Path Traversal in Local File Store Backend

{
  "id": "5a476aba3ddb2d8f5d2f9c8b4d8d479586388e521f683b23d6fef7120501ba68",
  "url": "https://osv.dev/vulnerability/CVE-2026-23939",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Path Traversal in Local File Store Backend",
    "summary": "Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') vulnerability in hexpm hexpm/hexpm ('Elixir.Hexpm.Store.Local' module) allows Relative Path Traversal. This vulnerability is associated with program files lib/hexpm/store/local.ex and program routines 'Elixir.Hexpm.Store.Local':get/3, 'Elixir.Hexpm.Store.Local':put/4, 'Elixir.Hexpm.Store.Local':delete/2, 'Elixir.Hexpm.Store.Local':delete_many/2. This issue does NOT affect hex.pm the service. Only self-hosted deployments using the Local Storage backend are affected. This issue affects hexpm: from 931ee0ed46fa89218e0400a4f6e6d15f96406050 before 5d2ccd2f14f45a63225a73fb5b1c937baf36fdc0.",
    "evidence": "osv:CVE-2026-23939",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-23939",
      "aliases": [
        "CVE-2026-23939",
        "EEF-CVE-2026-23939",
        "GHSA-42mv-r64p-4869"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/hexpm/hexpm",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "5d2ccd2f14f45a63225a73fb5b1c937baf36fdc0"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "fixed": "5d2ccd2f14f45a63225a73fb5b1c937baf36fdc0"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            },
            {
              "repo": "https://github.com/hexpm/hexpm.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "931ee0ed46fa89218e0400a4f6e6d15f96406050"
                },
                {
                  "fixed": "5d2ccd2f14f45a63225a73fb5b1c937baf36fdc0"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "931ee0ed46fa89218e0400a4f6e6d15f96406050"
                      },
                      {
                        "fixed": "5d2ccd2f14f45a63225a73fb5b1c937baf36fdc0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  }
                ]
              }
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-23939.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:29.755518939Z",
      "provider": "osv",
      "references": [
        "https://cna.erlef.org/cves/CVE-2026-23939.html",
        "https://github.com",
        "https://osv.dev/vulnerability/EEF-CVE-2026-23939",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23939.json",
        "https://github.com/hexpm/hexpm/security/advisories/GHSA-42mv-r64p-4869",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-23939",
        "https://github.com/hexpm/hexpm/commit/5d2ccd2f14f45a63225a73fb5b1c937baf36fdc0",
        "https://github.com/hexpm/hexpm.git"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-22"
        ],
        "cna_assigner": "EEF",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23939.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-23939",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 496663,
  "published_at": "2026-02-26T19:41:18.762+00:00"
}