Vulnerability Details CVE-2026-44246
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 18.4%
CVSS Severity
CVSS v3 Score 7.2
References
Products affected by CVE-2026-44246
-
cpe:2.3:a:dkfz:nnu-net:1.1.2
-
cpe:2.3:a:dkfz:nnu-net:1.1.3
-
cpe:2.3:a:dkfz:nnu-net:1.5
-
cpe:2.3:a:dkfz:nnu-net:1.5.1
-
cpe:2.3:a:dkfz:nnu-net:1.6.1
-
cpe:2.3:a:dkfz:nnu-net:1.6.2
-
cpe:2.3:a:dkfz:nnu-net:1.6.3
-
cpe:2.3:a:dkfz:nnu-net:1.6.4
-
cpe:2.3:a:dkfz:nnu-net:1.6.5
-
cpe:2.3:a:dkfz:nnu-net:1.6.6
-
cpe:2.3:a:dkfz:nnu-net:1.7.0
-
cpe:2.3:a:dkfz:nnu-net:1.7.1
-
cpe:2.3:a:dkfz:nnu-net:2.0
-
cpe:2.3:a:dkfz:nnu-net:2.1
-
cpe:2.3:a:dkfz:nnu-net:2.2
-
cpe:2.3:a:dkfz:nnu-net:2.2.1
-
cpe:2.3:a:dkfz:nnu-net:2.3.1
-
cpe:2.3:a:dkfz:nnu-net:2.4