Flyto2 Core: Unauthenticated flyto-verification /run: callback_url SSRF and internal runner-secret exfiltration

{
  "id": "e81745080fc18fede9d9a69c9894d7a1a5f2189cb8599a61665af62851bdaf8e",
  "url": "https://osv.dev/vulnerability/CVE-2026-67426",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Flyto2 Core: Unauthenticated flyto-verification /run: callback_url SSRF and internal runner-secret exfiltration",
    "summary": "Flyto2 Core is an execution kernel for automation and AI-agent workflows. Prior to 2.26.7, the standalone flyto-verification service in src/core/verification_service.py exposes unauthenticated POST /run on 0.0.0.0:8344 and uses client-supplied callback_url for an outbound POST with X-Internal-Key: $FLYTO_RUNNER_SECRET while bypassing target_allowed, allowing unauthenticated SSRF and runner secret exfiltration. This issue is fixed in version 2.26.7.",
    "evidence": "osv:CVE-2026-67426",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2026-67426",
      "aliases": [
        "CVE-2026-67426",
        "GHSA-jx74-cqjv-2c67",
        "PYSEC-2026-3571"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/flytohub/flyto-core",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "9449def37907190798b5d677b716526b09ae7302"
                },
                {
                  "fixed": "0a0a528520ec18f5a21f1ddf858a71cc1edfb6e9"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "2.26.7"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "0a0a528520ec18f5a21f1ddf858a71cc1edfb6e9"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "9449def37907190798b5d677b716526b09ae7302"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v2.26.7"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v2.26.6",
            "v2.26.4",
            "v2.26.3",
            "v2.26.0",
            "v2.25.27",
            "v2.17.6",
            "v2.16.3",
            "v2.5.0",
            "v2.2.2"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-67426.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:28.071952476Z",
      "provider": "osv",
      "references": [
        "https://github.com/flytohub/flyto-core/releases/tag/v2.26.7",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67426.json",
        "https://github.com/flytohub/flyto-core/security/advisories/GHSA-jx74-cqjv-2c67",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-67426",
        "https://github.com/flytohub/flyto-core/commit/0a0a528520ec18f5a21f1ddf858a71cc1edfb6e9"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-306",
          "CWE-522",
          "CWE-918"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67426.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-67426",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 494892,
  "published_at": "2026-07-29T18:43:26.247+00:00"
}