Uncontrolled Recursion Affecting brace-expansion package, versions <1.1.20>=2.0.0 <2.1.6>=3.0.0 <3.0.8>=4.0.0 <5.0.11
Threat Intelligence
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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Test your applications- Snyk IDSNYK-JS-BRACEEXPANSION-20244948
- published29 Sept 2026
- disclosed28 Sept 2026
- creditGareth Jones, Jeremy Katz
Introduced: 28 Sep 2026
NewCVE-2026-102278 (opens in a new tab)How to fix?
Upgrade brace-expansion to version 1.1.20, 2.1.6, 3.0.8, 5.0.11 or higher.
Overview
brace-expansion is a Brace expansion as known from sh/bash
Affected versions of this package are vulnerable to Uncontrolled Recursion via uncontrolled recursion in expand_ when processing deeply nested brace patterns. An attacker can supply approximately 6 KB of deeply nested braces (e.g., { repeated ~3,200 times followed by a,b and the matching } characters) to exhaust the native call stack and crash the process with a RangeError: Maximum call stack size exceeded. The max and maxLength bounds do not prevent this because the stack is exhausted during recursive descent into sub-expansions, before the result set grows.