Fix brace-expansion vulnerability in mocha dependency#1857
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wenytang-ms
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Apr 14, 2026
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Summary
Fix a vulnerability in
brace-expansion(transitive dependency viamocha -> minimatch -> brace-expansion@2.0.2).Vulnerability
A brace pattern with a zero step value (e.g.,
{1..2..0}) causes the sequence generation loop to run indefinitely, making the process hang and allocate ~1.9 GB of memory before throwing aRangeError. This affects any application that passes untrusted strings toexpand().Fix
Added
brace-expansionoverride undermochainpackage.jsonto force resolution to>=2.0.3, which sanitizes a step increment of 0 to 1 (matching bash behavior). The resolved version is now5.0.5.