CVE-2026-4926

Fixed in a distro release EPSS <1%CVSS 7.5

Impact: A bad regular expression is generated any time you have multiple sequential optional groups (curly brace syntax), such as `{a}{b}{c}:z`. The generated regex grows exponentially with the number of groups, causing denial of service. Patches: Fixed in version 8.4.0. Workarounds: Limit the number of sequential optional groups in route patterns. Avoid passing user-controlled input as route patterns.

Published 2026-03-26 · CVE record · OSV

Products: path-to-regexp, Red Hat Cryostat 4 on RHEL 9, Red Hat Ansible Automation Platform 2.5 for RHEL 8, Red Hat Ansible Automation Platform 2.5 for RHEL 9, Red Hat Ansible Automation Platform 2.6 for RHEL 9, Red Hat Migration Toolkit for Virtualization 2.1, Red Hat Migration Toolkit for Virtualization 2.9, Red Hat Ansible Automation Platform 2.6, Red Hat Developer Hub 1.8, Red Hat Developer Hub 1.9, Red Hat Edge Manager 1.0, Red Hat Edge Manager 1.1, Red Hat Migration Toolkit for Applications 8.1, Red Hat OpenShift AI 2.25, Red Hat OpenShift Dev Spaces 3.27, Red Hat OpenShift distributed tracing 3.9.3, Red Hat Trusted Artifact Signer 1.3, Red Hat Cryostat 4, Logging Subsystem for Red Hat OpenShift, Red Hat Multicluster Engine for Kubernetes, Red Hat Network Observability Operator, Red Hat OpenShift Lightspeed, Red Hat OpenShift Pipelines, Red Hat OpenShift Service Mesh 2, Red Hat OpenShift Service Mesh 3, Red Hat Advanced Cluster Management for Kubernetes 2, Red Hat Advanced Cluster Security 4, Red Hat AMQ Broker 7, Red Hat Ansible Automation Platform 2, Red Hat build of Apache Camel - HawtIO 4, Red Hat build of Apicurio Registry 2, Red Hat Build of Podman Desktop, Red Hat Data Grid 8, Red Hat Developer Hub, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat Fuse 7, Red Hat JBoss Enterprise Application Platform 7, Red Hat JBoss Enterprise Application Platform 8, Red Hat JBoss Enterprise Application Platform Expansion Pack, Red Hat OpenShift AI (RHOAI), Red Hat OpenShift Container Platform 4, Red Hat Openshift Data Foundation 4, Red Hat OpenShift GitOps, Red Hat OpenShift Virtualization 4, Red Hat Process Automation 7, Red Hat Quay 3, Red Hat Satellite 6, Red Hat Single Sign-On 7, Red Hat Trusted Profile Analyzer, Red Hat Self-service automation portal 2

Fixed upstream

Distro releases