Arbitrary Command Injection Affecting shell-quote package, versions >=1.1.0 <1.8.4
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learning- Snyk IDSNYK-JS-SHELLQUOTE-16799355
- published22 May 2026
- disclosed22 May 2026
- creditAkshat Sinha
Introduced: 22 May 2026
NewCVE-2026-9277 (opens in a new tab)How to fix?
Upgrade shell-quote to version 1.8.4 or higher.
Overview
shell-quote is a package used to quote and parse shell commands.
Affected versions of this package are vulnerable to Arbitrary Command Injection via the quote() function when object-token inputs containing line terminators (\n, \r, U+2028, U+2029) in the .op field are not properly validated. An attacker can execute arbitrary commands by supplying crafted input that includes line terminators, which are interpreted as command separators by POSIX shells. The vulnerable path is reachable in two ways: by direct construction from external input ({ op: '...\n...' }) or by untrusted input being passed to parse(cmd, envFn) by envFn.