Vulnerabilities
Misconfiguration
Compliance
CVE Vulnerabilities

CVE-2026-33811

Double Free

Published: May 07, 2026 | Modified: Jul 31, 2026
CVSS 3.x
7.5
HIGH
Source:
NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.x
RedHat/V2
RedHat/V3
7.5 IMPORTANT
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Ubuntu
MEDIUM
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Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2026-33811
CWEhttps://cwe.mitre.org/data/definitions/415.html

When using LookupCNAME with the cgo DNS resolver, a very long CNAME response can trigger a double-free of C memory and a crash.

Weakness

The product calls free() twice on the same memory address.

Affected Software

NameVendorStart VersionEnd Version
GoGolang*1.25.10 (excluding)
GoGolang1.26.0 (including)1.26.3 (excluding)
Cryostat 4 on RHEL 9RedHatcryostat/cryostat-storage-rhel9:4.2.0-19*
Red Hat Ansible Automation Platform 2.5 for RHEL 8RedHatreceptor-0:1.6.6-1.el8ap*
Red Hat Ansible Automation Platform 2.5 for RHEL 9RedHatreceptor-0:1.6.6-1.el9ap*
Red Hat Ansible Automation Platform 2.6 for RHEL 10RedHatreceptor-0:1.6.6-1.el10ap*
Red Hat Ansible Automation Platform 2.6 for RHEL 9RedHatreceptor-0:1.6.6-1.el9ap*
Red Hat Enterprise Linux 10RedHatopentelemetry-collector-0:0.152.1-1.el10_2*
Red Hat Enterprise Linux 10RedHatgolang-github-openprinting-ipp-usb-0:0.9.27-7.el10_2.2*
Red Hat Enterprise Linux 10RedHatgit-lfs-0:3.7.1-5.el10_2.6*
Red Hat Enterprise Linux 10RedHatyggdrasil-0:0.4.9.2-1.el10_2*
Red Hat Enterprise Linux 10RedHatrhc-worker-playbook-0:0.2.10-1.el10_2*
Red Hat Enterprise Linux 8RedHatrhc-1:0.2.5-8.el8_10*
Red Hat Enterprise Linux 8RedHatcontainer-tools:rhel8-8100020260709093628.afee755d*
Red Hat Enterprise Linux 8RedHatgit-lfs-0:3.4.1-12.el8_10*
Red Hat Enterprise Linux 9RedHatopentelemetry-collector-0:0.152.1-1.el9_8*
Red Hat Enterprise Linux 9RedHatoci-seccomp-bpf-hook-0:1.2.11-2.el9_8*
Red Hat Enterprise Linux 9RedHatgit-lfs-0:3.7.1-4.el9_8.2*
Red Hat OpenStack Services on OpenShift 18.0RedHatgolang-github-openstack-k8s-operators-os-diff-0:0.1.1-18.0.20260602234716.a95ae05.el9ost*
Red Hat Satellite 6.16 for RHEL 8RedHatyggdrasil-worker-forwarder-0:0.0.4-1.el8sat*
Red Hat Satellite 6.16 for RHEL 9RedHatyggdrasil-worker-forwarder-0:0.0.4-1.el9sat*
Red Hat Satellite 6.17 for RHEL 9RedHatyggdrasil-worker-forwarder-0:0.0.4-1.el9sat*
Red Hat Satellite 6.18 for RHEL 9RedHatyggdrasil-worker-forwarder-0:0.0.4-1.el9sat*
Red Hat Satellite 6.19 for RHEL 9RedHatyggdrasil-worker-forwarder-0:0.0.4-1.el9sat*
RHEM 1.0 for RHEL 9RedHatflightctl-0:1.0.3-1.el9em*
RHEM 1.1 for RHEL 10RedHatflightctl-0:1.1.3-1.el10em*
RHEM 1.1 for RHEL 9RedHatflightctl-0:1.1.3-1.el9em*
Logging Subsystem for Red Hat OpenShift 6.2RedHatopenshift-logging/eventrouter-rhel9:1784747813*
Logging Subsystem for Red Hat OpenShift 6.4RedHatopenshift-logging/eventrouter-rhel9:1782408807*
Multicluster engine for Kubernetes 2.1RedHatmulticluster-engine/discovery-rhel9:1784915379*
Multicluster engine for Kubernetes 2.1RedHatmulticluster-engine/discovery-rhel9:1784915379*
Multicluster engine for Kubernetes 2.6RedHatmulticluster-engine/discovery-rhel9:1783985999*
Multicluster engine for Kubernetes 2.8RedHatmulticluster-engine/discovery-rhel9:1784306906*
Multicluster Global Hub 1.4.5RedHatmulticluster-globalhub/multicluster-globalhub-agent-rhel9:1784061472*
Multicluster Global Hub 1.6.2RedHatmulticluster-globalhub/multicluster-globalhub-agent-rhel9:1784152046*
Multicluster Global Hub 1.7.2RedHatmulticluster-globalhub/multicluster-globalhub-agent-rhel9:1784768332*
OpenShift API for Data Protection 1.6RedHatoadp/oadp-velero-rhel9:1784058822*
Red Hat Advanced Cluster Security for Kubernetes 4.10RedHatadvanced-cluster-security/rhacs-main-rhel8:1783357140*
Red Hat Advanced Cluster Security for Kubernetes 4.11RedHatadvanced-cluster-security/rhacs-main-rhel9:1783352589*
Red Hat Advanced Cluster Security for Kubernetes 4.9RedHatadvanced-cluster-security/rhacs-main-rhel8:1783357116*
Red Hat Ansible Automation Platform 2.6RedHatansible-automation-platform-26/receptor-rhel9:1783962464*
Red Hat Developer Hub 1.9RedHatrhdh/rhdh-rhel9-operator:1782767215*
Red Hat Edge Manager 1.0RedHatrhem/flightctl-ui-rhel9:1783502438*
Red Hat Edge Manager 1.1RedHatrhem/flightctl-ui-rhel10:1784194574*
Red Hat Edge Manager 1.1RedHatrhem/flightctl-ui-rhel9:1784127736*
Red Hat Hardened ImagesRedHatgolang1-25-main-1.25.11-2.hum1*
Red Hat Hardened ImagesRedHatgolang1-26-main-1.26.4-2.hum1*
Red Hat Migration Toolkit 1.8RedHatrhmtc/openshift-migration-registry-rhel8:1783914276*
Red Hat Migration Toolkit for Applications 8.2RedHatmta/mta-cli-rhel9:1784211378*
Red Hat multicluster global hub 1.5.0RedHatmulticluster-globalhub/multicluster-globalhub-agent-rhel9:1784127491*
Red Hat OpenShift AI 2.25RedHatrhoai/odh-kueue-controller-rhel9:1783544461*
Red Hat OpenShift AI 2.25RedHatrhoai/odh-training-operator-rhel9:1783946386*
Red Hat OpenShift Builds 1.7.4RedHatopenshift-builds/openshift-builds-waiters-rhel9:1783057868*
Red Hat OpenShift GitOps 1.19RedHatopenshift-gitops-1/dex-rhel8:1782292352*
Red Hat OpenShift GitOps 1.20RedHatopenshift-gitops-1/dex-rhel9:1782383826*
Red Hat OpenShift GitOps 1.21RedHatopenshift-gitops-1/dex-rhel9:1782910941*
Red Hat OpenShift Service Mesh 3.0RedHatopenshift-service-mesh/istio-cni-rhel9:1782222217*
Red Hat OpenShift Service Mesh 3.0RedHatopenshift-service-mesh/istio-pilot-rhel9:1782223341*
Red Hat OpenShift Service Mesh 3.0RedHatopenshift-service-mesh/istio-proxyv2-rhel9:1782296193*
Red Hat OpenShift Service Mesh 3.0RedHatopenshift-service-mesh/istio-rhel9-operator:1782222607*
Red Hat OpenShift Service Mesh 3.1RedHatopenshift-service-mesh/istio-cni-rhel9:1782222163*
Red Hat OpenShift Service Mesh 3.1RedHatopenshift-service-mesh/istio-pilot-rhel9:1782223138*
Red Hat OpenShift Service Mesh 3.1RedHatopenshift-service-mesh/istio-proxyv2-rhel9:1782222394*
Red Hat OpenShift Service Mesh 3.1RedHatopenshift-service-mesh/istio-rhel9-operator:1782222451*
Red Hat OpenShift Service Mesh 3.2RedHatopenshift-service-mesh/istio-cni-rhel9:1782226178*
Red Hat OpenShift Service Mesh 3.2RedHatopenshift-service-mesh/istio-pilot-rhel9:1782224487*
Red Hat OpenShift Service Mesh 3.2RedHatopenshift-service-mesh/istio-proxyv2-rhel9:1782303211*
Red Hat OpenShift Service Mesh 3.2RedHatopenshift-service-mesh/istio-rhel9-operator:1782224541*
Red Hat OpenShift Service Mesh 3.3RedHatopenshift-service-mesh/istio-cni-rhel9:1782223045*
Red Hat OpenShift Service Mesh 3.3RedHatopenshift-service-mesh/istio-pilot-rhel9:1782222366*
Red Hat OpenShift Service Mesh 3.3RedHatopenshift-service-mesh/istio-proxyv2-rhel9:1782310747*
Red Hat OpenShift Service Mesh 3.3RedHatopenshift-service-mesh/istio-rhel9-operator:1782222038*
Red Hat Trusted Artifact Signer 1.4RedHatconforma-cli-stack-v1-4-1.4.2*
Red Hat Trusted Artifact Signer 1.4RedHatconforma-cli-stack-v1-4-1.4.2*
Red Hat Trusted Artifact Signer 1.4RedHatconforma-cli-stack-v1-4-1.4.3*
Red Hat Web Terminal 1.11RedHatweb-terminal/web-terminal-exec-rhel9:1784296203*
Red Hat Web Terminal 1.12RedHatweb-terminal/web-terminal-exec-rhel9:1784247610*
Red Hat Web Terminal 1.13RedHatweb-terminal/web-terminal-exec-rhel9:1784296127*
Red Hat Web Terminal 1.14RedHatweb-terminal/web-terminal-exec-rhel9:1784296114*
Red Hat Web Terminal 1.15RedHatweb-terminal/web-terminal-exec-rhel9:1784296033*
Red Hat Web Terminal 1.16RedHatweb-terminal/web-terminal-exec-rhel9:1784295767*
Golang-1.10Ubuntuesm-infra/xenial*
Golang-1.13Ubuntuesm-apps/xenial*
Golang-1.18Ubuntuesm-apps/xenial*
Golang-1.23Ubuntuquesting*
Golang-1.24Ubuntuquesting*
Golang-1.25Ubuntuquesting*
Golang-1.6Ubuntuesm-infra/xenial*

Potential Mitigations

References

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