CVE-2026-25547

Description

@isaacs/brace-expansion is a hybrid CJS/ESM TypeScript fork of brace-expansion. Prior to version 5.0.1, @isaacs/brace-expansion is vulnerable to a denial of service (DoS) issue caused by unbounded brace range expansion. When an attacker provides a pattern containing repeated numeric brace ranges, the library attempts to eagerly generate every possible combination synchronously. Because the expansion grows exponentially, even a small input can consume excessive CPU and memory and may crash the Node.js process. This issue has been patched in version 5.0.1.

How to fix CVE-2026-25547

To remediate CVE-2026-25547, upgrade the affected package to a fixed version below.

• —no fix listed
• —upgrade to 5.0.1 or later

Is CVE-2026-25547 being exploited?

Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.

Affected packages (2)

• from 0
• from 0, < 5.0.1

CVSS scores

References (4)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2026-25547
• ADVISORYsecurity-tracker.debian.org/tracker/CVE-2026-25547
• PATCHgithub.com/isaacs/brace-expansion
• WEBgithub.com/isaacs/brace-expansion/security/advisories/GHSA-7h2j-956f-4vf2