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Fencer Vulns
medium 4.8

CVE-2026-86472 json

fast-uri vulnerable to inconsistent host case normalization via percent-encoded octets

published 2026-09-15 55 d ago modified 2026-09-30 40 d ago also EUVD-2026-78395 , GHSA-hrr3-gc8f-f4qj

cvss
4.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 16%
public exploits
0
none known

Summary

fast-uri is a dependency-free RFC 3986 URI parser for Node.js, used by Fastify and ajv. In versions before 2.4.7, from 3.0.0 through 3.1.7, and from 4.0.0 through 4.1.4, fast-uri folds the host to lowercase before it percent-decodes the host, so a percent-encoded uppercase octet such as %41 decodes to a literal A that is never folded. For a scheme-relative reference such as //host there is no scheme, so the host canonicalization that would normally repair this does not run, and parse, normalize, and equal then disagree on the same host. An application that makes a case-sensitive host decision on fast-uri output, for example a host allowlist or denylist that compares the parsed host or uses equal, can be steered past the check with a percent-encoded uppercase octet, and because hostnames are case-insensitive in DNS and HTTP the evading spelling still reaches the host the check meant to gate. The issue is fixed in fast-uri 2.4.7, 3.1.8, and 4.1.5, and users should upgrade to one of those versions or later. As a workaround, compare hosts case-insensitively by lowercasing the parsed host before any allowlist or denylist decision.

Patch / fix

  • npm fast-uri 2.4.7, 3.1.8, 4.1.5
  • fast-uri fast-uri 2.4.7, 3.1.8, 4.1.5
  • node-ajv Debian 14 8.20.0~ds+~cs7.1.6-1

debian advisories DEBIAN-CVE-2026-86472

  • grafana13.2 hummingbird 1 13.2.1-0.7.hum1
  • grafana13.1 hummingbird 1 13.1.6-0.3.hum1
  • grafana12.4 hummingbird 1 12.4.10-0.4.hum1

red hat advisories RHSA-2026:71906RHSA-2026:71040RHSA-2026:68143

  • agama-web-ui openSUSE Tumbleweed 25+475.275dd4727-56.1

opensuse advisories openSUSE-SU-2026:12424-1

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-2026-86472 updated cvss 4.8

fast-uri: fast-uri: Security bypass due to inconsistent host case normalization

  • Red Hat Cost Management On Premise costmanagement/costmanagement-ui-rhel10 Red Hat Cryostat 4 cryostat/cryostat-openshift-console-plugin-rhel9 Red Hat Migration Toolkit for Applications 8 mta/mta-solution-server-rhel9 Red Hat Migration Toolkit for Containers rhmtc/openshift-migration-ui-rhel8 Red Hat Multicluster Engine for Kubernetes multicluster-engine/console-mce-rhel9 Red Hat Network Observability Operator network-observability/network-observability-console-plugin-rhel9, network-observability/network-observability-console-plugin-pf5-rhel9
    +5 more products
    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-rhel9, openshift-pipelines/pipelines-console-plugin-pf5-rhel9 Red Hat OpenShift Serverless openshift-serverless-1/kn-eventing-integrations-log-sink-rhel9, openshift-serverless-1/kn-eventing-integrations-aws-s3-sink-rhel9, openshift-serverless-1/kn-eventing-integrations-aws-sns-sink-rhel9, openshift-serverless-1/kn-eventing-integrations-aws-sqs-sink-rhel9, openshift-serverless-1/kn-eventing-integrations-timer-source-rhel9, openshift-serverless-1/kn-eventing-integrations-aws-s3-source-rhel9, +3 more Red Hat Advanced Cluster Management for Kubernetes 2 rhacm2/console-rhel9 Red Hat AMQ Broker 7 amq-broker-bin.zip 7.14.1.CR3, amq-broker-maven-repository.zip 7.14.1.CR3
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Ansible Automation Platform 2 automation-platform-ui 2.6.13-1.el9ap, automation-gateway 2.5.20260824-1.el8ap, ansible-automation-platform-24/lightspeed-rhel8, ansible-automation-platform-25/lightspeed-rhel8, ansible-automation-platform-26/lightspeed-rhel9, ansible-automation-platform-27/mcp-server-rhel9, +1 more
    affected: workaround, no fix available, no fix planned “Out of support scope”
  • Red Hat build of Apache Camel - HawtIO 4 rhaf-hawtio-maven-repository.zip 4.4.0.GA
    affected: workaround, no fix available “Fix deferred”
  • Red Hat build of Apicurio Registry 3 apicurio/apicurio-registry-ui-rhel8
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Build of Podman Desktop rh-podman-desktop.git 1.1.0 Red Hat Data Grid 8 redhat-datagrid-maven-repository.zip 8.6.1.CR1 Red Hat Developer Hub 1 rhdh/rhdh-hub-rhel9, rhdh/red-hat-developer-hub-backstage-plugin-orchestrator, rhdh/red-hat-developer-hub-backstage-plugin-lightspeed-backend, rhdh/red-hat-developer-hub-backstage-plugin-orchestrator-backend, rhdh/red-hat-developer-hub-backstage-plugin-orchestrator-form-widgets, rhdh/red-hat-developer-hub-backstage-plugin-orchestrator-backend-module-loki, +1 more
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Directory Server 11 389-ds-base 1.4.3.34-9.module+el8dsrv+24847+c94540a6 Red Hat Directory Server 12 389-ds-base 2.2.7-18.module+el9dsrv+24814+6d9b6eb5 Red Hat Edge Manager 1 rhem/flightctl-ui-rhel9, rhem/flightctl-ui-rhel10, rhem/flightctl-ui-ocp-rhel9, rhem/flightctl-ui-ocp-rhel10
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 8 dotnet, dotnet-host, dotnet-sdk-8.0, dotnet-hostfxr-8.0, dotnet-runtime-8.0, dotnet-sdk-dbg-8.0, +10 more Red Hat Enterprise Linux 9 sgx-mpa, tdx-qgs, sgx-libs, sgx-pccs, sgx-common, dotnet-host, +17 more Red Hat Enterprise Linux 10 grafana 12.4.3-2.el10, linux-sgx 2.26-7.el10, dotnet8.0 8.0.130-2.el10, grafana-pcp 6.1.0-1.el10, cockpit-image-builder 110-1.el10 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 Red Hat OpenShift AI (RHOAI) rhoai/odh-mlflow-rhel9, rhoai/odh-core-bff-rhel9, rhoai/odh-dashboard-rhel9, rhoai/odh-mod-arch-maas-rhel9, rhoai/odh-feature-server-rhel9, rhoai/odh-mod-arch-automl-rhel9, +8 more Red Hat OpenShift Container Platform 4 openshift4/ose-console-rhel9, openshift4/ose-monitoring-plugin-rhel9, openshift4/nmstate-console-plugin-rhel9
    +1 more products
    Red Hat OpenShift Container Platform 5 openshift5/ose-console-rhel9, openshift5/ose-monitoring-plugin-rhel9, openshift5/nmstate-console-plugin-rhel9
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Openshift Data Foundation 4 odf4/mcg-core-rhel9, odf4/odf-console-rhel9, odf4/ocs-client-console-rhel9, odf4/odf-multicluster-console-rhel9
    affected: workaround, no fix available, no fix planned “Out of support scope”
show 9 more
  • Red Hat OpenShift Dev Spaces devspaces/code-rhel9, devspaces/openvsx-rhel9, devspaces/dashboard-rhel9, devspaces/pluginregistry-rhel9
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Quay 3 quay/quay-rhel8, quay/quay-rhel9
    affected: workaround, no fix available, no fix planned “Out of support scope”
  • Red Hat Satellite 6 nodejs-webpack 5.109.2-1.el9sat, satellite/iop-remediations-rhel9, satellite/iop-vulnerability-frontend-rhel9, nodejs-mini-css-extract-plugin 2.10.2-2.el9sat, nodejs-compression-webpack-plugin 10.0.0-3.el9sat
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Secrets Management Console for Red Hat OpenShift external-secrets-management/console-plugin-rhel9
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Self-service automation portal 2 ansible-automation-platform/automation-portal, ansible-automation-platform/bootc-automation-portal-rhel9
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Hardened Images grafana13.1 13.1.6-0.3.hum1, grafana13.2 13.2.1-0.7.hum1, grafana12.4 12.4.10-0.4.hum1
    fixed: vendor fix RHSA-2026:68143
  • Red Hat Build of Podman Desktop rh-podman-desktop 3c6fc75a2a6cf5bb9b8a667fddcbbf428132badc Red Hat Discovery 2 discovery/discovery-ui-rhel9
    not affected: vulnerable code not present
  • Red Hat Hardened Images jaeger 2.20.0-0.8.hum1, dotnet8.0 8.0.130-2.el10, prometheus3.13 3.13.3-0.1.hum1
    not affected: component not present
  • Red Hat Satellite 6 satellite/iop-advisor-frontend-rhel9, satellite/iop-host-inventory-frontend-rhel9
    not affected: vulnerable code not present

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
no
Technical impact
partial
Assessed
55 d ago

Exploit prediction

0.25% chance of exploitation in the next 30 days, higher than 16% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 4.8 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
GitHub 3.1 4.8 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

Affected packages

ecosystem package affected fixed in
npm fast-uri
<2.4.7
>=3.0.0, <3.1.8
>=4.0.0, <4.1.5
2.4.7
3.1.8
4.1.5

Affected products

  • fast-uri fast-uri

Classification

Weakness
  • CWE-178 Improper Handling of Case Sensitivity

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.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.