-49017)

CVE-2026-49017 (GCVE-0-2026-49017)

Tags

Sightings

Nomenclature

Related by attack behaviour