denoland deno up to 2.7.9 escapeShellArg os command injection

Summaryinfo

A vulnerability was found in denoland deno up to 2.7.9. It has been classified as critical. This affects the function escapeShellArg. The manipulation leads to os command injection. This vulnerability is uniquely identified as CVE-2026-49402. The attack is possible to be carried out remotely. No exploit exists. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability, which was classified as critical, has been found in denoland deno up to 2.7.9. This issue affects the function escapeShellArg. The manipulation with an unknown input leads to a os command injection vulnerability. Using CWE to declare the problem leads to CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-49402 since 05/29/2026. The exploitation is known to be difficult. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1202 according to MITRE ATT&CK.

Upgrading to version 2.7.10 eliminates this vulnerability.

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Productinfo

Vendor

• denoland

Name

• deno

Version

• 2.7.0
• 2.7.1
• 2.7.2
• 2.7.3
• 2.7.4
• 2.7.5
• 2.7.6
• 2.7.7
• 2.7.8
• 2.7.9

Website

• Product: https://github.com/denoland/deno/

CPE 2.3info

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CPE 2.2info

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