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Fencer Vulns
high 7.5

CVE-2026-76905 json

kin-openapi openai3filter: nil-pointer panic in ConvertErrors on malformed multipart/form-data body enables unauthenticated DoS

published 2026-08-21 2 mo ago modified 2026-10-12 28 d ago also GHSA-mmfr-pmjx-hw9w , GO-2026-6274 , EUVD-2026-64150

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 49%
public exploits
0
none known

Summary

kin-openapi is a Go project for handling OpenAPI files. From 0.10.0 until 0.141.0, openapi3filter.convertParseError in openapi3filter/validation_error_encoder.go dereferences e.Parameter.In without checking whether e.Parameter is nil. A malformed non-string scalar field in a multipart/form-data request body produces a nested ParseError with a nil RequestError.Parameter, and applications that render the validation error through openapi3filter.ConvertErrors or ValidationErrorEncoder panic. An unauthenticated client can repeatedly send such requests to deny service when the application lacks a recovery boundary. JSON request bodies and applications that do not use these error-rendering helpers are not affected. This issue is fixed in version 0.141.0.

Patch / fix

  • go github.com/getkin/kin-openapi 0.141.0
  • govulncheck-vulndb SLES for SAP applications 16.0, SLES 16.0 0.0.20260827T195228-160000.1.1

suse advisories SUSE-SU-2026:23625-1

  • govulncheck-vulndb openSUSE Leap 16.0 0.0.20260827T195228-160000.1.1

opensuse advisories openSUSE-SU-2026:21761-1

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-2026-76905 updated cvss 5.3

github.com/getkin/kin-openapi: kin-openapi: Denial of Service via malformed multipart/form-data body

  • Red Hat OpenShift Serverless openshift-serverless-1/kn-backstage-plugins-eventmesh-rhel9
    affected: no fix available
  • Red Hat Advanced Cluster Management for Kubernetes 2 flightctl-agent, flightctl-selinux, flightctl 0.10.0-1.el9em 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 rhem/flightctl-ui-rhel9, rhem/flightctl-api-rhel9, rhem/flightctl-ui-rhel10, rhem/flightctl-api-rhel10, rhem/flightctl-ui-ocp-rhel9, rhem/flightctl-worker-rhel9, +22 more
    affected: no fix available
  • Red Hat Enterprise Linux 9 rhel9/grafana Red Hat Enterprise Linux 10 rhel10/grafana
    affected: no fix available “Fix deferred”
  • Red Hat OpenShift AI (RHOAI) rhoai/odh-core-bff-rhel9, rhoai/odh-mod-arch-agent-ops-rhel9 Red Hat OpenShift Container Platform 4 openshift4/o-cloud-manager-rhel9-operator, openshift4/o-cloud-manager-operator-bundle Red Hat OpenShift Container Platform 5 openshift5/o-cloud-manager-rhel9-operator
    affected: no fix available
  • Red Hat OpenShift GitOps openshift-gitops-1/argocd-rhel8, openshift-gitops-1/argocd-rhel9
    affected: no fix planned “Will not fix”
  • Red Hat OpenStack Platform 18.0 rhoso-operators/openstack-operator-bundle Red Hat Service Interconnect 2 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, service-interconnect/network-observer-operator-rhel9, +3 more
    affected: no fix available “Fix deferred”
  • Red Hat Multicluster Global Hub 1.7.4 multicluster-globalhub/multicluster-globalhub-grafana-rhel9 1793002792
    fixed: vendor fix RHSA-2026:95517
show 10 more
  • Red Hat Migration Toolkit for Applications 8.2 mta/mta-cli-rhel9 1791460004
    fixed: vendor fix RHSA-2026:82315
  • Red Hat OpenShift AI 2.25 rhoai/odh-kserve-agent-rhel9 1790871143, rhoai/odh-kserve-router-rhel9 1790871135, rhoai/odh-kserve-controller-rhel9 1790871131
    fixed: vendor fix RHSA-2026:87410
  • Red Hat OpenShift AI 3.4 rhoai/odh-kserve-agent-rhel9 1791468381, rhoai/odh-kserve-router-rhel9 1791468401, rhoai/odh-mod-arch-gen-ai-rhel9 1791861479, rhoai/odh-kserve-controller-rhel9 1791468368, rhoai/odh-mod-arch-eval-hub-rhel9 1791861214, rhoai/odh-kserve-llmisvc-controller-rhel9 1791468484
    fixed: vendor fix RHSA-2026:84734
  • Red Hat OpenShift AI 3.5 rhoai/odh-kserve-agent-rhel9 1791949308, rhoai/odh-kserve-router-rhel9 1791919359, rhoai/odh-kserve-controller-rhel9 1791951164, rhoai/odh-kserve-llmisvc-controller-rhel9 1791948422, rhoai/odh-kserve-localmodelnode-agent-rhel9 1791949630, rhoai/odh-kserve-localmodel-controller-rhel9 1791949759
    fixed: vendor fix RHSA-2026:86891
  • Red Hat Migration Toolkit for Applications 8 mta/mta-hub-rhel9 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 OpenShift Serverless kn-workflow-plugin 1.38.0-3.el9
    not affected: vulnerable code not present
  • Red Hat 3scale API Management Platform 2 3scale-amp2/3scale-operator-bundle, 3scale-amp2/3scale-rhel7-operator-metadata
    not affected: component not present
  • Red Hat Advanced Cluster Management for Kubernetes 2 rhacm2/acm-grafana-rhel9
    not affected: vulnerable code not in execute path
  • Red Hat Edge Manager 1 flightctl 0.10.0-1.el9em Red Hat Enterprise Linux 8 grafana, grafana-pcp, grafana-loki, grafana-mssql, grafana-mysql, grafana-selinux, +16 more Red Hat Enterprise Linux 9 grafana, grafana-pcp, grafana-selinux, osbuild-composer, grafana 12.4.3-2.el10, osbuild-composer-core, +4 more Red Hat Enterprise Linux 10 grafana 12.4.3-2.el10, go-fdo-server 1.0.1-4.el10, grafana-pcp 5.3.0-7.el10_2, osbuild-composer 134.1-9.el10_0 Red Hat Hardened Images hugo 0.165.0-0.1.hum1, go-fdo-server 1.0.1-4.el10, grafana12.4 12.4.9-0.2.hum1, grafana13.1 13.1.3-0.2.hum1, grafana13.2 13.2.0-0.1.1.hum1 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
    not affected: vulnerable code not present
  • Red Hat OpenShift AI (RHOAI) rhoai/odh-model-registry-rhel9
    not affected: component not present
  • Red Hat OpenShift AI 2.25 rhoai/odh-rhel9-operator 1792570619, rhoai/odh-vllm-cpu-rhel9 1792018436, rhoai/odh-dashboard-rhel9 1791853525, rhoai/odh-modelmesh-rhel9 1790881700, rhoai/odh-operator-bundle 1792571069, rhoai/odh-vllm-cuda-rhel9 1791358976, +63 more Red Hat OpenShift AI 3.4 rhoai/odh-cli-rhel9 1791509689, rhoai/rhai-cli-rhel9 1791509689, rhoai/odh-automl-rhel9 1791535789, rhoai/odh-mlflow-rhel9 1791865967, rhoai/odh-autorag-rhel9 1791557539, rhoai/odh-trainer-rhel9 1791869783, +94 more Red Hat OpenShift AI 3.5 rhoai/odh-cli-rhel9 1791945905, rhoai/rhai-cli-rhel9 1791945905, rhoai/odh-automl-rhel9 1791916705, rhoai/odh-mlflow-rhel9 1791947857, rhoai/odh-autorag-rhel9 1791903266, rhoai/odh-trainer-rhel9 1791952138, +107 more Red Hat OpenShift Container Platform 4 openshift, openshift-clients, openshift-kubelet, openshift-hyperkube, openshift-kube-apiserver, openshift-kube-scheduler, +2 more Red Hat Service Interconnect 2 skupper-cli 2.2.1-2.el8
    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
partial
Assessed
2 mo ago

Exploit prediction

0.61% chance of exploitation in the next 30 days, higher than 49% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/getkin/kin-openapi/security/advisories/GHSA-mmfr-pmjx-hw9w referenced PoC, tagged "exploit" by a source, unverified

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:N/A:H
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
go github.com/getkin/kin-openapi
>=0.10.0, <0.141.0
0.141.0

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.