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Fencer Vulns
critical 9.1

CVE-2026-73501 json

kin-openapi: ValidationHandler.Load() Fail-Open Authentication Bypass via NoopAuthenticationFunc Default

published 2026-07-24 3 mo ago modified 2026-10-24 15 d ago also GHSA-r277-6w6q-xmqw , GO-2026-6095 , EUVD-2026-57598

cvss
9.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 37%
public exploits
0
none known

Summary

kin-openapi is a Go project for handling OpenAPI files. Prior to 0.144.0, ValidationHandler.Load() in openapi3filter/validation_handler.go silently replaces a nil AuthenticationFunc with NoopAuthenticationFunc, which returns nil without checking credentials. This substitution causes every OpenAPI security requirement to be satisfied for unauthenticated requests when an application relies on ValidationHandler as its enforcement middleware. The no-op callback prevents the fail-closed ErrAuthenticationServiceMissing path from being reached and forwards the request to protected handlers that may require an API key, OAuth token, or another security scheme. This issue is fixed in version 0.144.0.

Patch / fix

  • go github.com/getkin/kin-openapi 0.144.0
  • grafana12.4 hummingbird 1 12.4.9-0.4.hum1
  • grafana13.1 hummingbird 1 13.1.3-0.2.hum1
  • grafana13.2 hummingbird 1 13.2.0-0.1.1.hum1
  • hugo hummingbird 1 0.165.0-0.1.hum1

red hat advisories RHSA-2026:60866RHSA-2026:59028RHSA-2026:59030RHSA-2026:54549

  • system-user-grafana SLE Module for Package Hub 15 SP7 1.0.0-150200.5.8.1
  • grafana SLE Module for Package Hub 15 SP7 12.4.10-150200.3.94.3
  • grafana Multi Linux Manager Tools SLE-15 12.4.10-150002.4.27.1
  • mgr-push Multi Linux Manager Tools SLE-15 5.2.5-150002.3.12.1
  • spacecmd Multi Linux Manager Tools SLE-15 5.2.10-150002.3.15.1
  • uyuni-tools Multi Linux Manager Tools SLE-Micro-5, Multi Linux Manager Tools SLE-15 5.2.17-150002.3.20.1
  • venv-salt-minion Multi Linux Manager Tools SLE-Micro-5, Multi Linux Manager Tools SLE-15 3006.0-150002.5.22.1
  • spacewalk-client-tools Multi Linux Manager Tools SLE-15 5.2.7-150002.3.12.1

suse advisories SUSE-SU-2026:4600-1SUSE-SU-2026:4585-1

  • grafana openSUSE Leap 16.0 12.4.10-bp160.1.1
  • grafana openSUSE Tumbleweed 12.4.10-1.1

opensuse advisories openSUSE-SU-2026:22125-1openSUSE-SU-2026:11684-1

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-2026-73501 updated cvss 9.1

github.com/getkin/kin-openapi: kin-openapi: kin-openapi: ValidationHandler.Load() Fail-Open Authentication Bypass via NoopAuthenticationFunc Default

  • Red Hat OpenShift Serverless kn-workflow-plugin, openshift-serverless-1/kn-backstage-plugins-eventmesh-rhel9
    affected: no fix available
  • Red Hat Ceph Storage 5 rhceph/rhceph-5-dashboard-rhel8 Red Hat Ceph Storage 6 rhceph/rhceph-6-dashboard-rhel9 Red Hat Ceph Storage 7 rhceph/grafana-rhel9 Red Hat Ceph Storage 8 rhceph/grafana-rhel9 Red Hat Ceph Storage 9 rhceph/grafana-rhel10
    affected: no fix available “Fix deferred”
  • Red Hat Edge Manager 1 flightctl Red Hat Enterprise Linux 8 osbuild-composer, osbuild-composer-core, osbuild-composer-worker, osbuild-composer-dnf-json, osbuild-composer 176-1.el10 Red Hat Enterprise Linux 9 grafana-pcp, osbuild-composer, osbuild-composer-core, osbuild-composer-worker, osbuild-composer-dnf-json, osbuild-composer 176-1.el10 Red Hat Enterprise Linux 10 grafana-pcp, osbuild-composer 176-1.el10 Red Hat OpenShift AI (RHOAI) rhoai/odh-core-bff-rhel9, rhoai/odh-mod-arch-gen-ai-rhel9, rhoai/odh-mod-arch-eval-hub-rhel9, rhoai/odh-mod-arch-agent-ops-rhel9 Red Hat OpenShift Container Platform 4 openshift, openshift-clients, openshift-kubelet, openshift-hyperkube, openshift-kube-apiserver, openshift-kube-scheduler, +4 more
    +2 more products
    Red Hat OpenShift Container Platform 5 openshift5/o-cloud-manager-rhel9-operator Red Hat Service Interconnect 2 skupper-cli, service-interconnect/skupper-cli-rhel9, service-interconnect/skupper-operator-bundle, service-interconnect/skupper-controller-rhel9, service-interconnect/skupper-kube-adaptor-rhel9, service-interconnect/skupper-network-observer-rhel9, +4 more
    affected: no fix available
  • Red Hat Multicluster Global Hub 1.7.4 multicluster-globalhub/multicluster-globalhub-grafana-rhel9 1793002792
    fixed: vendor fix RHSA-2026:95517
  • Red Hat Edge Manager 1.2 rhem/flightctl-ui-rhel9 1793718718, rhem/flightctl-api-rhel9 1793718545, rhem/flightctl-ui-rhel10 1793720014, rhem/flightctl-api-rhel10 1793719962, rhem/flightctl-ui-ocp-rhel9 1793719442, rhem/flightctl-worker-rhel9 1793718887, +22 more
    fixed: vendor fix RHSA-2026:94612
  • Red Hat Hardened Images hugo 0.165.0-0.1.hum1, grafana12.4 12.4.9-0.4.hum1, grafana13.1 13.1.3-0.2.hum1, grafana13.2 13.2.0-0.1.1.hum1
    fixed: vendor fix RHSA-2026:60866
  • Red Hat Migration Toolkit for Applications 8.2 mta/mta-cli-rhel9 1791460004
    fixed: vendor fix RHSA-2026:82315
  • Red Hat Migration Toolkit for Applications 8 mta/mta-hub-rhel9
    not affected: component not present
show 3 more
  • Red Hat Multicluster Engine for Kubernetes multicluster-engine/managedcluster-import-controller-rhel9 Red Hat Multicluster Global Hub 1.7.4 multicluster-globalhub/multicluster-globalhub-agent-rhel9 1792971214, multicluster-globalhub/multicluster-globalhub-manager-rhel9 1792971204, multicluster-globalhub/multicluster-globalhub-rhel9-operator 1793057598, multicluster-globalhub/multicluster-globalhub-operator-bundle 1793081711, multicluster-globalhub/multicluster-globalhub-postgres-exporter-rhel9 1793057536 Red Hat 3scale API Management Platform 2 3scale-amp2/3scale-operator-bundle, 3scale-amp2/3scale-rhel7-operator-metadata Red Hat Advanced Cluster Management for Kubernetes 2 flightctl, flightctl-agent, flightctl-selinux, rhacm2/acm-grafana-rhel9 Red Hat Enterprise Linux 8 grafana, grafana-pcp, grafana-loki, grafana-mssql, grafana-mysql, grafana-selinux, +10 more Red Hat Enterprise Linux 9 grafana, grafana-selinux, grafana 12.4.3-2.el10
    +4 more products
    Red Hat Enterprise Linux 10 grafana 12.4.3-2.el10, go-fdo-server 1.0.1-4.el10 Red Hat Hardened Images go-fdo-server 1.0.1-4.el10 Red Hat Migration Toolkit for Applications 8.2 mta/mta-ui-rhel9 1789882048, mta/mta-hub-rhel9 1791458244, mta/mta-rhel9-operator 1791456959, mta/mta-operator-bundle 1791461957, mta/mta-analyzer-addon-rhel9 1791458385, mta/mta-platform-addon-rhel9 1791457437, +7 more Red Hat OpenShift AI (RHOAI) rhoai/odh-kserve-agent-rhel9, rhoai/odh-kserve-router-rhel9, rhoai/odh-model-registry-rhel9, rhoai/odh-kserve-controller-rhel9, rhoai/odh-kserve-llmisvc-controller-rhel9, rhoai/odh-kserve-localmodelnode-agent-rhel9, +1 more
    not affected: vulnerable code not present
  • Red Hat OpenShift GitOps openshift-gitops-1/argocd-rhel8, openshift-gitops-1/argocd-rhel9
    not affected: component not present
  • Red Hat OpenStack Platform 18.0 rhoso-operators/openstack-operator-bundle
    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
Proof of concept is public
Automatable
yes
Technical impact
total
Assessed
2 mo ago

Exploit prediction

0.43% chance of exploitation in the next 30 days, higher than 37% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/getkin/kin-openapi/security/advisories/GHSA-r277-6w6q-xmqw referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
GitHub 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected packages

ecosystem package affected fixed in
go github.com/getkin/kin-openapi
<0.144.0
0.144.0

Affected products

  • getkin kin-openapi

Classification

Weakness

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.