CVE-2026-49402

Deno is a JavaScript, TypeScript, and WebAssembly runtime. Prior to 2.7.10, Deno's node:child_process implementation provided an escapeShellArg() helper used when callers passed shell: true to spawn / spawnSync / exec and friends. On Windows, the helper failed to quote arguments that contained cmd.exe metacharacters and did not neutralize % (which cmd.exe expands even inside double-quoted strings). An attacker who controlled any portion of an argument passed to such a call could inject arbitrary additional commands into the spawned cmd.exe invocation. This vulnerability is fixed in 2.7.10.

• CWE-78

• https://github.com/denoland/deno/security/advisories/GHSA-7xh3-mhg9-jcw8Exploit, Mitigation, Vendor Advisory
• https://github.com/denoland/deno/security/advisories/GHSA-7xh3-mhg9-jcw8Exploit, Mitigation, Vendor Advisory

Published

Jun 23, 2026

Last Modified

Jun 26, 2026

Status

Analyzed

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