CVE-2026-44246— nnU-Net: Agentic workflow injection in `.github/workflows/issue-triage.yml` of `MIC-DKFZ/nnUNet`
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I. Basic Information for CVE-2026-44246
Vulnerability Information
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Vulnerability Title
nnU-Net: Agentic workflow injection in `.github/workflows/issue-triage.yml` of `MIC-DKFZ/nnUNet`
Source: NVD (National Vulnerability Database)
Vulnerability Description
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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
CWE-1427
Source: NVD (National Vulnerability Database)
Vulnerability Title
nnU-Net 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
nnU-Net是MIC-DKFZ开源的一款自动适配数据集的语义分割框架。 nnU-Net 2.4.1之前版本存在安全漏洞，该漏洞源于Issue Triage工作流允许攻击者控制内容注入Claude代理提示，可能导致代理工作流注入。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-44246
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- https://github.com/MIC-DKFZ/nnUNet/security/advisories/GHSA-63mx-j37w-gh59x_refsource_CONFIRM
- https://nvd.nist.gov/vuln/detail/CVE-2026-44246
IV. Related Vulnerabilities
Same weakness: CWE-1427
V. Comments for CVE-2026-44246
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