BREW-AIRSHARE-CVE-2021-21330 (GHSA-V6WP-4M6F-GCJG)

Vulnerability from osv_homebrew – Published: 2026-08-13 16:35 – Updated: 2026-10-13 09:26 – Source website
VLAI
Summary
`aiohttp` Open Redirect vulnerability (`normalize_path_middleware` middleware)
Details

Impact

Open redirect vulnerability — a maliciously crafted link to an aiohttp-based web-server could redirect the browser to a different website.

It is caused by a bug in the aiohttp.web_middlewares.normalize_path_middleware middleware.

Patches

This security problem has been fixed in v3.7.4. Upgrade your dependency as follows: [pip install aiohttp >= 3.7.4]

Workarounds

If upgrading is not an option for you, a workaround can be to avoid using aiohttp.web_middlewares.normalize_path_middleware in your applications.

References

For more information

If you have any questions or comments about this advisory: * Open an issue in the aiohttp repo * Email us at wk+aio-libs-security@sydorenko.org.ua and/or andrew.svetlov+aio-libs-security@gmail.com

Credit: Jelmer Vernooij and Beast Glatisant.

Severity
3.1 (Low)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N
2.3 (Low)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "fix": "bump",
        "range_state": "fixed",
        "resource": "aiohttp",
        "resource_purl": "pkg:pypi/aiohttp@3.14.4",
        "upstream_fixed_in": "3.7.4"
      },
      "package": {
        "ecosystem": "Homebrew",
        "name": "airshare",
        "purl": "pkg:brew/airshare"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.1.5"
            },
            {
              "fixed": "0.1.6_3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "confidence": "high",
    "source": "matched",
    "strategy": "registry",
    "upstream_evidence": [
      {
        "ecosystem": "PyPI",
        "key": "pkg:pypi/aiohttp@3.14.4",
        "name": "aiohttp",
        "resource": "aiohttp",
        "strategy": "registry",
        "subject_version": "3.14.4"
      }
    ]
  },
  "details": "### Impact\n\nOpen redirect vulnerability \u2014 a maliciously crafted link to an aiohttp-based web-server could redirect the browser to a different website.\n\nIt is caused by a bug in the `aiohttp.web_middlewares.normalize_path_middleware` middleware.\n\n### Patches\n\nThis security problem has been fixed in v3.7.4. Upgrade your dependency as follows:\n[`pip install aiohttp \u003e= 3.7.4`]\n\n### Workarounds\n\nIf upgrading is not an option for you, a workaround can be to avoid using `aiohttp.web_middlewares.normalize_path_middleware` in your applications.\n\n### References\n\n* [aiohttp @ PyPI]\n* [GHSA-v6wp-4m6f-gcjg]\n* [OWASP page on open redirects]\n\n### For more information\n\nIf you have any questions or comments about this advisory:\n* Open an issue in the [aiohttp repo](https://github.com/aio-libs/aiohttp/issues/new/choose)\n* Email us at wk+aio-libs-security@sydorenko.org.ua and/or andrew.svetlov+aio-libs-security@gmail.com\n\nCredit: [Jelmer Vernoo\u0133] and [Beast Glatisant].\n\n[aiohttp @ PyPI]: https://pypi.org/p/aiohttp\n[`pip install aiohttp \u003e= 3.7.4`]: https://pypi.org/project/aiohttp/3.7.4/\n[GHSA-v6wp-4m6f-gcjg]: https://github.com/aio-libs/aiohttp/security/advisories/GHSA-v6wp-4m6f-gcjg\n[OWASP page on open redirects]:\nhttps://cheatsheetseries.owasp.org/cheatsheets/Unvalidated_Redirects_and_Forwards_Cheat_Sheet.html\n\n[Jelmer Vernoo\u0133]: https://jelmer.uk\n[Beast Glatisant]: https://github.com/g147",
  "id": "BREW-airshare-CVE-2021-21330",
  "modified": "2026-10-13T09:26:38Z",
  "published": "2026-08-13T16:35:13Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/aio-libs/aiohttp/security/advisories/GHSA-v6wp-4m6f-gcjg"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-21330"
    },
    {
      "type": "WEB",
      "url": "https://github.com/aio-libs/aiohttp/commit/2545222a3853e31ace15d87ae0e2effb7da0c96b"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/aio-libs/aiohttp"
    },
    {
      "type": "WEB",
      "url": "https://github.com/aio-libs/aiohttp/blob/master/CHANGES.rst#374-2021-02-25"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/advisory-database/tree/main/vulns/aiohttp/PYSEC-2021-76.yaml"
    },
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FU7ENI54JNEK3PHEFGCE46DGMFNTVU6L"
    },
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JN3V7CZJRT4QFCVXB6LDPCJH7NAOFCA5"
    },
    {
      "type": "WEB",
      "url": "https://pypi.org/project/aiohttp"
    },
    {
      "type": "WEB",
      "url": "https://security.gentoo.org/glsa/202208-19"
    },
    {
      "type": "WEB",
      "url": "https://www.debian.org/security/2021/dsa-4864"
    }
  ],
  "schema_version": "1.7.3",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "`aiohttp` Open Redirect vulnerability (`normalize_path_middleware` middleware)",
  "upstream": [
    "GHSA-v6wp-4m6f-gcjg",
    "CVE-2021-21330",
    "PYSEC-2021-76"
  ]
}



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