Billy: Path traversal vulnerabilities

{
  "id": "d9c945f8880baf135efc3c1c177424f0c4892d5e01ae933454dd5f99bd4d3c36",
  "url": "https://osv.dev/vulnerability/CVE-2026-44973",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Billy: Path traversal vulnerabilities",
    "summary": "Billy is an interface filesystem abstraction for Go. Prior to 5.9.0, multiple path traversal issues exist across different components of go-billy. Insufficient path sanitization and boundary enforcement may allow crafted paths (e.g., using ..) to escape intended base directories. While go-billy was not originally designed to provide a strong security boundary, some of these issues were inconsistent across some of the built-in implementations. This results in scenarios where applications relying on go-billy for some level of isolation may inadvertently expose access to unintended filesystem locations. This vulnerability is fixed in 5.9.0.",
    "evidence": "osv:CVE-2026-44973",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-44973",
      "aliases": [
        "CVE-2026-44973",
        "GHSA-qw64-3x98-g7q2",
        "GO-2026-5597"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/go-git/go-billy",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "237e529bb8de61704047f71a5ab1c8e6676492f1"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "5.9.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "5.9.0"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v5.8.0",
            "v5.7.0",
            "v5.6.2",
            "v5.6.1",
            "v5.6.0",
            "v5.5.0",
            "v5.4.1",
            "v5.4.0",
            "v5.3.1",
            "v5.3.0",
            "v5.2.0",
            "v5.1.0",
            "v5.0.0",
            "v4.3.2",
            "v4.3.1",
            "v4.3.0",
            "v4.2.1",
            "v4.2.0",
            "v4.1.1",
            "v4.1.0",
            "v4.0.2",
            "v4.0.1",
            "v4.0.0",
            "v3.1.0",
            "v3.0.1",
            "v3.0.0",
            "v2.0.5",
            "v2.0.3",
            "v2.0.4",
            "v2.0.2",
            "v2.0.0",
            "v1.0.0",
            "v1-alpha"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-44973.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:45.546223715Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44973.json",
        "https://github.com/go-git/go-billy/security/advisories/GHSA-qw64-3x98-g7q2",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-44973"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-22"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44973.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-44973",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 513752,
  "published_at": "2026-05-28T21:26:14.734+00:00"
}