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CVE-2026-14257— brace-expansion DoS via unbounded expansion length causing an out-of-memory process crash

Quick assessment

Affected
juliangruber brace-expansion
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Julian Gruber brace-expansion是Julian Gruber个人开发者开源的一个JavaScript中的Brace扩展。 Julian Gruber brace-expansion 5.0.7及之前版本存在资源管理错误漏洞，该漏洞源于expand()函数未限制结果字符串长度，可能导致通过内存耗尽触发拒绝服务。

CVSS 7.5 · High EPSS 0.64% · P50

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
juliangruber brace-expansion ≤ 5.0.7 affected
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I. Basic Information for CVE-2026-14257

Vulnerability Information
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Vulnerability Title
brace-expansion DoS via unbounded expansion length causing an out-of-memory process crash
Source: CVE Program / CVE List V5
Vulnerability Description
brace-expansion through 5.0.7 is vulnerable to denial of service via memory exhaustion. The expand() function limits the number of results with a max option (default 100,000) but does not bound the length of each result string. By chaining multiple brace groups, an attacker keeps the result count under the limit while making each result progressively longer, so total memory scales with both count and string length until the process hits a fatal, uncatchable out-of-memory error. About 7.5 KB of input ('{a,b}'.repeat(1500)) crashes a default Node.js process. Any application that passes attacker-influenced strings to brace-expansion.expand() - directly or transitively via minimatch / glob brace patterns - can be crashed by a small request. Fixed in 5.0.8 by adding a maxLength option (default 4,000,000) that bounds accumulated output and intermediate arrays.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
Julian Gruber brace-expansion 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Julian Gruber brace-expansion是Julian Gruber个人开发者开源的一个JavaScript中的Brace扩展。 Julian Gruber brace-expansion 5.0.7及之前版本存在资源管理错误漏洞，该漏洞源于expand()函数未限制结果字符串长度，可能导致通过内存耗尽触发拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
juliangruber brace-expansion 0 ~ 5.0.7 -

II. Public POCs for CVE-2026-14257

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Reproduced successfully in a real sandbox · Below is the actual recording of building the environment and exploiting the vulnerability.
Success marker: VULNERABLE: process completed normally (exit code 0, 815 ms). The maxLength cap in v5.0.8 bounds accumulated output, preventing the OOM crash described in the CVE.
Reproduction recording is a Pro+ exclusive
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Qwen3.6-35B-A3B · 7033 chars
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III. Intelligence Information for CVE-2026-14257

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Patches & Fixes for CVE-2026-14257 (1)

Vendor Pages for CVE-2026-14257 (1)

IV. Related Vulnerabilities

Same product: brace-expansion
Same vendor: juliangruber
Same weakness: CWE-400

V. Comments for CVE-2026-14257

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