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Fencer Vulns
high 7.5

CVE-2026-13676 json

fast-uri vulnerable to host confusion via failed IDN canonicalization

published 2026-06-29 4 mo ago modified 2026-09-11 59 d ago also GHSA-4c8g-83qw-93j6 , EUVD-2026-40093

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 53%
public exploits
0
none known

Summary

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.

Patch / fix

  • npm fast-uri 2.4.2, 3.1.3, 4.0.1
  • fast-uri fast-uri 3.1.3, 4.0.1
  • Red Hat Red Hat Enterprise Linux 10 0:1.1.2-1.el10_2
  • Red Hat Cluster Observability Operator 1.5.0 1787593647, 1787597578, 1787597621
  • Red Hat multicluster engine for Kubernetes 2.11 1786911977
  • Red Hat multicluster engine for Kubernetes 2.17 1786668856
  • Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.16 1786908361
  • Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.17 1787335105
  • Red Hat Red Hat Ansible Automation Platform 2.2 1784622951
  • Red Hat Red Hat Ansible Automation Platform 2.6 1785773509
  • Red Hat Red Hat Ansible Automation Platform 2.7 1785413994
  • Red Hat Red Hat Developer Hub 1.10 1785332487, 1785332668, 1785332694, 1785332825, 1785340831, 1785411652
  • Red Hat Red Hat Developer Hub 1.9 1784210921
  • Red Hat Red Hat Discovery 2 1786634825
  • Red Hat Red Hat Edge Manager 1.1 1784126822, 1784127736, 1784194574, 1784194938
  • Red Hat Red Hat Migration Toolkit 1.8 1783690532
  • Red Hat Red Hat Migration Toolkit for Applications 8.2 1784109883
  • Red Hat Red Hat OpenShift AI 3.4 1786611759, 1787121387, 1787250508, 1787250617, 1787251250, 1787251550, 1787347991
  • Red Hat Red Hat OpenShift Container Platform 4.16 1785530656
  • Red Hat Red Hat OpenShift Container Platform 4.17 1784744859
  • Red Hat Red Hat OpenShift Container Platform 4.19 1784144829
  • Red Hat Red Hat OpenShift Container Platform 4.20 1783596795
  • Red Hat Red Hat OpenShift Container Platform 4.21 1783510956, 1784728481
  • Red Hat Red Hat OpenShift Container Platform 4.22 1783559447, 1784729919
  • Red Hat Red Hat Openshift Data Foundation 4.18 1786705347, 1786705558, 1786705646, 1786705741, 1786705777, 1786705802, 1786705938, 1786706101, 1786706125, 1786706138, 1786706177, 1786706188, 1786706357, 1786706577, 1786706612, 1786706644, 1786706659, 1786706679, 1786706880
  • Red Hat Red Hat Openshift Data Foundation 4.19 1786701555, 1786701839, 1786702052, 1786702264, 1786702276, 1786702315, 1786702440, 1786702448, 1786702559, 1786702563, 1786702623, 1786702636, 1786702713, 1786702716, 1786702872, 1786702917, 1786702949, 1786703071, 1786703137, 1786703143
  • Red Hat Red Hat Openshift Data Foundation 4.20 1786626399, 1786627106, 1786627382, 1786627430, 1786627460, 1786627469, 1786627559, 1786628053, 1786628142, 1786628235, 1786628340, 1786628623, 1786629076, 1786629478, 1786629761, 1786631508, 1786632256, 1786644072, 1786687918, 1786688215
  • Red Hat Red Hat OpenShift Dev Spaces 3.29 1784737150
  • Red Hat Red Hat Quay 3.16 1783955846
  • Red Hat Red Hat Quay 3.9 1784125838
  • node-ajv Debian 14 8.20.0~ds+~cs7.1.2-1

debian advisories DEBIAN-CVE-2026-13676

  • rh-podman-desktop RHEL 10.2 1.1.2-1.el10_2

red hat advisories RHSA-2026:57590

  • agama-web-ui openSUSE Tumbleweed 24+0.a836cced5-52.1
  • agama-web-ui openSUSE Leap 16.0 17+673.b97ba64d6-160000.12.1
  • python-pydata-sphinx-theme openSUSE Leap 16.0 0.16.1-bp160.3.1
  • python-pydata-sphinx-theme openSUSE Tumbleweed 0.19.0-2.1

opensuse advisories openSUSE-SU-2026:11680-1openSUSE-SU-2026:21448-1openSUSE-SU-2026:21231-1openSUSE-SU-2026:11160-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-13676 updated cvss 7.5

fast-uri: fast-uri: Security policy bypass due to improper Unicode hostname canonicalization

  • Red Hat Confidential Compute Attestation openshift-sandboxed-containers/osc-pccs
    affected: workaround, no fix planned “Will not fix”
  • Red Hat Network Observability Operator network-observability/network-observability-console-plugin-rhel9, network-observability/network-observability-console-plugin-pf5-rhel9 Red Hat OpenShift Lightspeed openshift-lightspeed/lightspeed-console-plugin-rhel9, openshift-lightspeed/lightspeed-agentic-console-rhel9, openshift-lightspeed/lightspeed-console-plugin-419-rhel9, openshift-lightspeed/lightspeed-console-plugin-pf5-rhel9 Red Hat OpenShift Pipelines openshift-pipelines/pipelines-hub-ui-rhel8, openshift-pipelines/pipelines-hub-ui-rhel9, openshift-pipelines/pipelines-console-plugin-rhel8, openshift-pipelines/pipelines-console-plugin-rhel9, openshift-pipelines/pipelines-console-plugin-pf5-rhel9 Red Hat OpenShift Serverless openshift-serverless-1/kn-eventing-integrations-transform-jsonata-rhel9
    affected: workaround, no fix available
  • Red Hat Ansible Automation Platform 2 ansible-automation-platform-24/lightspeed-rhel8, ansible-automation-platform-25/lightspeed-rhel8, ansible-automation-platform-26/lightspeed-rhel9, ansible-automation-platform-27/lightspeed-rhel9
    affected: workaround, no fix planned “Will not fix”
  • Red Hat build of Apache Camel - HawtIO 4 fast-uri Red Hat build of Apicurio Registry 3 apicurio/apicurio-registry-ui-rhel8, apicurio/apicurio-registry-ui-rhel9 Red Hat Build of Podman Desktop rh-podman-desktop.git Red Hat Connectivity Link 1 rhcl-1/rhcl-console-plugin-rhel9
    affected: workaround, no fix available
  • Red Hat Data Grid 8 fast-uri
    affected: workaround, no fix planned “Will not fix”
  • Red Hat Enterprise Linux 9 sgx-mpa, tdx-qgs, sgx-libs, sgx-pccs, linux-sgx, sgx-common, +2 more
    affected: workaround, no fix available
  • Red Hat Enterprise Linux AI (RHEL AI) 3 rhelai3/bootc-cuda-rhel9, rhelai3/bootc-rocm-rhel9, rhelai3/bootc-gaudi-rhel9, rhelai3/disk-image-cuda-rhel9
    affected: workaround, no fix available, no fix planned “Will not fix”
  • Red Hat OpenShift Container Platform 4 openshift4/ose-agent-installer-ui-rhel9 Red Hat OpenShift Container Platform 5 openshift5/ose-monitoring-plugin-rhel9, openshift5/nmstate-console-plugin-rhel9 Red Hat Self-service automation portal 2 ansible-automation-platform/bootc-automation-portal-rhel9
    affected: workaround, no fix available
show 24 more
  • Red Hat Cluster Observability Operator 1.5 cluster-observability-operator/monitoring-console-plugin-rhel9 1787597621, cluster-observability-operator/monitoring-console-plugin-pf5-rhel9 1787593647, cluster-observability-operator/monitoring-console-plugin-pf6-rhel9 1787597578
    fixed: vendor fix RHSA-2026:61314
  • Red Hat multicluster engine for Kubernetes 2.11 multicluster-engine/console-mce-rhel9 1786911977
    fixed: vendor fix RHSA-2026:57194
  • Red Hat multicluster engine for Kubernetes 2.17 multicluster-engine/console-mce-rhel9 1786668856
    fixed: vendor fix RHSA-2026:59593
  • Red Hat Advanced Cluster Management for Kubernetes 2.16 rhacm2/console-rhel9 1786908361
    fixed: vendor fix RHSA-2026:57191
  • Red Hat Advanced Cluster Management for Kubernetes 2.17 rhacm2/console-rhel9 1787335105
    fixed: vendor fix RHSA-2026:60386
  • Red Hat AMQ Broker 7.13.6
    fixed: vendor fix RHSA-2026:66545
  • Red Hat AMQ Broker 7.14.1
    fixed: vendor fix RHSA-2026:66488
  • Red Hat Ansible Automation Platform 2.2 ansible-automation-platform/automation-portal 1784622951
    fixed: vendor fix RHSA-2026:42815
  • Red Hat Ansible Automation Platform 2.6 ansible-automation-platform-tech-preview/mcp-server-rhel9 1785773509
    fixed: vendor fix RHSA-2026:50479
  • Red Hat Ansible Automation Platform 2.7 ansible-automation-platform-27/mcp-server-rhel9 1785413994
    fixed: vendor fix RHSA-2026:50340
  • Red Hat Developer Hub 1.9 rhdh/rhdh-hub-rhel9 1784210921
    fixed: vendor fix RHSA-2026:41929
  • Red Hat Developer Hub 1.10 rhdh/rhdh-hub-rhel9 1785411652, rhdh/red-hat-developer-hub-backstage-plugin-orchestrator 1785340831, rhdh/red-hat-developer-hub-backstage-plugin-lightspeed-backend 1785332487, rhdh/red-hat-developer-hub-backstage-plugin-orchestrator-backend 1785332825, rhdh/red-hat-developer-hub-backstage-plugin-orchestrator-backend-module-loki 1785332668, rhdh/red-hat-developer-hub-backstage-plugin-scaffolder-backend-module-orchestrator 1785332694
    fixed: vendor fix RHSA-2026:48126
  • Red Hat Discovery 2 discovery/discovery-ui-rhel9 1786634825
    fixed: vendor fix RHSA-2026:54760
  • Red Hat Edge Manager 1.1 rhem/flightctl-ui-rhel9 1784127736, rhem/flightctl-ui-rhel10 1784194574, rhem/flightctl-ui-ocp-rhel9 1784126822, rhem/flightctl-ui-ocp-rhel10 1784194938
    fixed: vendor fix RHSA-2026:40945
  • Red Hat Edge Manager 1.2 rhem/flightctl-ui-rhel9 1789486750, rhem/flightctl-ui-rhel10 1789488111, rhem/flightctl-ui-ocp-rhel9 1789486476, rhem/flightctl-ui-ocp-rhel10 1789485920
    fixed: vendor fix RHSA-2026:68006
  • Red Hat Enterprise Linux Extensions Channel (v. 10) rh-podman-desktop 1.1.2-1.el10_2
    fixed: vendor fix RHSA-2026:57590
  • Red Hat Migration Toolkit 1.8 rhmtc/openshift-migration-ui-rhel8 1783690532
    fixed: vendor fix RHSA-2026:41928
  • Red Hat Migration Toolkit for Applications 8.2 mta/mta-solution-server-rhel9 1784109883
    fixed: vendor fix RHSA-2026:43038
  • Red Hat OpenShift AI 3.4 rhoai/odh-dashboard-rhel9 1787347991, rhoai/odh-mod-arch-maas-rhel9 1787251250, rhoai/odh-mod-arch-automl-rhel9 1787250508, rhoai/odh-mod-arch-gen-ai-rhel9 1786611759, rhoai/odh-mod-arch-autorag-rhel9 1787251550, rhoai/odh-mod-arch-eval-hub-rhel9 1791861214, +2 more
    fixed: vendor fix RHSA-2026:60520
  • Red Hat OpenShift Container Platform 4.16 openshift4/ose-monitoring-plugin-rhel9 1785530656
    fixed: vendor fix RHSA-2026:50758
  • Red Hat OpenShift Container Platform 4.17 openshift4/ose-monitoring-plugin-rhel9 1784744859
    fixed: vendor fix RHSA-2026:47728
  • Red Hat OpenShift Container Platform 4.19 openshift4/ose-monitoring-plugin-rhel9 1784144829
    fixed: vendor fix RHSA-2026:40765
  • Red Hat OpenShift Container Platform 4.20 openshift4/ose-monitoring-plugin-rhel9 1783596795
    fixed: vendor fix RHSA-2026:37628
  • Red Hat OpenShift Container Platform 4.21 openshift4/ose-monitoring-plugin-rhel9 1783510956, openshift4/nmstate-console-plugin-rhel9 1784728481
    fixed: vendor fix RHSA-2026:44268

11 more fixed, 37 more not affected in the full advisory

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
4 mo ago

Exploit prediction

0.69% chance of exploitation in the next 30 days, higher than 53% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected packages

ecosystem package affected fixed in
npm fast-uri
>=4.0.0, <4.0.1
>=3.0.0, <3.1.3
>=2.3.1, <2.4.2
4.0.1
3.1.3
2.4.2

Affected products

  • fast-uri fast-uri
  • Red Hat Red Hat AMQ Broker 7.13.6
  • Red Hat Red Hat AMQ Broker 7.14.1
  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Cluster Observability Operator 1.5.0
  • Red Hat multicluster engine for Kubernetes 2.11
  • Red Hat multicluster engine for Kubernetes 2.17
  • Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.16
  • Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.17
  • Red Hat Red Hat Ansible Automation Platform 2.2
  • Red Hat Red Hat Ansible Automation Platform 2.6
  • Red Hat Red Hat Ansible Automation Platform 2.7
  • Red Hat Red Hat Developer Hub 1.10
  • Red Hat Red Hat Developer Hub 1.9
  • Red Hat Red Hat Discovery 2
  • Red Hat Red Hat Edge Manager 1.1
  • Red Hat Red Hat Migration Toolkit 1.8
  • Red Hat Red Hat Migration Toolkit for Applications 8.2
  • Red Hat Red Hat OpenShift AI 3.4
  • Red Hat Red Hat OpenShift Container Platform 4.16
  • Red Hat Red Hat OpenShift Container Platform 4.17
  • Red Hat Red Hat OpenShift Container Platform 4.19
  • Red Hat Red Hat OpenShift Container Platform 4.20
  • Red Hat Red Hat OpenShift Container Platform 4.21
  • Red Hat Red Hat OpenShift Container Platform 4.22
  • Red Hat Red Hat Openshift Data Foundation 4.18
  • Red Hat Red Hat Openshift Data Foundation 4.19
  • Red Hat Red Hat Openshift Data Foundation 4.20
  • Red Hat Red Hat OpenShift Dev Spaces 3.29
  • Red Hat Red Hat Quay 3.16
  • Red Hat Red Hat Quay 3.9
  • Red Hat Red Hat Satellite 6.18
  • Red Hat Red Hat Satellite 6.19
  • Red Hat Confidential Compute Attestation
  • Red Hat Cryostat 4
  • Red Hat Network Observability Operator
  • Red Hat OpenShift Lightspeed
  • Red Hat OpenShift Pipelines
  • Red Hat OpenShift Serverless
  • Red Hat Red Hat Ansible Automation Platform 2
  • Red Hat Red Hat build of Apache Camel - HawtIO 4
  • Red Hat Red Hat build of Apicurio Registry 3
  • Red Hat Red Hat Build of Podman Desktop
  • Red Hat Red Hat Connectivity Link 1
  • Red Hat Red Hat Data Grid 8
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat Enterprise Linux AI (RHEL AI) 3
  • Red Hat Red Hat OpenShift AI (RHOAI)
  • Red Hat Red Hat OpenShift Container Platform 4
  • Red Hat Red Hat OpenShift Virtualization 4

Classification

Weakness
  • CWE-436 Interpretation Conflict
  • CWE-551 Incorrect Behavior Order: Authorization Before Parsing and Canonicalization

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.