GHSA-2QFP-Q593-8484

Vulnerability from github – Published: 2025-10-31 00:30 – Updated: 2025-11-17 15:50
VLAI?
Summary
Scrapy is vulnerable to a denial of service (DoS) attack due to flaws in brotli decompression implementation
Details

Scrapy versions up to 2.13.3 are vulnerable to a denial of service (DoS) attack due to a flaw in its brotli decompression implementation. 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. Mitigation for this vulnerability needs security enhancement added in brotli v1.2.0.

Severity ?
7.5 (High)
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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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"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 2.13.3"
      },
      "package": {
        "ecosystem": "PyPI",
        "name": "Scrapy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.13.4"
            }
          ],
          "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": "Scrapy versions up to 2.13.3 are vulnerable to a denial of service (DoS) attack due to a flaw in its brotli decompression implementation. 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. Mitigation for this vulnerability needs security enhancement added in brotli v1.2.0.",
  "id": "GHSA-2qfp-q593-8484",
  "modified": "2025-11-17T15:50:19Z",
  "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"
    },
    {
      "type": "WEB",
      "url": "https://github.com/google/brotli/issues/1375"
    },
    {
      "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": "WEB",
      "url": "https://github.com/scrapy/scrapy/commit/14737e91edc513967f516fc839cc9c8a4f8d91da"
    },
    {
      "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 is vulnerable to a denial of service (DoS) attack due to flaws in brotli decompression implementation"
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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