Backstage: Inconsistent enforcement of allowed location types during catalog processing

{
  "id": "c0f2616c89fa23c42c21892124af3e0ec0fe92500cef1c8c2a272a1ef4c7d750",
  "url": "https://osv.dev/vulnerability/GHSA-pcmq-25r3-5w9v",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Backstage: Inconsistent enforcement of allowed location types during catalog processing",
    "summary": "### Impact Under certain configurations, the catalog backend could process location types that were not intended to be allowed, potentially leading to unintended file access on the backend host. ### Patches Patched in `@backstage/plugin-catalog-backend` version `3.9.1` ### Workarounds No practical workarounds are available. Upgrade to the patched version.",
    "evidence": "osv:GHSA-pcmq-25r3-5w9v",
    "products": [
      {
        "name": {
          "value": "@backstage/plugin-catalog-backend",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "3.9.1",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "low",
    "structured": {
      "id": "GHSA-pcmq-25r3-5w9v",
      "aliases": [
        "CVE-2026-106496",
        "GHSA-pcmq-25r3-5w9v"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "3.9.1"
                }
              ]
            }
          ],
          "package": {
            "name": "@backstage/plugin-catalog-backend",
            "purl": "pkg:npm/%40backstage/plugin-catalog-backend",
            "ecosystem": "npm"
          },
          "database_specific": {
            "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-pcmq-25r3-5w9v/GHSA-pcmq-25r3-5w9v.json"
          }
        }
      ],
      "modified": "2026-10-07T18:15:13.120771098Z",
      "provider": "osv",
      "references": [
        "https://github.com/backstage/backstage/security/advisories/GHSA-pcmq-25r3-5w9v",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-106496",
        "https://github.com/backstage/backstage/commit/23774b61560d851bc69cd6a77d12561b24d11afd",
        "https://github.com/backstage/backstage",
        "https://github.com/backstage/backstage/releases/tag/v1.54.6"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-22",
          "CWE-863"
        ],
        "severity": "LOW",
        "github_reviewed": true,
        "nvd_published_at": "2026-10-06T22:17:04Z",
        "github_reviewed_at": "2026-10-07T17:59:32Z"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-106496",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/database_specific/severity"
  },
  "source_id": "core-osv",
  "document_id": 97168,
  "published_at": "2026-10-07T17:59:32+00:00"
}