CVE-2026-44246

[CVE catalog]

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.

Severity

High · CVSS 7.2CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

Published

May 12, 2026, 9:16:16 PM UTC

Source

[NVD] · [CVE record]

EPSS

0.29% · Oct 27, 2026

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  "fixed_versions": [],
  "distribution_packages": [
    {
      "name": "nnu-net",
      "ecosystem": "cpe",
      "fixed_version": "2.4.1"
    },
    {
      "name": "nnu-net",
      "ranges": [
        {
          "fixed": "2.4.1",
          "introduced": "",
          "last_affected": "",
          "start_excluding": ""
        }
      ],
      "ecosystem": "cpe",
      "fixed_version": "2.4.1",
      "provider_record_id": "NVD-CVE-2026-44246"
    }
  ]
}