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Fencer Vulns
medium 4.8

CVE-2026-114437 json

Chi Client IP Spoofing in ClientIPFromXFF via X-Forwarded-For

published 2026-10-21 18 d ago modified 2026-10-23 16 d ago also GHSA-j6qf-3m9c-vwj3 , EUVD-2026-107261

cvss
4.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 2%
public exploits
0
none known

Summary

In the Golang Chi web framework, the ClientIPFromXFF middleware skips any X-Forwarded-For entry in a configured trusted CIDR but never verifies that the direct TCP peer in http.Request.RemoteAddr belongs to that CIDR. A client that can reach the Go server directly can therefore append a trusted-looking proxy address and choose the client IP returned by middleware.GetClientIP.

This issue affects chi before 5.4.0.

Patch / fix

  • go github.com/go-chi/chi/v5 5.4.0
  • go-chi chi 5.4.0
  • hauler openSUSE Leap 16.0 2.1.2-bp160.1.1
  • hauler openSUSE Tumbleweed 2.1.2-2.1

opensuse advisories openSUSE-SU-2026:22201-1openSUSE-SU-2026:12290-1

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-2026-114437 updated cvss 4.8

github.com/go-chi/chi: chi: client IP spoofing via unverified direct connection in ClientIPFromXFF middleware

  • Red Hat Logging Subsystem for Red Hat OpenShift openshift-logging/opa-openshift-rhel9
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Multicluster Engine for Kubernetes multicluster-engine/managedcluster-import-controller-rhel9 Red Hat OpenShift Pipelines openshift-pipelines-client 1.15.3-11580.el8 Red Hat OpenShift Serverless openshift-serverless-1/kn-plugin-event-sender-rhel9 Red Hat Advanced Cluster Management for Kubernetes 2 rhacm2/observatorium-rhel9 Red Hat Enterprise Linux 8 osbuild-composer, osbuild-composer-core, osbuild-composer-worker, osbuild-composer-dnf-json Red Hat OpenShift Container Platform 4 cri-o, openshift4/ose-telemeter, openshift4/ose-telemeter-rhel9, openshift4/oc-mirror-plugin-rhel9
    +3 more products
    Red Hat OpenShift Container Platform 5 openshift5/ose-telemeter-rhel9 Red Hat OpenShift Dev Spaces devspaces/udi-rhel9 Red Hat OpenShift distributed tracing 3 rhosdt/tempo-gateway-opa-rhel9
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Quay 3 quay/quay-rhel8, quay/quay-rhel9
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Satellite 6 satellite/iop-ingress-rhel9 Red Hat Trusted Artifact Signer rhtas/cosign-rhel9
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Web Terminal web-terminal/web-terminal-tooling-rhel9 Red Hat Zero Trust Workload Identity Manager - Tech Preview zero-trust-workload-identity-manager/spiffe-spire-agent-rhel9, zero-trust-workload-identity-manager/spiffe-spire-server-rhel9, zero-trust-workload-identity-manager/spiffe-spire-oidc-discovery-provider-rhel9, zero-trust-workload-identity-manager/zero-trust-workload-identity-manager-rhel9, zero-trust-workload-identity-manager/zero-trust-workload-identity-manager-operator-bundle
    affected: workaround, no fix planned “Out of support scope”

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
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
18 d ago

Exploit prediction

0.13% chance of exploitation in the next 30 days, higher than 2% 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
CNA 4.0 6.3 CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
CNA 4.0 6.3 CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
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
go github.com/go-chi/chi/v5
<5.4.0
5.4.0

Affected products

  • go-chi chi

Classification

Weakness
  • CWE-348 Use of Less Trusted Source
  • CWE-345 Insufficient Verification of Data Authenticity

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.