ubuntu-cve-2021-32837
Vulnerability from osv_ubuntu
Published
2023-01-17 22:15
Modified
2025-10-24 04:50
Summary
Details

mechanize, a library for automatically interacting with HTTP web servers, contains a regular expression that is vulnerable to regular expression denial of service (ReDoS) prior to version 0.4.6. If a web server responds in a malicious way, then mechanize could crash. Version 0.4.6 has a patch for the issue.

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

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python-clientform",
            "binary_version": "1:0.2.5-3"
          },
          {
            "binary_name": "python-mechanize",
            "binary_version": "1:0.2.5-3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "python-mechanize",
        "purl": "pkg:deb/ubuntu/python-mechanize@1:0.2.5-3?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:0.2.5-3"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python-clientform",
            "binary_version": "1:0.2.5-3"
          },
          {
            "binary_name": "python-mechanize",
            "binary_version": "1:0.2.5-3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "python-mechanize",
        "purl": "pkg:deb/ubuntu/python-mechanize@1:0.2.5-3?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:0.2.5-3"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python3-mechanize",
            "binary_version": "1:0.4.5-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "python-mechanize",
        "purl": "pkg:deb/ubuntu/python-mechanize@1:0.4.5-2?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:0.2.5-3",
        "1:0.4.3-2",
        "1:0.4.5-1",
        "1:0.4.5-2"
      ]
    }
  ],
  "aliases": [],
  "details": "mechanize, a library for automatically interacting with HTTP web servers, contains a regular expression that is vulnerable to regular expression denial of service (ReDoS) prior to version 0.4.6. If a web server responds in a malicious way, then mechanize could crash. Version 0.4.6 has a patch for the issue.",
  "id": "UBUNTU-CVE-2021-32837",
  "modified": "2025-10-24T04:50:21Z",
  "published": "2023-01-17T22:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-32837"
    },
    {
      "type": "REPORT",
      "url": "https://securitylab.github.com/advisories/GHSL-2021-108-python-mechanize-mechanize/"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/python-mechanize/mechanize/blob/3acb1836f3fd8edc5a758a417dd46b53832ae3b5/mechanize/_urllib2_fork.py#L878-L879"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/python-mechanize/mechanize/releases/tag/v0.4.6"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2021-32837"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2021-32837"
  ]
}



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