CVE-2026-44246
HighSummary
nnU-Net is a semantic segmentation framework that prior to version 2.4.1 was vulnerable to Agentic Workflow Injection in the issue triage workflow. This allowed attackers to manipulate issue content, potentially leading to unauthorized actions on issues.
Risk Assessment
Organizations may be exposed to unauthorized actions in the issue management system, which could lead to loss of control over the triage process and potential data breaches.
Recommendation
It is recommended to upgrade to version 2.4.1 or later to mitigate this vulnerability and review existing workflows to ensure their security.
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Original NVD description (English source)
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.