brace-expansion: Zero-step sequence causes process hang and memory exhaustion
Impact
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 for seconds and allocate heaps of memory.
The loop in question:
test() is one of
The increment is computed as Math.abs(0) = 0, so the loop variable never advances. On a test machine, the process hangs for about 3.5 seconds and allocates roughly 1.9 GB of memory before throwing a RangeError. Setting max to any value has no effect because the limit is only checked at the output combination step, not during sequence generation.
This affects any application that passes untrusted strings to expand(), or by error sets a step value of 0. That includes tools built on minimatch/glob that resolve patterns from CLI arguments or config files. The input needed is just 10 bytes.
Patches
Upgrade to versions
- 5.0.5+
A step increment of 0 is now sanitized to 1, which matches bash behavior.
Workarounds
Sanitize strings passed to expand() to ensure a step value of 0 is not used.
Software afectado
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| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Paquete de npm | brace-expansion | >= 4.0.0, < 5.0.5, >= 3.0.0, < 3.0.2, >= 2.0.0, < 2.0.3, < 1.1.13 | 5.0.5, 3.0.2, 2.0.3, 1.1.13 |
Referencias
- https://github.com/juliangruber/brace-expansion/security/advisories/GHSA-f886-m6hf-6m8v
- https://nvd.nist.gov/vuln/detail/CVE-2026-33750
- https://github.com/juliangruber/brace-expansion/issues/98
- https://github.com/juliangruber/brace-expansion/pull/95
- https://github.com/juliangruber/brace-expansion/pull/96
- https://github.com/juliangruber/brace-expansion/pull/97
- https://github.com/juliangruber/brace-expansion/commit/311ac0d54994158c0a384e286a7d6cbb17ee8ed5
- https://github.com/juliangruber/brace-expansion/commit/7fd684f89fdde3549563d0a6522226a9189472a2
- https://github.com/juliangruber/brace-expansion/commit/b9cacd9e55e7a1fa588fe4b7bb1159d52f1d902a
- https://github.com/juliangruber/brace-expansion
- https://github.com/juliangruber/brace-expansion/blob/daa71bcb4a30a2df9bcb7f7b8daaf2ab30e5794a/src/index.ts#L107-L113
- https://github.com/juliangruber/brace-expansion/blob/daa71bcb4a30a2df9bcb7f7b8daaf2ab30e5794a/src/index.ts#L184
- Vector CVSS
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H- Debilidad (CWE)
CWE-400- Plataforma
- npm
- Paquete
brace-expansion- Publicada
- 26.03.2026
- Actualizado
- 11.10.2026 10:22
Fuentes y licencias
OSV / GitHub Advisory Database - GHSA-f886-m6hf-6m8v - CC BY 4.0
Historial de vulnerabilidades: brace-expansion
Todas las vulnerabilidades publicadas de este paquete (Paquete de npm), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.
- Entradas en total
- 10
- Primera → última
- 01.2018 09.2026
- Sin corrección
- 0
- Explotada en ataques
- 0
Distribución por gravedad
- Alta 6
- Media 3
- Baja 1
Divulgaciones por año
- 2018: 1
- 2019: 0
- 2020: 0
- 2021: 0
- 2022: 0
- 2023: 0
- 2024: 0
- 2025: 1
- 2026: 8
-
brace-expansion: Zero-step sequence causes process hang and memory exhaustion esta entrada
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