nnU-Net: Agentic workflow injection in `.github/workflows/issue-triage.yml` of `MIC-DKFZ/nnUNet`

{
  "id": "eb3458f714aae0b6018029491f0752b061002a9f052b85d7a1b48c817203d05c",
  "url": "https://osv.dev/vulnerability/CVE-2026-44246",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "nnU-Net: Agentic workflow injection in `.github/workflows/issue-triage.yml` of `MIC-DKFZ/nnUNet`",
    "summary": "nnU-Net is a semantic segmentation framework that automatically adapts its pipeline to a dataset. Prior to 2.4.1, the nnU-Net Issue Triage workflow in .github/workflows/issue-triage.yml is vulnerable to Agentic Workflow Injection. The workflow sets allowed_non_write_users: ${{ github.event.issue.user.login }}, which means any logged-in GitHub user who opens an issue can reach this agentic workflow with attacker-controlled content. Untrusted issue title and body content are embedded directly into the prompt of anthropics/claude-code-action, and the workflow then runs a command-capable Claude agent with permission to comment on and relabel the current issue via gh. Because this workflow is triggered automatically on issues.opened, an external attacker can submit a crafted issue that steers the agent beyond its intended issue-triage purpose and influences authenticated issue actions. This vulnerability is fixed in 2.4.1.",
    "evidence": "osv:CVE-2026-44246",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-44246",
      "aliases": [
        "CVE-2026-44246",
        "GHSA-63mx-j37w-gh59"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/mic-dkfz/nnunet",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "9945333804fc3424afb4b039bec2d7b7fd221d86"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "2.4.1"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "cpe": "cpe:2.3:a:dkfz:nnu-net:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "2.4.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v2.4",
            "v2.3.1",
            "v2.2",
            "v2.1",
            "v2.0",
            "v1.6.6",
            "v1.6.3",
            "v1.6.2",
            "v1.6.1",
            "v1.5.1",
            "v1.5",
            "v1.1.3",
            "v1.1.2"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-44246.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:27.449012348Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44246.json",
        "https://github.com/MIC-DKFZ/nnUNet/security/advisories/GHSA-63mx-j37w-gh59",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-44246"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-1427"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44246.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-44246",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 493855,
  "published_at": "2026-05-12T20:41:32.162+00:00"
}