Steeltoe: TLS private keys written to /tmp with default permissions, never deleted

{
  "id": "b245d4b03726e38f63c7d241c7e1e84893f3d4c16e394f1de0ff3b857000ef5e",
  "url": "https://osv.dev/vulnerability/CVE-2026-50267",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Steeltoe: TLS private keys written to /tmp with default permissions, never deleted",
    "summary": "Steeltoe is an open source project that provides a collection of libraries that helps users build cloud-native applications. In Steeltoe.Configuration.Abstractions 4.0.0 through 4.1.0, when MySQL or PostgreSQL service bindings from `VCAP_SERVICES` include TLS client credentials, the Connectors library writes those credentials to temporary files in `Path.GetTempPath()` using `File.CreateText`. On Linux, `File.CreateText` creates files with mode `0644` (world-readable) under the process umask, and the files are never deleted. The same key material is protected at mode `0400` in `/proc//environ`. Steeltoe.Configuration.Abstractions version 4.2.0 patches the issue. If an immediate upgrade is not possible, prevent other processes from running in the container under a different UID with access to `/tmp`.",
    "evidence": "osv:CVE-2026-50267",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-50267",
      "aliases": [
        "CVE-2026-50267",
        "GHSA-rxrh-4j9h-xgg9"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/steeltoeoss/steeltoe",
              "type": "GIT",
              "events": [
                {
                  "introduced": "c4d303abd0d8a53b62516c0281643e00c1a69f0e"
                },
                {
                  "fixed": "2d4338d0fc3990a8df90968187d9567004d3fbe7"
                },
                {
                  "fixed": "8dd97cc6c4b184121a4bd1f92f9ac16918433471"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "4.0.0"
                      },
                      {
                        "fixed": "4.2.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "8dd97cc6c4b184121a4bd1f92f9ac16918433471"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-50267.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:41.116335855Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/50xxx/CVE-2026-50267.json",
        "https://github.com/SteeltoeOSS/security-advisories/security/advisories/GHSA-rxrh-4j9h-xgg9",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-50267",
        "https://github.com/SteeltoeOSS/Steeltoe/commit/8dd97cc6c4b184121a4bd1f92f9ac16918433471"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-312",
          "CWE-732"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/50xxx/CVE-2026-50267.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-50267",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 509037,
  "published_at": "2026-06-17T21:57:09.043+00:00"
}