Allocation of Resources Without Limits or Throttling Affecting @isaacs/brace-expansion package, versions <5.0.1
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-ISAACSBRACEEXPANSION-15208653
- published5 Feb 2026
- disclosed4 Feb 2026
- creditJvr2022
Introduced: 4 Feb 2026
NewCVE-2026-25547 (opens in a new tab)How to fix?
Upgrade @isaacs/brace-expansion to version 5.0.1 or higher.
Overview
@isaacs/brace-expansion is a Brace expansion as known from sh/bash
Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling due to unbounded brace range expansion. An attacker can cause excessive CPU and memory consumption, potentially crashing the process and the services relying on this library, by supplying patterns with repeated numeric brace ranges that trigger exponential expansion.
PoC
const { expand } = require('@isaacs/brace-expansion');
const pattern = '{0..99}{0..99}{0..99}{0..99}{0..99}';
console.log('Starting expansion...');
expand(pattern);