brace-expansion: Large numeric range defeats documented `max` DoS protection

高 7.5CVE-2026-45149 · GHSA-jxxr-4gwj-5jf2 · 29/05/2026 公開 · 22/07/2026 更新

要点

CVE-2026-45149 は brace-expansion (juliangruber), brace-expansion に影響する深刻度「高」 (CVSS 7.5) の脆弱性です。
今後30日間に悪用される確率（EPSS）：0.30%（全脆弱性の 22.9% より高い）。
対処：5.0.6 以降に更新してください。

パッケージ	影響を受けるバージョン	修正済みバージョン
brace-expansion juliangruber	`≥ 5.0.0, < 5.0.6`	`5.0.6`
brace-expansion npm	`≥ 5.0.0, < 5.0.6`	`5.0.6`

概要

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.

Workaround

Ensure the string to be expanded doesn't contain more values than the desired max item count.

NVD の説明

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.