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Medium severity6.5GHSA Advisory· Published May 29, 2026· Updated Jun 12, 2026

CVE-2026-45149

CVE-2026-45149

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.

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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
brace-expansionnpm
>= 5.0.0, < 5.0.65.0.6

Affected products

38

Patches

Vulnerability mechanics

References

4

News mentions

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