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CVE-2026-13676: fast-uri vulnerable to host confusion via failed IDN canonicalization

High · CVSS 7.5 (CVSS 3.1)EPSS 0.69%, 53th percentilePublished Updated Assigner: openjs

Description

fast-uri versions 2.3.1 through 3.1.2 and 4.0.0 fail to canonicalize Unicode (IDN) hostnames for HTTP-family URLs. The IDN conversion path calls a helper that does not exist on the global URL constructor, silently leaving the host in its original Unicode form while normalize() and equal() still return values that differ from a WHATWG-compatible URL parser. Applications that use fast-uri to enforce host-based policy (denylists, loopback filtering, redirect validation, outbound proxy routing) before passing the same URL to Node's URL or fetch can be bypassed when the two implementations resolve the same input to different hosts. Patches: upgrade to fast-uri 3.1.3 for the 3.x line or 4.0.1 for the 4.x line. Workarounds: enforce host policy using the same URL parser used for the actual request, or reject non-ASCII hosts before policy checks.

Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N · CWE-436

Tracked companies

BitbucketConfluenceJira

Mapped from the CVE’s affected-product data, NVD CPE matches, vendor advisories or package feeds. A mapping means the vendor’s software is named, not that its hosted service was exposed.

Status incidents that name it

No tracked status incident names this CVE.

Affected vendors and products

fast-uri: fast-uriRed Hat: Confidential Compute AttestationRed Hat: Cryostat 4Red Hat: Network Observability OperatorRed Hat: OpenShift LightspeedRed Hat: OpenShift PipelinesRed Hat: OpenShift ServerlessRed Hat: Red Hat Advanced Cluster Management for Kubernetes 2.16Red Hat: Red Hat Advanced Cluster Management for Kubernetes 2.17Red Hat: Red Hat AMQ Broker 7.13.6Red Hat: Red Hat AMQ Broker 7.14.1Red Hat: Red Hat Ansible Automation Platform 2Red Hat: Red Hat Ansible Automation Platform 2.6Red Hat: Red Hat Ansible Automation Platform 2.7Red Hat: Red Hat build of Apache Camel - HawtIO 4Red Hat: Red Hat build of Apicurio Registry 3Red Hat: Red Hat Build of Podman DesktopRed Hat: Red Hat Connectivity Link 1Red Hat: Red Hat Data Grid 8Red Hat: Red Hat Enterprise Linux 10Red Hat: Red Hat Enterprise Linux 9Red Hat: Red Hat Enterprise Linux AI (RHEL AI) 3Red Hat: Red Hat OpenShift AI (RHOAI)Red Hat: Red Hat OpenShift Container Platform 4Red Hat: Red Hat OpenShift Virtualization 4Red Hat: Red Hat Satellite 6Red Hat: Self-service automation portal 2

References

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