CVE-2026-14257: high-severity vulnerability in juliangruber brace-expansion
brace-expansion DoS via unbounded expansion length causing an out-of-memory process crash
Published
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21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.5epss 0.6%
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
juliangruber · brace-expansionRelated CVEs — juliangruber brace-expansion
In the same product, most dangerous first.
CVE-2026-69152HIGHbrace-expansion: DoS via unbounded intermediate arrays, bypassing the CVE-2026-14257 mitigationEPSS 0.6%CVE-2025-5889LOWjuliangruber brace-expansion index.js expand redosEPSS 0.6%CVE-2026-102278HIGHbrace-expansion: DoS via uncontrolled recursion on nested brace groups causing stack exhaustionEPSS 0.5%CVE-2026-102276HIGHbrace-expansion: DoS via uncontrolled recursion in parseCommaParts causing stack exhaustionEPSS 0.5%CVE-2026-33750MEDIUMbrace-expansion: Zero-step sequence causes process hang and memory exhaustionEPSS 0.4%CVE-2026-102277MEDIUMbrace-expansion: Quadratic-time expansion of the `{a},b}` rewrite causes CPU denial of serviceEPSS 0.4%