Git Argument Injection in prefecthq/prefect

{
  "id": "034ee1dc1d2292151e1f77217e6a870b22480160f0e7fccb51a69106ac0fdc60",
  "url": "https://osv.dev/vulnerability/CVE-2026-5366",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Git Argument Injection in prefecthq/prefect",
    "summary": "Prefect version 3.6.23 is vulnerable to remote code execution due to improper handling of user-controlled input in the `GitRepository` storage class. The `commit_sha` parameter, which is passed to git commands, lacks validation and does not include a `--` separator to distinguish user input from git flags. This allows attackers to inject arbitrary git flags, such as `--upload-pack`, enabling execution of external programs. Additionally, the `directories` parameter can be exploited to inject git flags during sparse-checkout operations. These vulnerabilities allow any user with deployment creation permissions to execute arbitrary commands on worker machines, compromising shared work pools in multi-tenant environments.",
    "evidence": "osv:CVE-2026-5366",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2026-5366",
      "aliases": [
        "CVE-2026-5366"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/prefecthq/prefect",
              "type": "GIT",
              "events": [
                {
                  "introduced": "db5763e0905ba1547e4c4d1105d5ba9ea46993d6"
                },
                {
                  "last_affected": "db5763e0905ba1547e4c4d1105d5ba9ea46993d6"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:prefect:prefect:3.6.23:-:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "3.6.23-NA"
                      },
                      {
                        "last_affected": "3.6.23-NA"
                      }
                    ],
                    "source": "CPE_STRING"
                  }
                ]
              }
            }
          ],
          "versions": [
            "3.6.23-NA",
            "3.6.23"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-5366.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:32.936615427Z",
      "provider": "osv",
      "references": [
        "https://huntr.com/bounties/e2e88a0f-a8f6-49c9-94c5-e98dc385f07a",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/5xxx/CVE-2026-5366.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-5366"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-94"
        ],
        "cna_assigner": "@huntr_ai",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/5xxx/CVE-2026-5366.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-5366",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 500166,
  "published_at": "2026-06-20T16:43:37.345+00:00"
}