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BREW-TRAVIS-CVE-2022-30123 (GHSA-WQ4H-7R42-5HRR)

Vulnerability from osv_homebrew – Published: 2026-08-13 17:44 – Updated: 2026-08-13 17:44 – Source website
VLAI
Summary
Possible shell escape sequence injection vulnerability in Rack
Details

There is a possible shell escape sequence injection vulnerability in the Lint and CommonLogger components of Rack. This vulnerability has been assigned the CVE identifier CVE-2022-30123.

Versions Affected: All. Not affected: None Fixed Versions: 2.0.9.1, 2.1.4.1, 2.2.3.1

Impact

Carefully crafted requests can cause shell escape sequences to be written to the terminal via Rack's Lint middleware and CommonLogger middleware. These escape sequences can be leveraged to possibly execute commands in the victim's terminal.

Impacted applications will have either of these middleware installed, and vulnerable apps may have something like this:

use Rack::Lint

Or

use Rack::CommonLogger

All users running an affected release should either upgrade or use one of the workarounds immediately.

Workarounds

Remove these middleware from your application

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

{
  "affected": [
    {
      "ecosystem_specific": {
        "fix": "bump",
        "range_state": "fixed",
        "resource": "rack",
        "resource_purl": "pkg:gem/rack@3.0.11",
        "upstream_fixed_in": "2.2.3.1"
      },
      "package": {
        "ecosystem": "Homebrew",
        "name": "travis",
        "purl": "pkg:brew/travis"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.14.0_2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "confidence": "high",
    "source": "matched",
    "strategy": "registry",
    "upstream_evidence": [
      {
        "ecosystem": "RubyGems",
        "key": "pkg:gem/rack@3.0.11",
        "name": "rack",
        "resource": "rack",
        "strategy": "registry",
        "subject_version": "3.0.11"
      }
    ]
  },
  "details": "There is a possible shell escape sequence injection vulnerability in the Lint\nand CommonLogger components of Rack.  This vulnerability has been assigned the\nCVE identifier CVE-2022-30123.\n\nVersions Affected:  All.\nNot affected:       None\nFixed Versions:     2.0.9.1, 2.1.4.1, 2.2.3.1\n\n## Impact\nCarefully crafted requests can cause shell escape sequences to be written to\nthe terminal via Rack\u0027s Lint middleware and CommonLogger middleware.  These\nescape sequences can be leveraged to possibly execute commands in the victim\u0027s\nterminal.\n\nImpacted applications will have either of these middleware installed, and\nvulnerable apps may have something like this:\n\n```\nuse Rack::Lint\n```\n\nOr\n\n```\nuse Rack::CommonLogger\n```\n\nAll users running an affected release should either upgrade or use one of the\nworkarounds immediately.\n\n## Workarounds\nRemove these middleware from your application\n",
  "id": "BREW-travis-CVE-2022-30123",
  "modified": "2026-08-13T17:44:53Z",
  "published": "2026-08-13T17:44:53Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-30123"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rack/rack/commit/b426cc224908ec6ed6eb8729325392b048215d88"
    },
    {
      "type": "WEB",
      "url": "https://discuss.rubyonrails.org/t/cve-2022-30123-possible-shell-escape-sequence-injection-vulnerability-in-rack/80728"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/rack/rack"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rubysec/ruby-advisory-db/blob/master/gems/rack/CVE-2022-30123.yml"
    },
    {
      "type": "WEB",
      "url": "https://groups.google.com/g/ruby-security-ann/c/LWB10kWzag8"
    },
    {
      "type": "WEB",
      "url": "https://security.gentoo.org/glsa/202310-18"
    },
    {
      "type": "WEB",
      "url": "https://security.netapp.com/advisory/ntap-20231208-0011"
    },
    {
      "type": "WEB",
      "url": "https://www.debian.org/security/2023/dsa-5530"
    }
  ],
  "schema_version": "1.7.3",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Possible shell escape sequence injection vulnerability in Rack",
  "upstream": [
    "GHSA-wq4h-7r42-5hrr",
    "CVE-2022-30123"
  ]
}



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