CVE-2026-4926 (GCVE-0-2026-4926)

Vulnerability from cvelistv5 – Published: 2026-03-26 18:59 – Updated: 2026-06-30 12:10
VLAI
Title
path-to-regexp vulnerable to Denial of Service via sequential optional groups
Summary
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.
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-400 - Uncontrolled Resource Consumption
  • CWE-1333 - Inefficient Regular Expression Complexity
Assigner
References
Impacted products
Vendor Product Version
path-to-regexp path-to-regexp Affected: 8.0.0 , < 8.4.0 (semver)
Unaffected: 8.4.0 (semver)
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Red Hat Red Hat Ansible Automation Platform 2.5 for RHEL 8     cpe:/a:redhat:ansible_automation_platform:2.5::el8
    cpe:/a:redhat:ansible_automation_platform_developer:2.5::el8
    cpe:/a:redhat:ansible_automation_platform_inside:2.5::el8
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Red Hat Red Hat Ansible Automation Platform 2.5 for RHEL 9     cpe:/a:redhat:ansible_automation_platform:2.5::el9
    cpe:/a:redhat:ansible_automation_platform_developer:2.5::el9
    cpe:/a:redhat:ansible_automation_platform_inside:2.5::el9
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Red Hat Red Hat Ansible Automation Platform 2.6 for RHEL 9     cpe:/a:redhat:ansible_automation_platform:2.6::el9
    cpe:/a:redhat:ansible_automation_platform_developer:2.6::el9
    cpe:/a:redhat:ansible_automation_platform_inside:2.6::el9
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Red Hat Cryostat 4 on RHEL 9     cpe:/a:redhat:cryostat:4::el9
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Red Hat Migration Toolkit for Virtualization 2.1     cpe:/a:redhat:migration_toolkit_virtualization:2.10::el9
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Red Hat Migration Toolkit for Virtualization 2.9     cpe:/a:redhat:migration_toolkit_virtualization:2.9::el9
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Red Hat Red Hat Ansible Automation Platform 2.6     cpe:/a:redhat:ansible_automation_platform:2.6::el9
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Red Hat Red Hat Developer Hub 1.8     cpe:/a:redhat:rhdh:1.8::el9
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Red Hat Red Hat Developer Hub 1.9     cpe:/a:redhat:rhdh:1.9::el9
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Red Hat Red Hat OpenShift Dev Spaces 3.27     cpe:/a:redhat:openshift_devspaces:3.27::el9
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Red Hat Red Hat OpenShift distributed tracing 3.9.3     cpe:/a:redhat:openshift_distributed_tracing:3.9::el9
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Red Hat Red Hat Trusted Artifact Signer 1.3     cpe:/a:redhat:trusted_artifact_signer:1.3::el9
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Red Hat Logging Subsystem for Red Hat OpenShift     cpe:/a:redhat:logging:5
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Red Hat Migration Toolkit for Applications 8     cpe:/a:redhat:migration_toolkit_applications:8
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Red Hat Multicluster Engine for Kubernetes     cpe:/a:redhat:multicluster_engine
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Red Hat OpenShift Pipelines     cpe:/a:redhat:openshift_pipelines:1
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Red Hat Red Hat Advanced Cluster Management for Kubernetes 2     cpe:/a:redhat:acm:2
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Red Hat Red Hat AMQ Broker 7     cpe:/a:redhat:amq_broker:7
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Red Hat Red Hat Ansible Automation Platform 2     cpe:/a:redhat:ansible_automation_platform:2
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Red Hat Red Hat Build of Podman Desktop     cpe:/a:redhat:podman_desktop:1
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Red Hat Red Hat Data Grid 8     cpe:/a:redhat:jboss_data_grid:8
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Red Hat Red Hat Developer Hub     cpe:/a:redhat:rhdh:1
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Red Hat Red Hat Edge Manager 1     cpe:/a:redhat:edge_manager:1
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Red Hat Red Hat Enterprise Linux 9     cpe:/o:redhat:enterprise_linux:9
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Red Hat Red Hat Fuse 7     cpe:/a:redhat:jboss_fuse:7
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Red Hat Red Hat OpenShift AI (RHOAI)     cpe:/a:redhat:openshift_ai
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Red Hat Red Hat OpenShift Container Platform 4     cpe:/a:redhat:openshift:4
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Red Hat Red Hat Openshift Data Foundation 4     cpe:/a:redhat:openshift_data_foundation:4
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Red Hat Red Hat OpenShift GitOps     cpe:/a:redhat:openshift_gitops:1
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Red Hat Red Hat Single Sign-On 7     cpe:/a:redhat:red_hat_single_sign_on:7
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Red Hat Self-service automation portal 2     cpe:/a:redhat:ansible_portal:2
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Red Hat Red Hat Ansible Automation Platform 2.6 for RHEL 10     cpe:/a:redhat:ansible_automation_platform:2.6::el10
    cpe:/a:redhat:ansible_automation_platform_developer:2.6::el10
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Red Hat Cryostat 4     cpe:/a:redhat:cryostat:4
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Red Hat Network Observability Operator     cpe:/a:redhat:network_observ_optr:1
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Red Hat OpenShift Lightspeed     cpe:/a:redhat:openshift_lightspeed
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Red Hat OpenShift Service Mesh 2     cpe:/a:redhat:service_mesh:2
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Red Hat OpenShift Service Mesh 3     cpe:/a:redhat:service_mesh:3
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Red Hat Red Hat Advanced Cluster Security 4     cpe:/a:redhat:advanced_cluster_security:4
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Red Hat Red Hat build of Apache Camel - HawtIO 4     cpe:/a:redhat:apache_camel_hawtio:4
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Red Hat Red Hat build of Apicurio Registry 2     cpe:/a:redhat:service_registry:2
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Red Hat Red Hat Enterprise Linux 10     cpe:/o:redhat:enterprise_linux:10
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Red Hat Red Hat Enterprise Linux 8     cpe:/o:redhat:enterprise_linux:8
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Red Hat Red Hat JBoss Enterprise Application Platform 7     cpe:/a:redhat:jboss_enterprise_application_platform:7
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Red Hat Red Hat JBoss Enterprise Application Platform 8     cpe:/a:redhat:jboss_enterprise_application_platform:8
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Red Hat Red Hat JBoss Enterprise Application Platform Expansion Pack     cpe:/a:redhat:jbosseapxp
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Red Hat Red Hat OpenShift Virtualization 4     cpe:/a:redhat:container_native_virtualization:4
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Red Hat Red Hat Process Automation 7     cpe:/a:redhat:jboss_enterprise_bpms_platform:7
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Red Hat Red Hat Quay 3     cpe:/a:redhat:quay:3
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Red Hat Red Hat Satellite 6     cpe:/a:redhat:satellite:6
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Red Hat Red Hat Trusted Profile Analyzer     cpe:/a:redhat:trusted_profile_analyzer:2
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Credits
uug4na blakeembrey UlisesGascon
Show details on NVD website

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              "cpe:/a:redhat:service_mesh:3"
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}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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Detection rules are retrieved from Rulezet.

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