CVE-2026-25547
CWE-1333Published: February 4, 2026· Updated: Jun 17, 2026
Official 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.
Risk Analysis
The @isaacs/brace-expansion library is vulnerable to a Denial of Service (DoS) attack due to unbounded brace range expansion. An attacker can provide specific patterns that cause the process to consume excessive CPU and memory, potentially crashing the Node.js application.
There is no known public exploit for this issue, and it is not tracked in the KEV catalog. The vulnerability is remotely exploitable with low attack complexity.
Update the library to version 5.0.1 or later to implement proper expansion limits.
Technical Analysis
CVE-2026-25547 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.
CVSS v3.1 Vector Breakdown
Affected Vendors & Products
Exploit & PoC Resources
All References (1)
Quick Facts
Related CVEs (CWE-1333)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2026-25547 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts