UBUNTU-CVE-2026-47737 (CVE-2026-47737)

Vulnerability from osv_ubuntu – Published: 2026-07-14 20:17 – Updated: 2026-10-17 09:44 – Source website
VLAI
Details

Puma is a Ruby/Rack web server built for parallelism. From 5.5.0 until 7.2.1 and 8.0.2, Puma is vulnerable to source IP spoofing when set_remote_address proxy_protocol: :v1 is enabled and persistent connections are used because Puma incorrectly re-parses PROXY protocol headers after each keep-alive request on the same connection, allowing an attacker to inject a second PROXY header and overwrite REMOTE_ADDR. This issue is fixed in versions 7.2.1 and 8.0.2.

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

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "puma",
            "binary_version": "3.12.4-1ubuntu2+esm2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "puma",
        "purl": "pkg:deb/ubuntu/puma@3.12.4-1ubuntu2+esm2?arch=source\u0026distro=esm-apps/focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.12.0-2ubuntu1",
        "3.12.0-4ubuntu1",
        "3.12.4-1ubuntu2",
        "3.12.4-1ubuntu2+esm1",
        "3.12.4-1ubuntu2+esm2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "puma",
            "binary_version": "5.5.2-2ubuntu2+esm2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:22.04:LTS",
        "name": "puma",
        "purl": "pkg:deb/ubuntu/puma@5.5.2-2ubuntu2+esm2?arch=source\u0026distro=esm-apps/jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "4.3.6-1ubuntu4",
        "5.5.2-2ubuntu2",
        "5.5.2-2ubuntu2+esm1",
        "5.5.2-2ubuntu2+esm2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "puma",
            "binary_version": "6.4.2-4ubuntu4.3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "puma",
        "purl": "pkg:deb/ubuntu/puma@6.4.2-4ubuntu4.3?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "5.6.5-4ubuntu2",
        "5.6.5-4ubuntu3",
        "6.4.2-4ubuntu1",
        "6.4.2-4ubuntu3",
        "6.4.2-4ubuntu4",
        "6.4.2-4ubuntu4.3"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "puma",
            "binary_version": "8.0.2-3build1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.10",
        "name": "puma",
        "purl": "pkg:deb/ubuntu/puma@8.0.2-3build1?arch=source\u0026distro=stonking"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "6.6.0-4build1",
        "8.0.2-3build1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "puma",
            "binary_version": "6.6.0-4build1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "puma",
        "purl": "pkg:deb/ubuntu/puma@6.6.0-4build1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "6.6.0-4",
        "6.6.0-4build1"
      ]
    }
  ],
  "aliases": [],
  "details": "Puma is a Ruby/Rack web server built for parallelism. From 5.5.0 until 7.2.1 and 8.0.2, Puma is vulnerable to source IP spoofing when set_remote_address proxy_protocol: :v1 is enabled and persistent connections are used because Puma incorrectly re-parses PROXY protocol headers after each keep-alive request on the same connection, allowing an attacker to inject a second PROXY header and overwrite REMOTE_ADDR. This issue is fixed in versions 7.2.1 and 8.0.2.",
  "id": "UBUNTU-CVE-2026-47737",
  "modified": "2026-10-17T09:44:18Z",
  "published": "2026-07-14T20:17:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-47737"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-47737"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/puma/puma/commit/439c6136d9c2275721b7864db3ee78af7c80889f"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/puma/puma/commit/ebe9db3929ab8299d19c8f5b41e8ef4f4b22fa58"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/puma/puma/pull/3944"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/puma/puma/pull/3947"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/puma/puma/releases/tag/v7.2.1"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/puma/puma/releases/tag/v8.0.2"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/puma/puma/security/advisories/GHSA-2vqw-3mp8-cgmx"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-47737"
  ]
}



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