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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.

PUBLISHED Reserved 2026-03-23 | Published 2026-03-27 | Updated 2026-03-27 | Assigner GitHub_M




MEDIUM: 6.5CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Problem types

CWE-400: Uncontrolled Resource Consumption

Product status

>= 4.0.0, < 5.0.5
affected

>= 3.0.0, < 3.0.2
affected

>= 2.0.0, < 2.0.3
affected

< 1.1.13
affected

References

github.com/...ansion/security/advisories/GHSA-f886-m6hf-6m8v

github.com/juliangruber/brace-expansion/issues/98

github.com/juliangruber/brace-expansion/pull/95

github.com/juliangruber/brace-expansion/pull/96

github.com/juliangruber/brace-expansion/pull/97

github.com/...ommit/311ac0d54994158c0a384e286a7d6cbb17ee8ed5

github.com/...ommit/7fd684f89fdde3549563d0a6522226a9189472a2

github.com/...ommit/b9cacd9e55e7a1fa588fe4b7bb1159d52f1d902a

github.com/...b4a30a2df9bcb7f7b8daaf2ab30e5794a/src/index.ts

github.com/...b4a30a2df9bcb7f7b8daaf2ab30e5794a/src/index.ts

cve.org (CVE-2026-33750)

nvd.nist.gov (CVE-2026-33750)

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