CVE-2026-33750
MEDIUMbrace-expansion: Zero-step sequence causes process hang and memory exhaustion
Title source: cnaDescription
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