--- id: CVE-2026-75931 title: >- fast-uri: fast-uri: Host confusion via skipped IDN canonicalization (CVE-2026-75931) summary: >- A flaw was found in fast-uri, a URI parser for Node.js. This vulnerability arises because the parser fails to consistently convert internationalized domain names (IDN) to their standard ASCII form when processing scheme-relative references… severity: high cvss: 7.5 cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N' cvssSource: vendor cwe: - CWE-444 - CWE-436 vendor: Red Hat product: Red Hat OpenShift AI (RHOAI) affected: - cost_management_on_premise - multicluster_engine_for_kubernetes - openshift_lightspeed - openshift_pipelines - openshift_serverless - ansible_automation_platform 2 - build_of_podman_desktop - developer_hub - enterprise_linux 10 - enterprise_linux 9 - enterprise_linux_ai_rhel_ai 3 - openshift_ai_rhoai - openshift_container_platform 4 - openshift_data_foundation 4 - openshift_dev_spaces - satellite 6 - secrets_management_console_for_red_hat_openshift - self_service_automation_portal 2 - network_observability_netobserv 1.12.3 - advanced_cluster_management_for_kubernetes 2.16 - advanced_cluster_management_for_kubernetes 2.17 - ansible_automation_platform 2.1 - ansible_automation_platform 2.2 - ansible_automation_platform 2.6 - ansible_automation_platform 2.7 - developer_hub 1.9 - discovery 2 - edge_manager 1.1 - edge_manager 1.2 - hardened_images - migration_toolkit 1.8 - openshift_container_platform 4.21 - openshift_container_platform 4.22 - openshift_dev_spaces 3.30 - satellite 6.18 - satellite 6.19 patched: - network_observability_netobserv 1.12.3 - advanced_cluster_management_for_kubernetes 2.16 - advanced_cluster_management_for_kubernetes 2.17 - ansible_automation_platform 2.1 - ansible_automation_platform 2.2 - ansible_automation_platform 2.6 - ansible_automation_platform 2.7 - developer_hub 1.9 - discovery 2 - edge_manager 1.1 - edge_manager 1.2 - hardened_images - migration_toolkit 1.8 - openshift_container_platform 4.21 - openshift_container_platform 4.22 - openshift_dev_spaces 3.30 - satellite 6.18 - satellite 6.19 published: '2026-08-24' updated: '2026-09-24' sourceUpdated: '2026-09-24T06:02:15+00:00' source: CSAF sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-75931.json' references: - url: >- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-75931.json - url: 'https://access.redhat.com/security/cve/CVE-2026-75931' - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2521777' - url: 'https://www.cve.org/CVERecord?id=CVE-2026-75931' - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-75931' - url: 'https://cna.openjsf.org/security-advisories.html' - url: >- https://github.com/fastify/fast-uri/security/advisories/GHSA-5jgf-p345-68v8 - url: 'https://access.redhat.com/errata/RHSA-2026:70593' - url: 'https://access.redhat.com/errata/RHSA-2026:67542' - url: 'https://access.redhat.com/errata/RHSA-2026:67543' - url: 'https://access.redhat.com/errata/RHSA-2026:65118' - url: 'https://access.redhat.com/errata/RHSA-2026:65155' - url: 'https://access.redhat.com/errata/RHSA-2026:71179' - url: 'https://access.redhat.com/errata/RHSA-2026:67279' - url: 'https://access.redhat.com/errata/RHSA-2026:69248' - url: 'https://access.redhat.com/errata/RHSA-2026:61783' - url: 'https://access.redhat.com/errata/RHSA-2026:68044' - url: 'https://access.redhat.com/errata/RHSA-2026:68253' - url: 'https://access.redhat.com/errata/RHSA-2026:68006' - url: 'https://access.redhat.com/errata/RHSA-2026:68254' - url: 'https://access.redhat.com/errata/RHSA-2026:60866' - url: 'https://access.redhat.com/errata/RHSA-2026:60855' - url: 'https://access.redhat.com/errata/RHSA-2026:60856' - url: 'https://access.redhat.com/errata/RHSA-2026:68681' - url: 'https://access.redhat.com/errata/RHSA-2026:68547' - url: 'https://access.redhat.com/errata/RHSA-2026:68553' - url: 'https://access.redhat.com/errata/RHSA-2026:68754' - url: 'https://access.redhat.com/errata/RHSA-2026:68762' - url: 'https://access.redhat.com/errata/RHSA-2026:68756' - url: 'https://access.redhat.com/errata/RHSA-2026:68766' - url: 'https://access.redhat.com/errata/RHSA-2026:68765' - url: 'https://access.redhat.com/errata/RHSA-2026:68748' - url: 'https://access.redhat.com/errata/RHSA-2026:68750' - url: 'https://access.redhat.com/errata/RHSA-2026:68747' - url: >- https://github.com/fastify/fast-uri/commit/0256bc8d1f28b5d0ac657faf67e2411a189dfcb5 - url: >- https://github.com/fastify/fast-uri/commit/444ecdad447db2cc23c4d422acc6f0daa6fa8eef - url: >- https://github.com/fastify/fast-uri/commit/4e4ebd8b245f6ca16e448203559eea3e545453a3 - url: 'https://github.com/fastify/fast-uri/releases/tag/v2.4.5' - url: 'https://github.com/fastify/fast-uri/releases/tag/v3.1.6' - url: 'https://github.com/fastify/fast-uri/releases/tag/v4.1.3' - url: 'https://github.com/advisories/GHSA-5jgf-p345-68v8' tags: - csaf - vex - red-hat - ghsa - npm epss: 0.00398 epssPercentile: 0.31182 aliases: - GHSA-5jgf-p345-68v8 ecosystem: npm ingestedAt: '2026-09-02T15:46:29.185Z' --- ## Overview A flaw was found in fast-uri, a URI parser for Node.js. This vulnerability arises because the parser fails to consistently convert internationalized domain names (IDN) to their standard ASCII form when processing scheme-relative references. This inconsistency can lead to host confusion, where an application might validate a URI against a security policy using one hostname, but then resolve to a different, potentially malicious, hostname. This discrepancy could allow an attacker to bypass security policies and access unauthorized resources. ## Vendor advisories - **RHSA-2026:70593** · Red Hat · fixed in: Network Observability (NETOBSERV) 1.12.3 · released 2026-09-23 · [advisory](https://access.redhat.com/errata/RHSA-2026:70593) - **RHSA-2026:67542** · Red Hat · fixed in: Red Hat Advanced Cluster Management for Kubernetes 2.16 · released 2026-09-15 · [advisory](https://access.redhat.com/errata/RHSA-2026:67542) - **RHSA-2026:67543** · Red Hat · fixed in: Red Hat Advanced Cluster Management for Kubernetes 2.17 · released 2026-09-15 · [advisory](https://access.redhat.com/errata/RHSA-2026:67543) - **RHSA-2026:65118** · Red Hat · fixed in: Red Hat Ansible Automation Platform 2.1 · released 2026-09-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:65118) - **RHSA-2026:65155** · Red Hat · fixed in: Red Hat Ansible Automation Platform 2.2 · released 2026-09-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:65155) - **RHSA-2026:71179** · Red Hat · fixed in: Red Hat Ansible Automation Platform 2.6 · released 2026-09-23 · [advisory](https://access.redhat.com/errata/RHSA-2026:71179) - **RHSA-2026:67279** · Red Hat · fixed in: Red Hat Ansible Automation Platform 2.7 · released 2026-09-14 · [advisory](https://access.redhat.com/errata/RHSA-2026:67279) - **RHSA-2026:69248** · Red Hat · fixed in: Red Hat Developer Hub 1.9 · released 2026-09-21 · [advisory](https://access.redhat.com/errata/RHSA-2026:69248) - **RHSA-2026:61783** · Red Hat · fixed in: Red Hat Discovery 2 · released 2026-08-31 · [advisory](https://access.redhat.com/errata/RHSA-2026:61783) - **RHSA-2026:68044** · Red Hat · fixed in: Red Hat Edge Manager 1.1 · released 2026-09-16 · [advisory](https://access.redhat.com/errata/RHSA-2026:68044) - **RHSA-2026:68253** · Red Hat · fixed in: Red Hat Edge Manager 1.1 · released 2026-09-16 · [advisory](https://access.redhat.com/errata/RHSA-2026:68253) - **Red Hat VEX** · Important · affected: Cost Management On Premise, Multicluster Engine for Kubernetes, OpenShift Lightspeed, OpenShift Pipelines, OpenShift Serverless, Red Hat Ansible Automation Platform 2, … · no fix planned: Red Hat Ansible Automation Platform 2, Secrets Management Console for Red Hat OpenShift, Red Hat Enterprise Linux 10, Cost Management On Premise, … · updated 2026-09-24 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-75931.json) - **RHSA-2026:68006** · Red Hat · fixed in: Red Hat Edge Manager 1.2 · released 2026-09-16 · [advisory](https://access.redhat.com/errata/RHSA-2026:68006) - **RHSA-2026:68254** · Red Hat · fixed in: Red Hat Edge Manager 1.2 · released 2026-09-16 · [advisory](https://access.redhat.com/errata/RHSA-2026:68254) - **RHSA-2026:60866** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-08-29 · [advisory](https://access.redhat.com/errata/RHSA-2026:60866) - **RHSA-2026:60855** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-08-29 · [advisory](https://access.redhat.com/errata/RHSA-2026:60855) - **RHSA-2026:60856** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-08-29 · [advisory](https://access.redhat.com/errata/RHSA-2026:60856) **fast-uri: fast-uri: Host confusion via skipped IDN canonicalization** — rated Important by Red Hat. Released 2026-08-24, updated 2026-09-24. Affected: - Cost Management On Premise - Multicluster Engine for Kubernetes - OpenShift Lightspeed - OpenShift Pipelines - OpenShift Serverless - Red Hat Ansible Automation Platform 2 - Red Hat Build of Podman Desktop - Red Hat Developer Hub - Red Hat Enterprise Linux 10 - Red Hat Enterprise Linux 9 - Red Hat Enterprise Linux AI (RHEL AI) 3 - Red Hat OpenShift AI (RHOAI) - Red Hat OpenShift Container Platform 4 - Red Hat Openshift Data Foundation 4 - Red Hat OpenShift Dev Spaces - Red Hat Satellite 6 - Secrets Management Console for Red Hat OpenShift - Self-service automation portal 2 Fixed: - Network Observability (NETOBSERV) 1.12.3 - Red Hat Advanced Cluster Management for Kubernetes 2.16 - Red Hat Advanced Cluster Management for Kubernetes 2.17 - Red Hat Ansible Automation Platform 2.1 - Red Hat Ansible Automation Platform 2.2 - Red Hat Ansible Automation Platform 2.6 - Red Hat Ansible Automation Platform 2.7 - Red Hat Developer Hub 1.9 - Red Hat Discovery 2 - Red Hat Edge Manager 1.1 - Red Hat Edge Manager 1.2 - Red Hat Hardened Images - Red Hat Migration Toolkit 1.8 - Red Hat OpenShift Container Platform 4.21 - Red Hat OpenShift Container Platform 4.22 - Red Hat OpenShift Dev Spaces 3.30 - Red Hat Satellite 6.18 - Red Hat Satellite 6.19 No fix planned: - Red Hat Ansible Automation Platform 2 - Secrets Management Console for Red Hat OpenShift - Red Hat Enterprise Linux 10 - Cost Management On Premise - Multicluster Engine for Kubernetes - OpenShift Lightspeed - OpenShift Pipelines - OpenShift Serverless - Red Hat Build of Podman Desktop - Red Hat Developer Hub - Red Hat Enterprise Linux 9 - Red Hat Enterprise Linux AI (RHEL AI) 3 - Red Hat OpenShift AI (RHOAI) - Red Hat OpenShift Container Platform 4 - Red Hat Openshift Data Foundation 4 - Red Hat OpenShift Dev Spaces - Red Hat Satellite 6 - Self-service automation portal 2 Not affected: - Network Observability (NETOBSERV) 1.12.3 - Red Hat Advanced Cluster Management for Kubernetes 2.16 - Red Hat Advanced Cluster Management for Kubernetes 2.17 - Red Hat Ansible Automation Platform 2.6 - Red Hat Ansible Automation Platform 2.7 - Red Hat Developer Hub 1.9 - Red Hat Discovery 2 - Red Hat Edge Manager 1.1 - Red Hat Edge Manager 1.2 - Red Hat Migration Toolkit 1.8 ## Remediation For details on how to apply this update, refer to: https://access.redhat.com/articles/11258 https://access.redhat.com/errata/RHSA-2026:70593 Before you apply this update, make sure all previously released errata that are relevant to your system are applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258 https://access.redhat.com/errata/RHSA-2026:67542 Before you apply this update, make sure all previously released errata that are relevant to your system are applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258 https://access.redhat.com/errata/RHSA-2026:67543 ## Package advisory (CVE-2026-75931) Affected packages: - `fast-uri >= 2.4.2, < 2.4.5` - `fast-uri >= 3.1.3, < 3.1.6` - `fast-uri >= 4.0.1, < 4.1.3` Patched in: - `fast-uri 2.4.5` - `fast-uri 3.1.6` - `fast-uri 4.1.3` Source: https://github.com/advisories/GHSA-5jgf-p345-68v8