FKIE_CVE-2026-47737

Vulnerability from fkie_nvd - Published: 2026-07-14 20:17 - Updated: 2026-07-15 15:16
Severity
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Summary
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.
References
security-advisories@github.comhttps://github.com/puma/puma/commit/439c6136d9c2275721b7864db3ee78af7c80889f
security-advisories@github.comhttps://github.com/puma/puma/commit/ebe9db3929ab8299d19c8f5b41e8ef4f4b22fa58
security-advisories@github.comhttps://github.com/puma/puma/pull/3944
security-advisories@github.comhttps://github.com/puma/puma/pull/3947
security-advisories@github.comhttps://github.com/puma/puma/releases/tag/v7.2.1
security-advisories@github.comhttps://github.com/puma/puma/releases/tag/v8.0.2
security-advisories@github.comhttps://github.com/puma/puma/security/advisories/GHSA-2vqw-3mp8-cgmx
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "puma",
          "vendor": "puma",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 5.5.0, \u003c 7.2.1"
            },
            {
              "status": "affected",
              "version": "\u003e= 8.0.0, \u003c 8.0.2"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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": "CVE-2026-47737",
  "lastModified": "2026-07-15T15:16:35.253",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-47737",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-07-15T14:10:11.985537Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-07-14T20:17:03.767",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/puma/puma/commit/439c6136d9c2275721b7864db3ee78af7c80889f"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/puma/puma/commit/ebe9db3929ab8299d19c8f5b41e8ef4f4b22fa58"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/puma/puma/pull/3944"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/puma/puma/pull/3947"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/puma/puma/releases/tag/v7.2.1"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/puma/puma/releases/tag/v8.0.2"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/puma/puma/security/advisories/GHSA-2vqw-3mp8-cgmx"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-290"
        },
        {
          "lang": "en",
          "value": "CWE-345"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}



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