REDHAT-BUG-2506433: High severity npm/brace-expansion vulnerability
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.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
brace-expansionto a version that resolves this vulnerability.Fixed in 5.0.8 - Configuration
When calling brace-expansion.expand() (including via minimatch/glob brace patterns), set the maxLength option to limit accumulated output and intermediate arrays to prevent fatal out-of-memory crashes (default in 5.0.8 is 4,000,000).
brace-expansion.expand() maxLength = 4000000