GHSA-3WQ7-RQQ7-WX6J

Vulnerability from github – Published: 2026-04-01 21:47 – Updated: 2026-04-01 21:47
VLAI?
Summary
AIOHTTP has late size enforcement for non-file multipart fields causes memory DoS
Details

Summary

For some multipart form fields, aiohttp read the entire field into memory before checking client_max_size.

Impact

If an application uses Request.post() an attacker can send a specially crafted multipart request to force significant temporary memory allocation even when the request is ultimately rejected.

Patch: https://github.com/aio-libs/aiohttp/commit/cbb774f38330563422ca0c413a71021d7b944145

Severity ?
2.7 (Low)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U
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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 3.13.3"
      },
      "package": {
        "ecosystem": "PyPI",
        "name": "aiohttp"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.13.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-34517"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-770"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-01T21:47:07Z",
    "nvd_published_at": "2026-04-01T21:16:59Z",
    "severity": "LOW"
  },
  "details": "### Summary\n\nFor some multipart form fields, aiohttp read the entire field into memory before checking client_max_size.\n\n### Impact\n\nIf an application uses `Request.post()` an attacker can send a specially crafted multipart request to force significant temporary memory allocation even when the request is ultimately rejected.\n\n-----\n\nPatch: https://github.com/aio-libs/aiohttp/commit/cbb774f38330563422ca0c413a71021d7b944145",
  "id": "GHSA-3wq7-rqq7-wx6j",
  "modified": "2026-04-01T21:47:07Z",
  "published": "2026-04-01T21:47:07Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/aio-libs/aiohttp/security/advisories/GHSA-3wq7-rqq7-wx6j"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-34517"
    },
    {
      "type": "WEB",
      "url": "https://github.com/aio-libs/aiohttp/commit/cbb774f38330563422ca0c413a71021d7b944145"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/aio-libs/aiohttp"
    },
    {
      "type": "WEB",
      "url": "https://github.com/aio-libs/aiohttp/releases/tag/v3.13.4"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U",
      "type": "CVSS_V4"
    }
  ],
  "summary": "AIOHTTP has late size enforcement for non-file multipart fields causes memory DoS"
}


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