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Fencer Vulns
medium 5.3

CVE-2024-7246 json

HPACK table poisoning in gRPC C++, Python & Ruby

published 2024-08-06 2 y ago modified 2026-06-17 4 mo ago also EUVD-2024-48194

cvss
5.3
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 12%
public exploits
0
none known

Summary

It's possible for a gRPC client communicating with a HTTP/2 proxy to poison the HPACK table between the proxy and the backend such that other clients see failed requests. It's also possible to use this vulnerability to leak other clients HTTP header keys, but not values.

This occurs because the error status for a misencoded header is not cleared between header reads, resulting in subsequent (incrementally indexed) added headers in the first request being poisoned until cleared from the HPACK table.

Please update to a fixed version of gRPC as soon as possible. This bug has been fixed in 1.58.3, 1.59.5, 1.60.2, 1.61.3, 1.62.3, 1.63.2, 1.64.3, 1.65.4.

Patch / fix

  • grpc grpc 1.58.3, 1.59.5, 1.60.2, 1.61.3, 1.62.3, 1.63.2, 1.64.3, 1.65.4
  • python-django rhui 4 4.2.15-1.el8ui
  • python-grpcio rhui 4 1.65.4-1.el8ui
  • python-jinja2 rhui 4 3.1.4-1.el8ui
  • python-aiohttp rhui 4 3.9.4-1.el8ui
  • python-gunicorn rhui 4 22.0.0-1.0.1.el8ui
  • python-requests rhui 4 2.32.3-2.el8ui
  • python-sqlparse rhui 4 0.5.0-1.el8ui
  • python3.11-django rhui 4 4.2.15-1.el8ui

red hat advisories RHSA-2025:1335RHSA-2024:8906RHSA-2024:6428

  • grpc SLE Module for Public Cloud 15 SP5, SLE Module for Basesystem 15 SP5, openSUSE Leap 15.5 1.60.0-150500.11.8.1
  • python-grpcio SLE Module for Python 3 15 SP5, SLE Module for Public Cloud 15 SP5, openSUSE Leap 15.5 1.60.1-150500.12.6.1
  • python-grpcio SLE Module for Public Cloud 15 SP4 1.60.1-150400.9.10.1
  • grpc SLE Module for Basesystem 15 SP6, openSUSE Leap 15.6 1.60.0-150600.15.3.1
  • grpc SLE Module for Public Cloud 15 SP4 1.60.0-150400.8.8.1
  • python-grpcio SLE Module for Public Cloud 15 SP6, openSUSE Leap 15.6 1.60.1-150600.16.8.1

suse advisories SUSE-SU-2024:4436-1SUSE-SU-2024:4429-1SUSE-SU-2024:4428-1SUSE-SU-2024:4401-1SUSE-SU-2024:4400-1SUSE-SU-2024:4393-1

  • python-grpcio openSUSE Tumbleweed 1.69.0-2.1

opensuse advisories openSUSE-SU-2025:15031-1

  • grpc Azure Linux 3.0 1.62.3-1

azure linux advisories AZL-47442

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

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-2024-7246 updated cvss 4.8

grpc: client communicating with a HTTP/2 proxy can poison the HPACK table between the proxy and the backend

  • Red Hat 3scale API Management Platform 2 3scale-amp2/apicast-gateway-rhel7
    affected: workaround, no fix planned “Will not fix”
  • Red Hat Ansible Automation Platform 2.4 for RHEL 8 python39-grpcio 1.58.3-1.el8ap, python3x-grpcio 1.58.3-1.el8ap Red Hat Ansible Automation Platform 2.4 for RHEL 9 python-grpcio 1.58.3-1.el9ap, python3-grpcio 1.58.3-1.el9ap
    fixed: vendor fix RHSA-2024:6428
  • Red Hat Satellite 6.16 for RHEL 8 python-grpcio 1.65.4-1.el8pc, python3.11-grpcio 1.65.4-1.el8pc Red Hat Satellite 6.16 for RHEL 9 python-grpcio 1.65.4-1.el9pc, python3.11-grpcio 1.65.4-1.el9pc
    fixed: vendor fix RHSA-2024:8906
  • Red Hat RHUI 4 for RHEL 8 python-grpcio 1.65.4-1.el8ui, python3.11-grpcio 1.65.4-1.el8ui
    fixed: vendor fix RHSA-2025:1335
  • Red Hat Builds for Red Hat OpenShift openshift-builds-waiters-rhel9, openshift-builds-webhook-rhel9, openshift-builds-rhel9-operator, openshift-builds-controller-rhel9, openshift-builds-git-cloner-rhel9, openshift-builds-triggers-container, +12 more Red Hat cert-manager Operator for Red Hat OpenShift cert-manager/cert-manager-operator-rhel9, cert-manager/jetstack-cert-manager-rhel9, cert-manager/jetstack-cert-manager-acmesolver-rhel9 Red Hat Cryostat 3 cryostat/cryostat-storage-rhel9, cryostat/cryostat-ose-oauth-proxy-rhel9 Red Hat Custom Metric Autoscaler operator for Red Hat Openshift custom-metrics-autoscaler/custom-metrics-autoscaler-rhel8, custom-metrics-autoscaler/custom-metrics-autoscaler-adapter-rhel8 Red Hat Kube Descheduler Operator kube-descheduler-operator/descheduler-rhel9, kube-descheduler-operator/kube-descheduler-rhel9-operator Red Hat Logging Subsystem for Red Hat OpenShift openshift-logging/logging-loki-rhel9, openshift-logging/loki-rhel8-operator, openshift-logging/lokistack-gateway-rhel8
    +28 more products
    Red Hat Logical Volume Manager Storage lvms4/topolvm-rhel9, lvms4/lvms-rhel9-operator, lvms4/lvms-must-gather-rhel9 Red Hat Migration Toolkit for Applications 7 mta/mta-cli-rhel9, mta/mta-windup-shim-rhel9, mta/mta-analyzer-lsp-rhel9, mta/mta-analyzer-addon-rhel9, mta-java-external-provider-container, mta-dotnet-external-provider-container, +1 more Red Hat Migration Toolkit for Containers rhmtc/openshift-migration-controller-rhel8, rhmtc/openshift-migration-velero-plugin-for-mtc-rhel8 Red Hat Migration Toolkit for Virtualization migration-toolkit-virtualization/mtv-validation-rhel9 Red Hat Multiarch Tuning Operator multiarch-tuning-rhel9-operator Red Hat Multicluster Engine for Kubernetes multicluster-engine/hive-rhel8, multicluster-engine/work-rhel9, multicluster-engine/placement-rhel8, multicluster-engine/cluster-api-rhel9, multicluster-engine/addon-manager-rhel9, multicluster-engine/agent-service-rhel8, +10 more Red Hat Network Observability Operator network-observability/network-observability-ebpf-agent-rhel9, network-observability/network-observability-flowlogs-pipeline-rhel9 Red Hat OpenShift API for Data Protection oadp/oadp-velero-rhel8, oadp/oadp-rhel8-operator, oadp/oadp-mustgather-rhel8, oadp/oadp-velero-plugin-rhel8, oadp/oadp-velero-plugin-for-aws-rhel8, oadp/oadp-velero-plugin-for-csi-rhel8, +4 more Red Hat OpenShift Developer Tools and Services ocp-tools-4/jenkins-rhel8, ocp-tools-4/jenkins-agent-base-rhel8 Red Hat OpenShift Pipelines openshift-pipelines-client Red Hat OpenShift Run Once Duration Override Operator run-once-duration-override-operator/run-once-duration-override-rhel9, run-once-duration-override-operator/run-once-duration-override-operator-rhel8 Red Hat OpenShift Secondary Scheduler Operator openshift-secondary-scheduler-operator/secondary-scheduler-operator-rhel8 Red Hat OpenShift Serverless openshift-serverless-clients, openshift-serverless-1/kn-client-kn-rhel9, openshift-serverless-1/kourier-control-rhel8, openshift-serverless-1/ingress-rhel8-operator, openshift-serverless-1/kn-serving-queue-rhel9, openshift-serverless-1/knative-rhel8-operator, +25 more Red Hat OpenShift Service Mesh 2 openshift-service-mesh/kiali-rhel8, openshift-service-mesh/pilot-rhel8, openshift-service-mesh/proxyv2-rhel8, openshift-service-mesh/proxyv2-rhel9, openshift-service-mesh/istio-cni-rhel8, openshift-service-mesh/ratelimit-rhel8, +1 more Red Hat 3scale API Management Platform 2 openresty openresty Red Hat Advanced Cluster Management for Kubernetes 2 rhacm2/subctl-rhel9, rhacm2/thanos-rhel7, rhacm2/volsync-rhel8, rhacm2/gatekeeper-rhel8, rhacm2/prometheus-rhel9, rhacm2/acm-grafana-rhel8, +18 more Red Hat Advanced Cluster Security 4 advanced-cluster-security/rhacs-main-rhel8, advanced-cluster-security/rhacs-roxctl-rhel8, advanced-cluster-security/rhacs-scanner-rhel8, advanced-cluster-security/rhacs-rhel8-operator, advanced-cluster-security/rhacs-central-db-rhel8, advanced-cluster-security/rhacs-scanner-db-rhel8, +4 more Red Hat Ansible Automation Platform 1.2 helm Red Hat Ansible Automation Platform 2.4 for RHEL 8 python39-zipp 3.19.2-1.el8ap, python39-django 4.2.15-1.el8ap, python3x-django 4.2.15-1.el8ap, python39-gunicorn 22.0.0-2.el8ap, python39-jmespath 0.10.0-5.el8ap, python3x-gunicorn 22.0.0-2.el8ap, +10 more Red Hat Ansible Automation Platform 2.4 for RHEL 9 python-zipp 3.19.2-1.el9ap, python3-zipp 3.19.2-1.el9ap, python-django 4.2.15-1.el9ap, python3-django 4.2.15-1.el9ap, python-gunicorn 22.0.0-2.el9ap, python-jmespath 0.10.0-5.el9ap, +11 more Red Hat Ceph Storage 5 rhceph/rhceph-5-dashboard-rhel8 Red Hat Ceph Storage 6 rhceph/rhceph-promtail-rhel9, rhceph/rhceph-6-dashboard-rhel9 Red Hat Ceph Storage 7 rhceph/grafana-rhel9, rhceph/rhceph-promtail-rhel9 Red Hat Connectivity Link 1 rhcl-1/authorino-rhel9, rhcl-1/dns-rhel9-operator, rhcl-1/rhcl-rhel9-operator, edo/external-dns-operator-bundle, rhcl-1/authorino-operator-bundle Red Hat Developer Hub 1 rhdh/rhdh-hub-rhel9, rhdh-operator-container Red Hat Enterprise Linux 7 rhc-worker-script Red Hat Enterprise Linux 8 rhc, conmon, podman, skopeo, buildah, grafana, +28 more Red Hat Enterprise Linux 9 conmon, podman, skopeo, buildah, grafana, ignition, +19 more
    not affected: vulnerable code not present

26 more not affected in the full advisory

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
2 y ago

Exploit prediction

0.22% chance of exploitation in the next 30 days, higher than 12% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/grpc/grpc/issues/36245 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 4.0 6.3 CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L
CNA 4.0 6.3 CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L/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
NVD 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected products

  • Google gRPC

Classification

Weakness
  • CWE-440 Expected Behavior Violation

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.