{"id":"CVE-2026-44246","summary":"nnU-Net: Agentic workflow injection in `.github/workflows/issue-triage.yml` of `MIC-DKFZ/nnUNet`","details":"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.","aliases":["GHSA-63mx-j37w-gh59"],"modified":"2026-07-08T08:13:47.219663493Z","published":"2026-05-12T20:41:32.162Z","database_specific":{"cwe_ids":["CWE-1427"],"cna_assigner":"GitHub_M","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44246.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44246.json"},{"type":"ADVISORY","url":"https://github.com/MIC-DKFZ/nnUNet/security/advisories/GHSA-63mx-j37w-gh59"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-44246"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/mic-dkfz/nnunet","events":[{"introduced":"0"},{"fixed":"9945333804fc3424afb4b039bec2d7b7fd221d86"}],"database_specific":{"cpe":"cpe:2.3:a:dkfz:nnu-net:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"0"},{"fixed":"2.4.1"}],"source":["AFFECTED_FIELD","CPE_RANGE"]}}],"versions":["v2.4","v2.3.1","v2.2","v2.1","v2.0","v1.6.6","v1.6.3","v1.6.2","v1.6.1","v1.5.1","v1.5","v1.1.3","v1.1.2"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-44246.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N"}]}