CVE-2026-33750
Description
A flaw was found in the brace-expansion library, a component used for generating strings based on patterns. A remote attacker could exploit this vulnerability by providing a specially crafted brace pattern that includes a zero step value. This malicious input causes the library's sequence generation loop to run indefinitely, leading to excessive memory allocation and causing the process to hang. This results in a Denial of Service (DoS) for the affected application.
Statement
This vulnerability has been rated as Moderate by Red Hat. The vulnerability requires parsing a malformed pattern that, when parsed, leads to infinite looping, excessive memory allocation, and could result in a DoS. The flaw is rated as Moderate because the vulnerable code in the brace-expansion library is not exposed directly as a network service, rather it needs to be called by another application; therefore, some user/system interaction is required to cause the malicious string to be processed.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 6.5 | 7.5 | 6.5 |
| Attack Vector | Network | Network | Network |
| Attack Complexity | Low | Low | Low |
| Privileges Required | None | None | None |
| User Interaction | Required | None | Required |
| Scope | Unchanged | Unchanged | Unchanged |
| Confidentiality | None | None | None |
| Integrity Impact | None | None | None |
| Availability Impact | High | High | High |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
NVD: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Understanding the Weakness (CWE)
Availability
Technical Impact: DoS: Resource Consumption (CPU)
Frequently Asked Questions
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