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Vulnerability record · CVE-2026-33750 · published 27 March 2026

CVE-2026-33750: Juliangruber brace-expansion uncontrolled resource consumption vulnerability

Juliangruber · Brace Expansion

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.

7.5 CVSS 3.1 High EPSS 0.61% · top 52.7% CWE-400 · Uncontrolled resource consumption
7.5CVSS 3.1 base score
0.61%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
10References
17 Jun 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/juliangruber/brace-expansion/blob/daa71bcb4a30a2df9bcb7f7b8daaf2ab30e5794a/src/index.ts#L107-L113 Patch
https://github.com/juliangruber/brace-expansion/blob/daa71bcb4a30a2df9bcb7f7b8daaf2ab30e5794a/src/index.ts#L184 Patch
https://github.com/juliangruber/brace-expansion/commit/311ac0d54994158c0a384e286a7d6cbb17ee8ed5 Patch
https://github.com/juliangruber/brace-expansion/commit/7fd684f89fdde3549563d0a6522226a9189472a2 Patch
https://github.com/juliangruber/brace-expansion/commit/b9cacd9e55e7a1fa588fe4b7bb1159d52f1d902a Patch
https://github.com/juliangruber/brace-expansion/issues/98 Issue Tracking
https://github.com/juliangruber/brace-expansion/pull/95 Issue TrackingPatch
https://github.com/juliangruber/brace-expansion/pull/96 Issue TrackingPatch
https://github.com/juliangruber/brace-expansion/pull/97 Issue TrackingPatch
https://github.com/juliangruber/brace-expansion/security/advisories/GHSA-f886-m6hf-6m8v MitigationVendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2026-33750), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.