medium6.5
CVE-2026-45149
The brace-expansion library generates arbitrary strings containing a common prefix and suffix.
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | brace-expansion | >= 5.0.0, < 5.0.6 | 5.0.6 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Juliangruber | Brace-Expansion | from 5.0.0 before 5.0.6 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-jxxr-4gwj-5jf2
- https://github.com/juliangruber/brace-expansion/security/advisories/GHSA-jxxr-4gwj-5jf2
- https://github.com/juliangruber/brace-expansion/commit/c0b095bdc52bc4c36dc88deddbadabc49f8371e5
- https://nvd.nist.gov/vuln/detail/CVE-2026-45149