Skip to content
Fencer Vulns
high 8.7

CVE-2026-77354 json

kin-openapi: Uncontrolled resource consumption in openapi3filter deepObject query parameter decoding

published 2026-08-21 2 mo ago modified 2026-10-12 28 d ago also GHSA-xhj3-7xw9-vr34 , GO-2026-6275 , EUVD-2026-64151

cvss
8.7
version 4.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 44%
public exploits
0
none known

Summary

kin-openapi is a Go project for handling OpenAPI files. From 0.124.0 until 0.142.0, openapi3filter.sliceMapToSlice in openapi3filter/req_resp_decoder.go converts attacker-controlled sparse indexes from a deepObject query parameter into a dense slice by allocating entries from zero through the largest supplied index, after which buildResObj creates another slice of the same length. This allocation occurs before schema validation, so maxItems does not prevent it. An unauthenticated client can send a small query such as param[items][50000000]=x to an endpoint whose deepObject schema contains an array, forcing multi-gigabyte heap allocation and causing an OOM kill or restart loop. Other request-body encodings and styled parameters that do not produce bracketed integer indexes are not affected. This issue is fixed in version 0.142.0.

Patch / fix

  • go github.com/getkin/kin-openapi 0.142.0
  • 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-2026-77354 updated cvss 7.5

github.com/getkin/kin-openapi: kin-openapi: Denial of Service via uncontrolled resource consumption in deepObject query parameter decoding

  • Red Hat OpenShift Serverless openshift-serverless-1/kn-backstage-plugins-eventmesh-rhel9
    affected: no fix available
  • 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 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 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
  • Red Hat Multicluster Global Hub 1.7.4 multicluster-globalhub/multicluster-globalhub-grafana-rhel9 1793002792
    fixed: vendor fix RHSA-2026:95517
  • Red Hat Advanced Cluster Management for Kubernetes 2.13 rhacm2/acm-grafana-rhel9 1792865487
    fixed: vendor fix RHSA-2026:92307
  • 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
show 7 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 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-agent, flightctl-selinux, flightctl 0.10.0-1.el9em
    +8 more products
    Red Hat Advanced Cluster Management for Kubernetes 2.13 rhacm2/thanos-rhel9 1792872550, rhacm2/acm-cli-rhel9 1792972427, rhacm2/console-rhel9 1792883111, rhacm2/prometheus-rhel9 1792853139, rhacm2/acm-search-v2-rhel9 1792847370, rhacm2/node-exporter-rhel9 1792872412, +37 more Red Hat Ceph Storage 5 rhceph/rhceph-5-dashboard-rhel8 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, rhel9/grafana, grafana-selinux, osbuild-composer, grafana 12.4.3-2.el10, +5 more Red Hat Enterprise Linux 10 rhel10/grafana, 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 OpenStack Platform 18.0 rhoso-operators/openstack-operator-bundle 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

0.52% chance of exploitation in the next 30 days, higher than 44% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 8.7 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CNA 4.0 8.7 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/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

Affected packages

ecosystem package affected fixed in
go github.com/getkin/kin-openapi
>=0.124.0, <0.142.0
0.142.0

Affected products

  • getkin kin-openapi

Classification

Weakness
  • CWE-400 Uncontrolled Resource Consumption
  • CWE-789 Memory Allocation with Excessive Size Value

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.