# CVE-2026-45149: node-brace-expansion: The brace-expansion library generates arbitrary strings containing a common prefix and suffix

CVE-2026-45149 is fixed in node-brace-expansion on 1 platform by DEBIAN-CVE-2026-45149 (version 2.0.3+~1.1.2-3), released June 27, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-45149
- Priority: High
- CVSS: 7.5 (high)
- EPSS: 0.0030
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 29, 2026

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | node-brace-expansion Debian 14 | 2.0.3+~1.1.2-3 | [DEBIAN-CVE-2026-45149](https://patchblox.com/security/data/fix/linux/debian-cve-2026-45149.md) | Jun 27, 2026 |

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Data as of 2026-11-08T00:53:09Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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