CVE-2026-45149
Medium
Description
The brace-expansion library generates arbitrary strings containing a common prefix and suffix. From 5.0.0 to before 5.0.6, the max option was being applied too late. When expanding a single large numeric range like {1..10000000}, the sequence generation loop generates all 10 million intermediate elements before the max limit is applied With max=10, the output is correctly limited to 10 items, but the process still allocates ~505 MB and spends ~800ms building the full intermediate array. This vulnerability is fixed in 5.0.6.
SeverityMedium
CVSS6.5
Exploit probability—
ProductJuliangruber Brace-expansion
PublishedMay 29, 2026
First seenMay 29, 2026
Weakness typeCWE-400Uncontrolled resource consumption
How to fix
Update
- juliangruber brace-expansion5.0.6 or later
- brace-expansion5.0.6 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| juliangruber brace-expansion | 5.0.0 ≤ v < 5.0.6 | 5.0.6 |
| brace-expansionnpm | 5.0.0 ≤ v < 5.0.6 | 5.0.6 |
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