CVE-2026-33750

MEDIUM

brace-expansion: Zero-step sequence causes process hang and memory exhaustion

Title source: cna
STIX 2.1

Description

The brace-expansion library generates arbitrary strings containing a common prefix and suffix. Prior to versions 5.0.5, 3.0.2, 2.0.3, and 1.1.13, 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. Versions 5.0.5, 3.0.2, 2.0.3, and 1.1.13 fix the issue. As a workaround, sanitize strings passed to `expand()` to ensure a step value of `0` is not used.

Scores

CVSS v3 6.5
EPSS 0.0002
EPSS Percentile 6.6%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-400
Status published
Products (5)
juliangruber/brace-expansion < 1.1.13 (2 CPE variants)
juliangruber/brace-expansion >= 2.0.0, < 2.0.3
juliangruber/brace-expansion >= 3.0.0, < 3.0.2
juliangruber/brace-expansion >= 4.0.0, < 5.0.5
npm/brace-expansion 4.0.0 - 5.0.5npm
Published Mar 27, 2026
Tracked Since Mar 29, 2026