Potential denial-of-service vulnerability in ASGI requests via file upload limit bypass

{
  "id": "cc371dd5f1082e5832d847b38c14d9314cb0cd3a44cb16c747ff49cb6429fdf6",
  "url": "https://osv.dev/vulnerability/CVE-2026-5766",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Potential denial-of-service vulnerability in ASGI requests via file upload limit bypass",
    "summary": "An issue was discovered in 6.0 before 6.0.5 and 5.2 before 5.2.14. ASGI requests with a missing or understated `Content-Length` header can bypass the `FILE_UPLOAD_MAX_MEMORY_SIZE` limit, potentially loading large files into memory and causing service degradation. As a reminder, Django expects a limit to be configured at the web server level rather than solely relying on `FILE_UPLOAD_MAX_MEMORY_SIZE`. Earlier, unsupported Django series (such as 5.0.x, 4.1.x, and 3.2.x) were not evaluated and may also be affected. Django would like to thank Kyle Agronick for reporting this issue.",
    "evidence": "osv:CVE-2026-5766",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-5766",
      "aliases": [
        "BIT-django-2026-5766",
        "CVE-2026-5766",
        "GHSA-w26r-rmm8-9c29",
        "PYSEC-2026-54"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/django/django",
              "type": "GIT",
              "events": [
                {
                  "introduced": "9e7cc2b628fe8fd3895986af9b7fc9525034c1b0"
                },
                {
                  "fixed": "024c26b1e77ea5b1b158265167ade47927a64c06"
                },
                {
                  "introduced": "36b5f39d9372147f0e758f590e35ee2b2bc317dd"
                },
                {
                  "fixed": "8f8ad09659d728423a00e0a3b5f16da5c3a38e24"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:djangoproject:django:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "5.2"
                      },
                      {
                        "fixed": "5.2.14"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:djangoproject:django:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "6.0"
                      },
                      {
                        "fixed": "6.0.5"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "5.2.13",
            "6.0.4",
            "5.2.12",
            "6.0.3",
            "5.2.11",
            "6.0.2",
            "6.0.1",
            "5.2.10",
            "6.0",
            "5.2.9",
            "5.2.8",
            "5.2.7",
            "5.2.6",
            "5.2.5",
            "5.2.4",
            "5.2.3",
            "5.2.2",
            "5.2.1",
            "5.2"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-5766.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:33.804661207Z",
      "provider": "osv",
      "references": [
        "https://github.com/django/django/",
        "https://docs.djangoproject.com/en/dev/releases/security/",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/5xxx/CVE-2026-5766.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-5766",
        "https://www.djangoproject.com/weblog/2026/may/05/security-releases/",
        "https://pypi.org/project/Django/",
        "https://groups.google.com/g/django-announce"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-130"
        ],
        "cna_assigner": "DSF",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/5xxx/CVE-2026-5766.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-5766",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 501122,
  "published_at": "2026-05-05T14:49:19.715+00:00"
}