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

MITRE NVD CVE.ORG Print: PDF PDF

Summary

CVECVE-2026-33750
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-03-27 15:16:57 UTC
Updated2026-03-30 13:26:29 UTC
DescriptionThe 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.

Risk And Classification

Primary CVSS: v3.1 6.5 MEDIUM from [email protected]

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

EPSS: 0.000580000 probability, percentile 0.184610000 (date 2026-04-02)

Problem Types: CWE-400 | CWE-400 CWE-400: Uncontrolled Resource Consumption

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
3.1CNADECLARED6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Juliangruber Brace-expansion affected >= 4.0.0, < 5.0.5 Not specified
CNA Juliangruber Brace-expansion affected >= 3.0.0, < 3.0.2 Not specified
CNA Juliangruber Brace-expansion affected >= 2.0.0, < 2.0.3 Not specified
CNA Juliangruber Brace-expansion affected < 1.1.13 Not specified

References

ReferenceSourceLinkTags
github.com/juliangruber/brace-expansion/blob/daa71bcb4a30a2df9bcb7f7b8da... [email protected] github.com
github.com/juliangruber/brace-expansion/commit/7fd684f89fdde3549563d0a65... [email protected] github.com
github.com/juliangruber/brace-expansion/security/advisories/GHSA-f886-m6... [email protected] github.com
github.com/juliangruber/brace-expansion/commit/311ac0d54994158c0a384e286... [email protected] github.com
github.com/juliangruber/brace-expansion/commit/b9cacd9e55e7a1fa588fe4b7b... [email protected] github.com
github.com/juliangruber/brace-expansion/issues/98 [email protected] github.com
github.com/juliangruber/brace-expansion/pull/95 [email protected] github.com
github.com/juliangruber/brace-expansion/blob/daa71bcb4a30a2df9bcb7f7b8da... [email protected] github.com
github.com/juliangruber/brace-expansion/pull/97 [email protected] github.com
github.com/juliangruber/brace-expansion/pull/96 [email protected] github.com
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