Evidence used
- No CISA KEV confirmation is currently recorded.
- Exploitation requires an existing local or physical foothold with privileges.
- EPSS is 0.16% for the current model date.
BlackTreeCVE IntelligenceFull vulnerability report · 2026
CVE-2026-53495High confidence
containerd CRI ExecSync Goroutine Leak Leading to Node-Level Denial of Service
containerd · containerd
Official source article: GitHub GHSA-7JXH-36Q5-GCQV ↗. Check the applicable product and release in the original source.
6.8MediumCVSS 4.0
Scheduled
Fix not verifiedMedium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.
R
Open reassessment dashboard →Operational reassessment
Published severity in operational context
Published severityMedium→Operational priority:Low, lowered one band.downgradedsince 14 Sep 2026
Compensating controls
- Restrict local access and enforce least privilege on affected hosts.
- Monitor vendor guidance and exploitation sources for a material change.
Verification
- Confirm that the asset runs containerd containerd and falls inside the recorded affected range.
- Recheck the vendor advisory before scheduling a change because no verified fixed version is currently retained.
- Validate exposure, authentication requirements and compensating controls in the actual environment.
- Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Distribution package intelligence
6 package statesRelease-specific package status
Debian, ubuntu findings are scoped to the named distribution, release and source package. An absent finding does not mean a package is unaffected.
Repository candidate not checked
A published vendor fix does not prove that a matching update is enabled and installable on a particular asset. Confirm the local package candidate before scheduling remediation.
| Distribution release | Source package | Vendor state | Fixed version | Evidence |
|---|---|---|---|---|
| Debian trixietrixie · source | containerd | Affected, no fix publishedDebian currently tracks this release as open. | Not published in this feed | Debian Security Tracker ↗Source updated 6 Oct 2026 |
| Debian bookwormbookworm · source | containerd | Affected, no fix publishedDebian currently tracks this release as open. | Not published in this feed | Debian Security Tracker ↗Source updated 6 Oct 2026 |
| Debian forkyforky · source | containerd | Affected, no fix publishedDebian currently tracks this release as open. | Not published in this feed | Debian Security Tracker ↗Source updated 6 Oct 2026 |
| Debian sidsid · source | containerd | Vendor fix publishedDebian records a fixed source-package version for this release. | 2.1.9+ds1-4 | Debian Security Tracker ↗Source updated 6 Oct 2026 |
| Ubuntu 24.04 LTSnoble · esm-apps | containerd | Under evaluationCanonical reports that the package might be affected and still needs evaluation or fixing. | Not published in this feed | Canonical Ubuntu Security ↗Source updated 6 Oct 2026 |
| Ubuntu 24.04 LTSnoble · standard archive | containerd-app | Under evaluationCanonical reports that the package might be affected and still needs evaluation or fixing. | Not published in this feed | Canonical Ubuntu Security ↗Source updated 6 Oct 2026 |
Open-source package ranges10 source-attributed ranges
These OSV and GitHub advisory ranges apply only to the named package and ecosystem. A listed fixed version is not a universal product patch or proof that an update is installed.
| Ecosystem and package | Affected range | First fixed version | Evidence |
|---|---|---|---|
| Gogithub.com/containerd/containerd | SEMVER: introduced 0; fixed 1.7.35 | 1.7.35 | OSV record ↗aggregator derived · 17 Sep 2026 |
| Gogithub.com/containerd/containerd | SEMVER: introduced 0; fixed 1.7.35 | 1.7.35 | OSV record ↗aggregator derived · 17 Sep 2026 |
| Gogithub.com/containerd/containerd/v2 | SEMVER: introduced 0; fixed 2.0.12 | 2.0.12 | OSV record ↗aggregator derived · 17 Sep 2026 |
| Gogithub.com/containerd/containerd/v2 | SEMVER: introduced 2.2.0; fixed 2.2.8 | 2.2.8 | OSV record ↗aggregator derived · 17 Sep 2026 |
| Gogithub.com/containerd/containerd/v2 | SEMVER: introduced 2.3.0; fixed 2.3.5 | 2.3.5 | OSV record ↗aggregator derived · 17 Sep 2026 |
| Gogithub.com/containerd/containerd/v2 | SEMVER: introduced 0; fixed 2.0.12; introduced 2.2.0; fixed 2.2.8; introduced 2.3.0; fixed 2.3.5 | 2.0.12, 2.2.8, 2.3.5 | OSV record ↗aggregator derived · 17 Sep 2026 |
| gogithub.com/containerd/containerd | < 1.7.35 | 1.7.35 | GitHub advisory ↗upstream repository advisory · 9 Sep 2026 |
| gogithub.com/containerd/containerd/v2 | < 2.0.12 | 2.0.12 | GitHub advisory ↗upstream repository advisory · 9 Sep 2026 |
| gogithub.com/containerd/containerd/v2 | >= 2.2.0, < 2.2.8 | 2.2.8 | GitHub advisory ↗upstream repository advisory · 9 Sep 2026 |
| gogithub.com/containerd/containerd/v2 | >= 2.3.0, < 2.3.5 | 2.3.5 | GitHub advisory ↗upstream repository advisory · 9 Sep 2026 |
Direct vendor intelligence
1 currentAuthoritative vendor CSAF and VEX advisories
Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.
CVE-2026-53495 · CSAF 2.0 · revision 3 · finalRed Hat Product Securitygithub.com/containerd/containerd: containerd: Denial of Service via CRI ExecSync goroutine leak
The vendor explicitly identifies these products as affected by this CVE.
- assisted/agent-preinstall-image-builder-rhel9 as a component of Assisted Installer for Red Hat OpenShift Container Platform 2
- rhai/assisted-installer-agent-rhel9 as a component of Assisted Installer for Red Hat OpenShift Container Platform 2
- rhai/assisted-installer-controller-rhel9 as a component of Assisted Installer for Red Hat OpenShift Container Platform 2
- albo/aws-load-balancer-controller-rhel8 as a component of AWS Load Balancer Operator
- compliance/openshift-compliance-must-gather-rhel8 as a component of Compliance Operator
- build-of-trustee/trustee-must-gather-rhel9 as a component of Confidential Compute Attestation
- openshift-sandboxed-containers/osc-cloud-api-adaptor-rhel9 as a component of Confidential Compute Attestation
- openshift-sandboxed-containers/osc-monitor-rhel9 as a component of Confidential Compute Attestation
- openshift-sandboxed-containers/osc-podvm-payload-rhel9 as a component of Confidential Compute Attestation
- custom-metrics-autoscaler/custom-metrics-autoscaler-rhel9-operator as a component of Custom Metric Autoscaler operator for Red Hat Openshift
- dvo/deployment-validation-rhel8-operator as a component of Deployment Validation Operator
- gatekeeper/gatekeeper-rhel9 as a component of Gatekeeper 3
- Summary
- A flaw was found in containerd. When the Container Runtime Interface (CRI) plugin is enabled on Linux, repeated use of CRI ExecSync by exec probes or lifecycle hooks can cause goroutines to become indefinitely blocked. This leads to resource exhaustion and can terminate the containerd process, making the container runtime unavailable. This issue specifically affects deployments utilizing containerd's CRI implementation on Linux.
- Remediation
- Fix deferred
Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.
Fix not verified01
What, why and how
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.
What
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.
Why
The product does not properly control the allocation and maintenance of a limited resource.
How
An attacker operating through local access may attempt exploitation with low privileges. If successful, the issue may disrupt the affected service.
What
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.
Why
The product does not properly control the allocation and maintenance of a limited resource.
How
An attacker operating through local access may attempt exploitation with low privileges. If successful, the issue may disrupt the affected service.
02
Exploit reality and attack path
CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.
Observed exploitation No confirmed evidence
?
Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.
Public PoC / exploit material None recorded
?
Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.
- Likely attack path
- local access → Uncontrolled Resource Consumption → disrupt the affected service
- Attack surface
- Local
- Privileges required
- Low: a basic authenticated account is required
- User interaction
- None
- Attack complexity
- Low: no specialised conditions are recorded
- Security boundary
- Not a CVSS 4.0 base metric
- Weakness
?
CWE means Common Weakness Enumeration: a standard category for the underlying weakness. - CWE-400 ↗
CWE-400: Uncontrolled Resource Consumption. The product does not properly control the allocation and maintenance of a limited resource.
- CVSS vector
?
CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity. CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:NCommon Vulnerability Scoring System 4.0: the compact vector below is decoded into plain language.
AVLocalAttack vector: The attacker needs local access to the vulnerable system.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.ATNoneAttack requirements: No additional deployment or execution condition is required.PRLowPrivileges required: The attacker needs basic user-level privileges.UINoneUser interaction: No action by another user is required.VCNoneVulnerable-system confidentiality: No direct loss is represented by this metric.VINoneVulnerable-system integrity: No direct loss is represented by this metric.VAHighVulnerable-system availability: A successful attack can cause a major loss.SCNoneSubsequent-system confidentiality: No direct loss is represented by this metric.SINoneSubsequent-system integrity: No direct loss is represented by this metric.SANoneSubsequent-system availability: No direct loss is represented by this metric.- Post-exploitation / living off the land
- The issue can support a local privilege or sandbox boundary transition; normal system utilities may then be available in the gained context.
03
Patch and workaround
Operational remediation based on structured source evidence.
- Status
?
Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change. - Fix not verified
- Affected
- assisted/agent-preinstall-image-builder-rhel9 as a component of Assisted Installer for Red Hat OpenShift Container Platform 2
- rhai/assisted-installer-agent-rhel9 as a component of Assisted Installer for Red Hat OpenShift Container Platform 2
- rhai/assisted-installer-controller-rhel9 as a component of Assisted Installer for Red Hat OpenShift Container Platform 2
- albo/aws-load-balancer-controller-rhel8 as a component of AWS Load Balancer Operator
- compliance/openshift-compliance-must-gather-rhel8 as a component of Compliance Operator
- build-of-trustee/trustee-must-gather-rhel9 as a component of Confidential Compute Attestation
- openshift-sandboxed-containers/osc-cloud-api-adaptor-rhel9 as a component of Confidential Compute Attestation
- openshift-sandboxed-containers/osc-monitor-rhel9 as a component of Confidential Compute Attestation
- openshift-sandboxed-containers/osc-podvm-payload-rhel9 as a component of Confidential Compute Attestation
- custom-metrics-autoscaler/custom-metrics-autoscaler-rhel9-operator as a component of Custom Metric Autoscaler operator for Red Hat Openshift
- dvo/deployment-validation-rhel8-operator as a component of Deployment Validation Operator
- gatekeeper/gatekeeper-rhel9 as a component of Gatekeeper 3
- openshift-logging/cluster-logging-rhel9-operator as a component of Logging Subsystem for Red Hat OpenShift
- lvms4/lvms-must-gather-rhel8 as a component of Logical Volume Manager Storage
- lvms4/lvms-must-gather-rhel9 as a component of Logical Volume Manager Storage
- workload-availability/machine-deletion-remediation-operator-bundle as a component of Machine Deletion Remediation Operator
- workload-availability/machine-deletion-remediation-rhel9-operator as a component of Machine Deletion Remediation Operator
- openshift-mcp-beta/openshift-mcp-server-rhel9 as a component of MCP Server for Red Hat OpenShift
- openshift-mcp-tech-preview/openshift-mcp-server-rhel9 as a component of MCP Server for Red Hat OpenShift
- rhmtc/openshift-migration-log-reader-rhel8 as a component of Migration Toolkit for Containers
- rhmtc/openshift-migration-must-gather-rhel8 as a component of Migration Toolkit for Containers
- migration-toolkit-virtualization/mtv-must-gather-rhel8 as a component of Migration Toolkit for Virtualization
- migration-toolkit-virtualization/mtv-must-gather-rhel9 as a component of Migration Toolkit for Virtualization
- multicluster-engine/assisted-installer-controller-rhel8 as a component of Multicluster Engine for Kubernetes
- multicluster-engine/assisted-installer-controller-rhel9 as a component of Multicluster Engine for Kubernetes
- multicluster-engine/assisted-service-8-rhel8 as a component of Multicluster Engine for Kubernetes
- multicluster-engine/assisted-service-9-rhel9 as a component of Multicluster Engine for Kubernetes
- multicluster-globalhub/multicluster-globalhub-agent-rhel9 as a component of Multicluster Global Hub
- multicluster-globalhub/multicluster-globalhub-grafana-rhel9 as a component of Multicluster Global Hub
- multicluster-globalhub/multicluster-globalhub-manager-rhel9 as a component of Multicluster Global Hub
- and 294 more
- Fixed
- No fixed version is explicitly recorded in the structured CVE data.
- Action
- No verified patch reference is present in the current structured sources. Check the vendor advisory before making a change.
- Workaround
- No verified workaround is recorded. Limit untrusted access and use least privilege until authoritative guidance is available.
04
Evidence and provenance
Published 14 Sept 2026 · Last source change 14 Sept 2026, 17:34 UTC · CWE-400 · Uncontrolled Resource Consumption
CVE recordCVE.org · 5.2
CVSS sourceCNA
EPSS source FIRST · tracked since 2026-09-15
?
The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.European sourceENISA EUVD · EUVD-2026-77684
Product sourceVendor CSAF · Red Hat Product Security
Remediation sourceVendor CSAF · Red Hat Product Security
CWE sourceCNA
NVD statusNVD awaiting enrichment
Core structured fields are present and their contributing authorities are shown above.
Material change intelligence
View recent updates ↗What changed after publication
- ENISA EUVD mappingEUVD-2026-77684 was added to the official ENISA EUVD mapping for this CVE.ENISA EUVD ↗
- Before
- not recorded
- After
- {"euvdId":"EUVD-2026-77684"}
- Catalogue recordCVE added to the BlackTree catalogue.CNA ↗
Technical terms and abbreviations used in this report
- CVE
- Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
- CVSS
- Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
- EPSS
- Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
- CWE
- Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
- CNA
- CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
- CISA ADP
- Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
- NVD
- National Vulnerability Database: NIST's enrichment service for CVE records.
- CERT / CSIRT
- A computer security incident response team that publishes warnings or coordinates incident response.
- PoC
- Proof of concept: public material that demonstrates or helps reproduce exploitation.
- CSAF
- Common Security Advisory Framework: a machine-readable format for security advisories.
- LoTL
- Living off the land: abuse of legitimate tools or system functions during an attack.