Flask-Reuploaded vulnerable to Remote Code Execution via Server-Side Template Injection

{
  "id": "db5483e2730d00159953004d4f90f5a7f43012ae887d16b37eb248784c5be73f",
  "url": "https://osv.dev/vulnerability/CVE-2026-27641",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Flask-Reuploaded vulnerable to Remote Code Execution via Server-Side Template Injection",
    "summary": "Flask-Reuploaded provides file uploads for Flask. A critical path traversal and extension bypass vulnerability in versions prior to 1.5.0 allows remote attackers to achieve arbitrary file write and remote code execution through Server-Side Template Injection (SSTI). Flask-Reuploaded has been patched in version 1.5.0. Some workarounds are available. Do not pass user input to the `name` parameter, use auto-generated filenames only, and implement strict input validation if `name` must be used.",
    "evidence": "osv:CVE-2026-27641",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2026-27641",
      "aliases": [
        "CVE-2026-27641",
        "GHSA-65mp-fq8v-56jr",
        "PYSEC-2026-341"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/jugmac00/flask-reuploaded",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "d64c6b2f71cb73734fc38baa0e3e156926361288"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "fixed": "d64c6b2f71cb73734fc38baa0e3e156926361288"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "0.2.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-27641.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:27.658818873Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27641.json",
        "https://github.com/jugmac00/flask-reuploaded/security/advisories/GHSA-65mp-fq8v-56jr",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-27641",
        "https://github.com/jugmac00/flask-reuploaded/commit/d64c6b2f71cb73734fc38baa0e3e156926361288",
        "https://github.com/jugmac00/flask-reuploaded/pull/180"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-1336"
        ],
        "cna_assigner": "GitHub_M",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "fixed": "1.5.0"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StringRangeExpression"
              }
            ]
          },
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "fixed": "1.5.0"
                  },
                  {
                    "fixed": "1.5.0"
                  }
                ],
                "source": "DESCRIPTION"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27641.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-27641",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 494296,
  "published_at": "2026-02-25T03:54:54.391+00:00"
}