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Fencer Vulns
medium 6.8

CVE-2026-53495 json

containerd CRI ExecSync Goroutine Leak Leading to Node-Level Denial of Service

published 2026-09-09 1 mo ago modified 2026-09-25 44 d ago also GHSA-7jxh-36q5-gcqv , GO-2026-6444 , EUVD-2026-77684

cvss
6.8
version 4.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 5%
public exploits
0
none known

Summary

containerd is an open-source container runtime. Prior to 1.7.35, 2.0.12, 2.2.8, and 2.3.5, containerd on Linux with the CRI plugin enabled can indefinitely block the drainExecSyncIO goroutine in internal/cri/server/container_execsync.go when CRI ExecSync is used by exec probes or lifecycle hooks that launch long-lived background child processes retaining standard input and output pipes. The input and output drain phase has no default timeout and did not stop when the request context was canceled, so repeated ExecSync invocations can accumulate blocked goroutines and host memory. The resulting resource exhaustion can cause the OOM killer to terminate containerd, leaving the container runtime unavailable until restart. Deployments not using containerd's CRI implementation and containers not running on Linux are not affected. This issue is fixed in versions 1.7.35, 2.0.12, 2.2.8, and 2.3.5.

Patch / fix

  • go github.com/containerd/containerd/v2 2.0.12, 2.2.8, 2.3.5
  • go github.com/containerd/containerd 1.7.35
  • containerd Debian 14 2.1.9+ds1-4

debian advisories DEBIAN-CVE-2026-53495

  • containerd Linux Micro 6.1 1.7.29-slfo.1.1_5.1
  • govulncheck-vulndb SLES 16.0, SLES for SAP applications 16.0 0.0.20260916T180043-160000.1.1
  • containerd SLES LTSS Extended Security 12 SP5 1.7.29-16.119.1

suse advisories SUSE-SU-2026:4923-1SUSE-SU-2026:24381-1SUSE-SU-2026:23855-1SUSE-SU-2026:23863-1

  • containerd openSUSE Tumbleweed 2.4.2-1.1
  • hauler openSUSE Leap 16.0 2.1.1-bp160.1.1
  • trivy openSUSE Tumbleweed 0.75.0-1.1
  • govulncheck-vulndb openSUSE Leap 16.0 0.0.20260916T180043-160000.1.1
  • trivy openSUSE Leap 16.0 0.74.0-160000.3.1
  • hauler openSUSE Tumbleweed 2.1.0-4.1

opensuse advisories openSUSE-SU-2026:12342-1openSUSE-SU-2026:22116-1openSUSE-SU-2026:11977-1openSUSE-SU-2026:21897-1openSUSE-SU-2026:21835-1openSUSE-SU-2026:11766-1

  • containerd Alpine 3.24 2.3.5-r0

alpine advisories ALPINE-CVE-2026-53495

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • moby-containerd-cc Azure Linux 3.0 1.7.7-19
  • containerd2 Azure Linux 3.0 2.3.7-1

azure linux advisories AZL-100986AZL-101004

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-2026-53495 updated cvss 5.5

github.com/containerd/containerd: containerd: Denial of Service via CRI ExecSync goroutine leak

  • Red Hat Assisted Installer for Red Hat OpenShift Container Platform 2 rhai/assisted-installer-agent-rhel9, rhai/assisted-installer-controller-rhel9, assisted/agent-preinstall-image-builder-rhel9 Red Hat AWS Load Balancer Operator albo/aws-load-balancer-controller-rhel8
    affected: no fix planned “Out of support scope”
  • Red Hat Compliance Operator compliance/openshift-compliance-must-gather-rhel8 Red Hat Confidential Compute Attestation build-of-trustee/trustee-must-gather-rhel9, openshift-sandboxed-containers/osc-monitor-rhel9, openshift-sandboxed-containers/osc-podvm-payload-rhel9, openshift-sandboxed-containers/osc-cloud-api-adaptor-rhel9 Red Hat Custom Metric Autoscaler operator for Red Hat Openshift custom-metrics-autoscaler/custom-metrics-autoscaler-rhel9-operator Red Hat Deployment Validation Operator dvo/deployment-validation-rhel8-operator Red Hat Gatekeeper 3 gatekeeper/gatekeeper-rhel9
    affected: no fix available “Fix deferred”
  • Red Hat Logging Subsystem for Red Hat OpenShift openshift-logging/cluster-logging-rhel9-operator
    affected: no fix planned “Out of support scope”
  • Red Hat Logical Volume Manager Storage lvms4/lvms-must-gather-rhel8, lvms4/lvms-must-gather-rhel9
    affected: no fix available, no fix planned “Out of support scope”
  • Red Hat Machine Deletion Remediation Operator workload-availability/machine-deletion-remediation-rhel9-operator, workload-availability/machine-deletion-remediation-operator-bundle
    affected: no fix planned “Out of support scope”
  • Red Hat MCP Server for Red Hat OpenShift openshift-mcp-beta/openshift-mcp-server-rhel9, openshift-mcp-tech-preview/openshift-mcp-server-rhel9 Red Hat Migration Toolkit for Containers rhmtc/openshift-migration-log-reader-rhel8, rhmtc/openshift-migration-must-gather-rhel8 Red Hat Migration Toolkit for Virtualization migration-toolkit-virtualization/mtv-must-gather-rhel8, migration-toolkit-virtualization/mtv-must-gather-rhel9
    affected: no fix available “Fix deferred”
  • Red Hat Multicluster Engine for Kubernetes multicluster-engine/assisted-service-8-rhel8, multicluster-engine/assisted-service-9-rhel9, multicluster-engine/assisted-installer-controller-rhel8, multicluster-engine/assisted-installer-controller-rhel9
    affected: no fix available, no fix planned “Out of support scope”
  • Red Hat Multicluster Global Hub multicluster-globalhub/multicluster-globalhub-agent-rhel9, multicluster-globalhub/multicluster-globalhub-grafana-rhel9, multicluster-globalhub/multicluster-globalhub-manager-rhel9, multicluster-globalhub/multicluster-globalhub-rhel9-operator
    affected: no fix available “Fix deferred”
show 12 more
  • Red Hat Node HealthCheck Operator workload-availability/node-healthcheck-must-gather-rhel8, workload-availability/node-healthcheck-must-gather-rhel9 Red Hat OpenShift Developer Tools and Services helm 3.20.2.1-77.el9, ocp-tools-4/jenkins-rhel8, ocp-tools-4/jenkins-rhel9, ocp-tools-4/jenkins-agent-base-rhel8
    affected: no fix planned “Out of support scope”
  • Red Hat OpenShift Lightspeed openshift-lightspeed/openshift-mcp-server-rhel9, openshift-lightspeed/lightspeed-agentic-sandbox-rhel9 Red Hat OpenShift Pipelines openshift-pipelines/pipelines-controller-rhel8, openshift-pipelines/pipelines-entrypoint-rhel8, openshift-pipelines/pipelines-results-watcher-rhel8, openshift-pipelines/pipelines-sidecarlogresults-rhel8 Red Hat OpenShift Serverless openshift-serverless-1/serverless-must-gather-rhel9
    affected: no fix available “Fix deferred”
  • Red Hat OpenShift Service Mesh 3 openshift-service-mesh/istio-rhel9-operator, openshift-service-mesh/istio-must-gather-rhel9
    affected: no fix available, no fix planned “Out of support scope”
  • Red Hat Pen Drive Powered by Red Hat Lightspeed pen-drive/pen-drive-scanner-rhel9 Red Hat Power monitoring for Red Hat OpenShift openshift-power-monitoring/power-monitoring-rhel9-operator
    affected: no fix available “Fix deferred”
  • Red Hat Advanced Cluster Management for Kubernetes 2 rhacm2/acm-grafana-rhel9, rhacm2/acm-must-gather-rhel9, rhacm2/multiclusterhub-rhel9, rhacm2/submariner-rhel9-operator, rhacm2/submariner-operator-bundle, rhacm2/multicloud-integrations-rhel9, +2 more
    affected: no fix available, no fix planned “Out of support scope”
  • Red Hat Advanced Cluster Security 4 advanced-cluster-security/rhacs-main-rhel9, advanced-cluster-security/rhacs-roxctl-rhel9, advanced-cluster-security/rhacs-rhel9-operator, advanced-cluster-security/rhacs-operator-bundle, advanced-cluster-security/rhacs-scanner-v4-rhel9
    affected: no fix available “Fix deferred”
  • Red Hat Ansible Automation Platform 2 ansible-automation-platform-24/ee-supported-rhel8, ansible-automation-platform-24/ee-supported-rhel9, ansible-automation-platform-25/ee-supported-rhel8, ansible-automation-platform-25/ee-supported-rhel9, ansible-automation-platform-26/ee-supported-rhel9, ansible-automation-platform-27/ee-supported-rhel9, +8 more
    affected: no fix available, no fix planned “Out of support scope”
  • Red Hat Ceph Storage 6 rhceph/rhceph-promtail-rhel9
    affected: no fix planned “Out of support scope”
  • Red Hat Ceph Storage 9 rhceph/alloy-rhel10 Red Hat Certification Program for Red Hat Enterprise Linux 9 redhat-certification-cnf 9.0-20240522.1.el9, rhcertification/redhat-certification-baremetal Red Hat Developer Hub 1 rhdh/rhdh-must-gather-rhel9 Red Hat Enterprise Linux 8 conmon, podman, skopeo, buildah, grafana, grafana-loki, +27 more Red Hat Enterprise Linux 9 conmon, podman, skopeo, buildah, grafana, podman-tests, +13 more Red Hat OpenShift AI (RHOAI) rhoai/rhai-cli-rhel9, rhoai/odh-must-gather-rhel9, rhoai/odh-spark-operator-rhel9, rhoai/odh-authbridge-proxy-rhel9, rhoai/odh-th06-cpu-torch291-py312-rhel9, rhoai/odh-th06-cuda130-torch291-py312-rhel9, +19 more
    +4 more products
    Red Hat OpenShift Container Platform 4 cri-o, conmon, podman, skopeo, cri-tools, openshift, +98 more Red Hat OpenShift Container Platform 5 cri-o, cri-tools, kata-containers, openshift-kni/commatrix, openshift5/ose-console-rhel9, openshift5/metallb-rhel9-operator, +17 more Red Hat Openshift Data Foundation 4 odf4/mcg-core-rhel9, odf4/odf-must-gather-rhel9 Red Hat OpenShift Dev Spaces devspaces/udi-rhel9
    affected: no fix available “Fix deferred”
  • Red Hat OpenShift for Windows Containers openshift4-wincw/windows-machine-config-rhel9-operator
    affected: no fix planned “Out of support scope”
  • Red Hat OpenShift GitOps openshift-gitops-1/argocd-rhel8, openshift-gitops-1/argocd-rhel9, openshift-gitops-1/must-gather-rhel8, openshift-gitops-1/must-gather-rhel9
    affected: no fix available “Fix deferred”
  • Red Hat OpenShift Virtualization 4 container-native-virtualization/cnv-must-gather-rhel8, container-native-virtualization/cnv-must-gather-rhel9, container-native-virtualization/cluster-network-addons-operator, container-native-virtualization/ocp-virt-validation-checkup-rhel9, container-native-virtualization/cluster-network-addons-operator-rhel9
    affected: no fix available, no fix planned “Out of support scope”

6 more affected, 3 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
55 d ago

Exploit prediction

0.16% chance of exploitation in the next 30 days, higher than 5% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 6.8 CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CNA 4.0 6.8 CVSS:4.0/AV:L/AC:L/AT:N/PR:L/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/containerd/containerd/v2
<2.0.12
>=2.2.0, <2.2.8
>=2.3.0, <2.3.5
2.0.12
2.2.8
2.3.5
go github.com/containerd/containerd
<1.7.35
1.7.35

Affected products

  • containerd containerd

Classification

Weakness
  • CWE-400 Uncontrolled Resource Consumption

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.