Vulnerability Details 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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 10.4%
CVSS Severity
CVSS v3 Score 6.5
Products affected by CVE-2026-45149
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cpe:2.3:a:juliangruber:brace-expansion:5.0.0
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cpe:2.3:a:juliangruber:brace-expansion:5.0.2
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cpe:2.3:a:juliangruber:brace-expansion:5.0.3
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cpe:2.3:a:juliangruber:brace-expansion:5.0.4
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cpe:2.3:a:juliangruber:brace-expansion:5.0.5