ghsa-2qfp-q593-8484
Vulnerability from github
Published
2025-10-31 00:30
Modified
2025-11-07 19:11
Severity ?
7.5 (High) - CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
Scrapy with Brotli is vulnerable to a denial of service (DoS) attack due to decompression
Details

Brotli versions up to 1.1.0 are vulnerable to a denial of service (DoS) attack due to decompression. This issue has been patched in Brotli version 1.2.0.

Additionally, this affects users who implement the Brotli decompression with Scrapy versions up to 2.13.2, leaving them vulnerable to a denial of service (DoS) attack. The protection mechanism against decompression bombs fails to mitigate the brotli variant, allowing remote servers to crash clients with less than 80GB of available memory. This occurs because brotli can achieve extremely high compression ratios for zero-filled data, leading to excessive memory consumption during decompression.

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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 1.1.0"
      },
      "package": {
        "ecosystem": "PyPI",
        "name": "brotli"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.2.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "Scrapy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "2.13.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2025-6176"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2025-10-31T21:23:47Z",
    "nvd_published_at": "2025-10-31T00:15:37Z",
    "severity": "HIGH"
  },
  "details": "Brotli versions up to 1.1.0 are vulnerable to a denial of service (DoS) attack due to decompression. This issue has been patched in Brotli version 1.2.0. \n\nAdditionally, this affects users who implement the Brotli decompression with Scrapy versions up to 2.13.2, leaving them vulnerable to a denial of service (DoS) attack. The protection mechanism against decompression bombs fails to mitigate the brotli variant, allowing remote servers to crash clients with less than 80GB of available memory. This occurs because brotli can achieve extremely high compression ratios for zero-filled data, leading to excessive memory consumption during decompression.",
  "id": "GHSA-2qfp-q593-8484",
  "modified": "2025-11-07T19:11:50Z",
  "published": "2025-10-31T00:30:35Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-6176"
    },
    {
      "type": "WEB",
      "url": "https://github.com/google/brotli/issues/1327#issuecomment-3457434715"
    },
    {
      "type": "WEB",
      "url": "https://github.com/google/brotli/issues/1327#issuecomment-3479462458"
    },
    {
      "type": "WEB",
      "url": "https://github.com/google/brotli/issues/1375"
    },
    {
      "type": "WEB",
      "url": "https://github.com/github/advisory-database/pull/6380"
    },
    {
      "type": "WEB",
      "url": "https://github.com/google/brotli/pull/1234"
    },
    {
      "type": "WEB",
      "url": "https://github.com/scrapy/scrapy/pull/7134"
    },
    {
      "type": "WEB",
      "url": "https://github.com/google/brotli/commit/67d78bc41db1a0d03f2e763497748f2f69946627"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/google/brotli"
    },
    {
      "type": "WEB",
      "url": "https://github.com/google/brotli/releases/tag/v1.2.0"
    },
    {
      "type": "WEB",
      "url": "https://huntr.com/bounties/2c26a886-5984-47ee-a421-0d5fe1344eb0"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Scrapy with Brotli is vulnerable to a denial of service (DoS) attack due to decompression"
}


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