Inefficient regular expression complexity in picomatch - CVE-2026-33671

Vulnerability identifier: #VU139384

CSH Severity: Medium

CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-33671

CWE-ID: CWE-1333

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to improper input validation in extglob quantifier handling when parsing input. A remote attacker can send a specially crafted pattern to cause a denial of service.

picomatch
Confluence Data Center
IBM Business Automation Workflow
IBM Automation Decision Services
IBM QRadar Data Synchronization App

Install security update from vendor's website.

picomatch - addressed in versions 2.3.2, 3.0.2, 4.0.4
Confluence Data Center - addressed in versions 9.2.22, 10.2.14
IBM Business Automation Workflow - addressed in versions 24.0.0-IF009, 24.0.1-IF008, 25.0.0-IF005, 26.0.0.0
IBM Automation Decision Services - addressed in versions 24.0.0.0.9, 24.0.1.0.8, 25.0.0.0.4
IBM QRadar Data Synchronization App - update to 4.0.0

• https://github.com/advisories/GHSA-c2c7-rcm5-vvqj

• Inefficient regular expression complexity in picomatch
• Multiple vulnerabilities in Confluence Data Center
• Multiple vulnerabilities in IBM QRadar Data Synchronization App
• Multiple vulnerabilities in IBM Automation Decision Services
• Multiple vulnerabilities in IBM Business Automation Workflow