CVE-2026-44246: nnU-Net is a semantic segmentation framework that automatically adapts its pipeline to a dataset. Pr…
- Occurred
- May 12, 2026
- Published
- May 12, 2026
- Source
- NVD CVE
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.
Tags
- CVE
- CVE-2026-44246
- cvss:HIGH
Classification
Rationale: Vulnerability allows attackers to inject malicious prompts into an LLM-powered agent workflow, enabling unauthorized issue manipulation.
Classifier: Qwen/Qwen3.5-35B-A3B-FP8