Resource exhaustion in Juliangruber Brace-Expansion
CVE-2026-45149
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.
Vulnerability class: DoS (Denial of Service)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.004 (28.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 28th percentile — 28.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Juliangruber Brace-Expansion — versions >= 5.0.0, < 5.0.6
Weakness classification (CWE)
References
- github.com/juliangruber/brace-expansion/security/advisories/GHSA-jxxr-4gwj-5jf2 (Mitigation, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-45149?
- CVE-2026-45149 is a medium-severity vulnerability in Juliangruber Brace-Expansion, classified under Uncontrolled Resource Consumption. CVSS score: 6.5/10. Published 2026-05-29.
- How severe is CVE-2026-45149?
- Medium severity. CVSS v3 base score is 6.5 out of 10.