AIKIDO-2026-189646
brace-expansion is vulnerable to Denial of Service (DoS)
53
Medium Risk
This Affects:
brace-expansionTL;DR
The brace expansion parser rewrites and rescans its input whenever it matches a trailing {group},b} pattern, restarting the scan without limiting how many times this can happen. A crafted input such as {a} followed by many closing braces triggers thousands of rescans over a string that grows on each pass, driving CPU use to quadratic growth and blocking the event loop for tens of seconds on a single call. The patch adds a maxRewrites bound that caps the number of rescans.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range.
Background info
brace-expansion is vulnerable to Denial of Service (DoS) in versions 0.0.1 - 1.1.20, 2.0.0 - 2.1.6, 3.0.0 - 3.0.8 and 4.0.0 - 5.0.11.
How to fix this
Upgrade the brace-expansion library to the patch version.
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