CVE-2026-25547

Uncontrolled Resource Consumption in @isaacs/brace-expansion

Published Feb 4, 2026 CVSS 4.0 · 9.2 Critical EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-7h2j-956f-4vf2 @isaacs/brace-expansion has Uncontrolled Resource Consumption
History
Type Values Removed Values Added
Weaknesses CWE-409
References
Metrics threat_severity

None

cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H'}

threat_severity

Moderate

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Isaacs
Isaacs brace-expansion
Vendors & Products Isaacs
Isaacs brace-expansion
Type Values Removed Values Added
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.
Title Uncontrolled Resource Consumption in @isaacs/brace-expansion
Weaknesses CWE-1333
References
Metrics cvssV4_0

{'score': 9.2, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Feb 5, 2026, 2:31 PM
Reserved
Feb 2, 2026, 7:59 PM
Status
Deferred
Published
Feb 4, 2026, 10:16 PM
Modified
Jun 17, 2026, 10:24 AM
Severity
Moderate
Public date
Feb 4, 2026, 9:51 PM