PsiTransfer: Upload PATCH path traversal can create `config..js` and lead to code execution on restart

{
  "id": "c89c0a1f1c0215218ba1154675bc78e39e686a9e770faa64b04d63dffdf189c7",
  "url": "https://osv.dev/vulnerability/CVE-2026-41180",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "PsiTransfer: Upload PATCH path traversal can create `config..js` and lead to code execution on restart",
    "summary": "PsiTransfer is an open source, self-hosted file sharing solution. Prior to version 2.4.3, the upload PATCH flow under `/files/:uploadId` validates the mounted request path using the still-encoded `req.path`, but the downstream tus handler later writes using the decoded `req.params.uploadId`. In deployments that use a supported custom `PSITRANSFER_UPLOAD_DIR` whose basename prefixes a startup-loaded JavaScript path, such as `conf`, an unauthenticated attacker can create `config..js` in the application root. The attacker-controlled file is then executed on the next process restart. Version 2.4.3 contains a patch.",
    "evidence": "osv:CVE-2026-41180",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-41180",
      "aliases": [
        "CVE-2026-41180",
        "GHSA-533q-w4g6-5586"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/psi-4ward/psitransfer",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "8b547bf3e09757122efa00aab90281e3915aa0c6"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "2.4.3"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "8b547bf3e09757122efa00aab90281e3915aa0c6"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "8b547bf3e09757122efa00aab90281e3915aa0c6"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v2.4.3"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "2.4.3"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v2.4.2",
            "v2.4.1",
            "v2.4.0",
            "v2.3.2",
            "v2.3.1",
            "2.3",
            "v2.3.0",
            "v2.2.0",
            "v2.1.2",
            "v2.1.1",
            "v2.1.0",
            "v2.0.1",
            "v2.0.0",
            "2.0",
            "1.3.4",
            "1.3.3",
            "1.3",
            "1.3.2",
            "1.3.1",
            "1.3.0",
            "1.2.0",
            "1.2",
            "1",
            "1.1.1",
            "1.1",
            "1.1.0",
            "1.1.0-beta",
            "1.0.0",
            "1.0",
            "1.0.0-rc.1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-41180.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:30.644446101Z",
      "provider": "osv",
      "references": [
        "https://github.com/psi-4ward/psitransfer/releases/tag/v2.4.3",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41180.json",
        "https://github.com/psi-4ward/psitransfer/security/advisories/GHSA-533q-w4g6-5586",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-41180",
        "https://github.com/psi-4ward/psitransfer/commit/8b547bf3e09757122efa00aab90281e3915aa0c6"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-22"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41180.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-41180",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 497786,
  "published_at": "2026-04-23T00:10:58.23+00:00"
}