pysec-2021-108
Vulnerability from pysec
Published
2021-06-29 11:15
Modified
2021-07-02 18:56
Details

An issue was discovered in urllib3 before 1.26.5. When provided with a URL containing many @ characters in the authority component, the authority regular expression exhibits catastrophic backtracking, causing a denial of service if a URL were passed as a parameter or redirected to via an HTTP redirect.




{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "urllib3",
        "purl": "pkg:pypi/urllib3"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2d4a3fee6de2fa45eb82169361918f759269b4ec"
            }
          ],
          "repo": "https://github.com/urllib3/urllib3",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.26.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.2",
        "0.3",
        "0.3.1",
        "0.4.0",
        "0.4.1",
        "1.0",
        "1.0.1",
        "1.0.2",
        "1.1",
        "1.10",
        "1.10.1",
        "1.10.2",
        "1.10.3",
        "1.10.4",
        "1.11",
        "1.12",
        "1.13",
        "1.13.1",
        "1.14",
        "1.15",
        "1.15.1",
        "1.16",
        "1.17",
        "1.18",
        "1.18.1",
        "1.19",
        "1.19.1",
        "1.2",
        "1.2.1",
        "1.2.2",
        "1.20",
        "1.21",
        "1.21.1",
        "1.22",
        "1.23",
        "1.24",
        "1.24.1",
        "1.24.2",
        "1.24.3",
        "1.25",
        "1.25.1",
        "1.25.10",
        "1.25.11",
        "1.25.2",
        "1.25.3",
        "1.25.4",
        "1.25.5",
        "1.25.6",
        "1.25.7",
        "1.25.8",
        "1.25.9",
        "1.26.0",
        "1.26.1",
        "1.26.2",
        "1.26.3",
        "1.26.4",
        "1.3",
        "1.4",
        "1.5",
        "1.6",
        "1.7",
        "1.7.1",
        "1.8",
        "1.8.2",
        "1.8.3",
        "1.9",
        "1.9.1"
      ]
    }
  ],
  "aliases": [
    "CVE-2021-33503",
    "GHSA-q2q7-5pp4-w6pg"
  ],
  "details": "An issue was discovered in urllib3 before 1.26.5. When provided with a URL containing many @ characters in the authority component, the authority regular expression exhibits catastrophic backtracking, causing a denial of service if a URL were passed as a parameter or redirected to via an HTTP redirect.",
  "id": "PYSEC-2021-108",
  "modified": "2021-07-02T18:56:20.858344Z",
  "published": "2021-06-29T11:15:00Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-q2q7-5pp4-w6pg"
    },
    {
      "type": "FIX",
      "url": "https://github.com/urllib3/urllib3/commit/2d4a3fee6de2fa45eb82169361918f759269b4ec"
    }
  ]
}


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  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
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  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.