Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Juliangruber | Brace-Expansion | >= 5.0.0, < 5.0.6 |
Related Weaknesses (CWE)
References
- https://github.com/juliangruber/brace-expansion/security/advisories/GHSA-jxxr-4gMitigationVendor Advisory
FAQ
What is CVE-2026-45149?
CVE-2026-45149 is a vulnerability with a CVSS score of 6.5 (MEDIUM). 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 nume...
How severe is CVE-2026-45149?
CVE-2026-45149 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-45149?
Check the references section above for vendor advisories and patch information. Affected products include: Juliangruber Brace-Expansion.