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BREW-SERVEIT-CVE-2020-25613 (GHSA-GWFG-CQMG-CF8F)

Vulnerability from osv_homebrew – Published: 2026-08-13 17:34 – Updated: 2026-08-13 17:34 – Source website
VLAI
Summary
WEBRick vulnerable to HTTP Request/Response Smuggling
Details

An issue was discovered in Ruby through 2.5.8, 2.6.x through 2.6.6, and 2.7.x through 2.7.1. WEBrick, a simple HTTP server bundled with Ruby, had not checked the transfer-encoding header value rigorously. An attacker may potentially exploit this issue to bypass a reverse proxy (which also has a poor header check), which may lead to an HTTP Request Smuggling attack.

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

{
  "affected": [
    {
      "ecosystem_specific": {
        "fix": "bump",
        "range_state": "fixed",
        "resource": "webrick",
        "resource_purl": "pkg:gem/webrick@1.8.1",
        "upstream_fixed_in": "1.6.1"
      },
      "package": {
        "ecosystem": "Homebrew",
        "name": "serveit",
        "purl": "pkg:brew/serveit"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.0.3_1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "confidence": "high",
    "source": "matched",
    "strategy": "registry",
    "upstream_evidence": [
      {
        "ecosystem": "RubyGems",
        "key": "pkg:gem/webrick@1.8.1",
        "name": "webrick",
        "resource": "webrick",
        "strategy": "registry",
        "subject_version": "1.8.1"
      }
    ]
  },
  "details": "An issue was discovered in Ruby through 2.5.8, 2.6.x through 2.6.6, and 2.7.x through 2.7.1. WEBrick, a simple HTTP server bundled with Ruby, had not checked the transfer-encoding header value rigorously. An attacker may potentially exploit this issue to bypass a reverse proxy (which also has a poor header check), which may lead to an HTTP Request Smuggling attack.",
  "id": "BREW-serveit-CVE-2020-25613",
  "modified": "2026-08-13T17:34:36Z",
  "published": "2026-08-13T17:34:36Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-25613"
    },
    {
      "type": "WEB",
      "url": "https://github.com/ruby/webrick/commit/076ac636bf48b7a492887ce4de7041de23e6c00d"
    },
    {
      "type": "WEB",
      "url": "https://github.com/ruby/webrick/commit/7618049fa57ddad2efff2a7bc7dad7d2d8a311b1"
    },
    {
      "type": "WEB",
      "url": "https://github.com/ruby/webrick/commit/8946bb38b4d87549f0d99ed73c62c41933f97cc7"
    },
    {
      "type": "WEB",
      "url": "https://github.com/ruby/webrick/commit/af2efdcdf826f25592202d187c53963e7932e4b9"
    },
    {
      "type": "WEB",
      "url": "https://hackerone.com/reports/965267"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/ruby/webrick"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rubysec/ruby-advisory-db/blob/master/gems/webrick/CVE-2020-25613.yml"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2023/04/msg00033.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PFP3E7KXXT3H3KA6CBZPUOGA5VPFARRJ"
    },
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YTZURYROG3FFED3TYCQOBV66BS4K6WOV"
    },
    {
      "type": "WEB",
      "url": "https://security.gentoo.org/glsa/202401-27"
    },
    {
      "type": "WEB",
      "url": "https://security.netapp.com/advisory/ntap-20210115-0008"
    },
    {
      "type": "WEB",
      "url": "https://www.ruby-lang.org/en/news/2020/09/29/http-request-smuggling-cve-2020-25613"
    }
  ],
  "schema_version": "1.7.3",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "WEBRick vulnerable to HTTP Request/Response Smuggling",
  "upstream": [
    "GHSA-gwfg-cqmg-cf8f",
    "BIT-ruby-2020-25613",
    "BIT-ruby-min-2020-25613",
    "CVE-2020-25613"
  ]
}



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