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Fencer Vulns
high 7.5

CVE-2026-33811 json

Crash when handling long CNAME response in net

published 2026-05-07 6 mo ago modified 2026-10-26 14 d ago also BIT-golang-2026-33811 , EUVD-2026-28419 , GO-2026-4981

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.9%
EPSS 0.9% chance of exploitation in 30 days, percentile 59%
public exploits
0
none known

Summary

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

Patch / fix

  • bitnami golang 1.25.10, 1.26.3
  • go stdlib 1.25.10, 1.26.3
  • Go standard library net 1.25.10, 1.26.3
  • Red Hat Cryostat 4 on RHEL 9 4.2.0-19
  • Red Hat Red Hat Ansible Automation Platform 2.5 for RHEL 8 0:1.6.6-1.el8ap, 0:2.5.10-7.el8ap
  • Red Hat Red Hat Ansible Automation Platform 2.5 for RHEL 9 0:1.6.6-1.el9ap, 0:2.6.17-2.el9ap
  • Red Hat Red Hat Ansible Automation Platform 2.6 for RHEL 10 0:1.6.6-1.el10ap
  • Red Hat Red Hat Ansible Automation Platform 2.6 for RHEL 9 0:1.6.6-1.el9ap, 0:2.6.17-2.el9ap
  • Red Hat Red Hat Enterprise Linux 10 0:0.2.10-1.el10_2, 0:0.4.9.2-1.el10_2, 0:0.9.27-7.el10_2.2, 0:0.152.1-1.el10_2, 0:1.26.3-4.el10_2, 0:3.7.1-5.el10_2.6, 0:52.1-1.el10_2.2
  • Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support 0:0.2.3-6.el10_0, 0:0.4.7-5.el10_0, 0:0.152.1-1.el10_0, 0:1.26.1-1.el10_0, 0:1.26.5-1.el10_0, 0:3.6.1-2.el10_0.7, 1:0.3.2-6.el10_0
  • Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support 0:0.11-1.el7_9
  • Red Hat Red Hat Enterprise Linux 8 0:3.4.1-12.el8_10, 1:0.2.5-8.el8_10, 8100020260518131104.a3795dee, 8100020260709093628.afee755d
  • Red Hat Red Hat Enterprise Linux 9 0:0.152.1-1.el9_8, 0:1.2.11-2.el9_8, 0:1.26.3-1.el9_8, 0:3.7.1-4.el9_8.2, 0:52.1-1.el9_8.2
  • Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions 0:1.26.5-1.el9_2, 0:3.2.0-2.el9_2.10
  • Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions 0:0.152.1-1.el9_4, 0:1.26.5-1.el9_4
  • Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support 0:0.152.1-1.el9_6, 0:1.26.5-1.el9_6, 0:3.6.1-2.el9_6.7
  • Red Hat Red Hat OpenShift Container Platform 4.14 0:0.19.0-5.rhaos4.14.el8, 0:1.27.0-8.el8, 0:4.14.0-202608131802.p2.g9a7820e.assembly.stream.el8, 0:4.14.0-202608131802.p2.g44b3ac2.assembly.stream.el8, 1787001863, 1787002807
  • Red Hat Red Hat OpenShift Container Platform 4.15 0:0.20.0-6.rhaos4.15.el8, 0:1.28.0-9.el8, 0:4.15.0-202608131733.p2.g5cb2ef4.assembly.stream.el8, 0:4.15.0-202608131733.p2.g5638728.assembly.stream.el8, 0:4.15.0-202608131733.p2.g8231637.assembly.stream.el8, 0:4.15.0-202608131733.p2.gfc50272.assembly.stream.el8, 0:4.15.0-202608131733.p2.gfd77d92.assembly.stream.el8, 1787028097, 1787055135
  • Red Hat Red Hat OpenShift Container Platform 4.16 0:0.21.0-6.rhaos4.16.el8, 0:1.29.0-8.el8, 0:4.16.0-202608111505.p2.g6f88b58.assembly.stream.el8, 0:4.16.0-202608111505.p2.g26b43df.assembly.stream.el8, 0:4.16.0-202608111505.p2.g41c4e9b.assembly.stream.el8, 0:4.16.0-202608111505.p2.ga3ebdc0.assembly.stream.el8, 0:4.16.0-202608111505.p2.ga53e9de.assembly.stream.el8, 1786788331
  • Red Hat Red Hat OpenShift Container Platform 4.17 0:1.30.0-9.el8, 0:4.17.0-202608122146.p2.g5bcfbfd.assembly.stream.el8, 0:4.17.0-202608122146.p2.g8ce997d.assembly.stream.el8, 0:4.17.0-202608122146.p2.g144bace.assembly.stream.el8, 0:4.17.0-202608132055.p2.g4e295fa.assembly.stream.el8, 0:4.17.0-202608201812.p2.g7189593.assembly.stream.el8, 1787554347
  • Red Hat Red Hat OpenShift Container Platform 4.18 0:0.23.0-5.rhaos4.18.el8, 0:1.31.1-7.el8, 0:4.18.0-202608121933.p2.g6ea2356.assembly.stream.el8, 0:4.18.0-202608121933.p2.g9795abd.assembly.stream.el8, 0:4.18.0-202608121933.p2.gc395190.assembly.stream.el8, 0:4.18.0-202608132034.p2.g6febe61.assembly.stream.el8, 0:4.18.0-202608132034.p2.g91c2408.assembly.stream.el8, 1786754425
  • Red Hat Red Hat OpenShift Container Platform 4.19 0:1.32.0-6.el9, 0:4.19.0-202608111604.p2.g63adf01.assembly.stream.el9, 0:4.19.0-202608111604.p2.g425c1c5.assembly.stream.el9, 0:4.19.0-202608111604.p2.gb2a93a6.assembly.stream.el8, 1786490745
  • Red Hat Red Hat OpenStack Platform 16.2 0:0.2.1-1.1.el8ost, 0:3.3.23-22.el8ost
  • Red Hat Red Hat OpenStack Services on OpenShift 18.0 0:0.1.1-18.0.20260602234716.a95ae05.el9ost, 1786612662
  • Red Hat Red Hat Satellite 6.16 for RHEL 8 0:0.0.4-1.el8sat
  • Red Hat Red Hat Satellite 6.16 for RHEL 9 0:0.0.4-1.el9sat
  • Red Hat Red Hat Satellite 6.17 for RHEL 9 0:0.0.4-1.el9sat
  • Red Hat Red Hat Satellite 6.18 for RHEL 9 0:0.0.4-1.el9sat
  • Red Hat Red Hat Satellite 6.19 for RHEL 9 0:0.0.4-1.el9sat
  • Red Hat RHEM 1.0 for RHEL 9 0:1.0.3-1.el9em
  • golang-1.26 Debian 14 1.26.3-1

debian advisories DEBIAN-CVE-2026-33811

  • cri-o openshift 4.19 1.32.13-14.rhaos4.19.git3c1400a.el9
  • openshift openshift 4.19 4.19.0-202609141900.p2.g63adf01.assembly.stream.el9
  • openshift-clients openshift 4.19 4.19.0-202609141900.p2.ga2c805b.assembly.stream.el8
  • openshift-clients openshift 4.19 4.19.0-202609141900.p2.ga2c805b.assembly.stream.el9
  • openshift-kubelet openshift 4.19 4.19.0-202609141900.p2.g63adf01.assembly.stream.el9
  • openshift-hyperkube openshift 4.19 4.19.0-202609141900.p2.g63adf01.assembly.stream.el9
  • openshift-kube-apiserver openshift 4.19 4.19.0-202609141900.p2.g63adf01.assembly.stream.el9
  • openshift-kube-scheduler openshift 4.19 4.19.0-202609141900.p2.g63adf01.assembly.stream.el9

red hat advisories RHSA-2026:72805RHSA-2026:72737RHSA-2026:72276RHSA-2026:68534RHSA-2026:67319RHSA-2026:67287

  • go1.25-openssl SLES for SAP applications 16.0, SLES 16.0 1.25.12-160000.1.1
  • go1.26-openssl SLES for SAP applications 16.0, SLES 16.0 1.26.4-160000.1.1

suse advisories SUSE-SU-2026:22638-1SUSE-SU-2026:22572-1

  • govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1
  • go1.25-openssl openSUSE Leap 16.0 1.25.12-160000.1.1
  • go1.26-openssl openSUSE Leap 16.0 1.26.4-160000.1.1
  • go1.26 openSUSE Tumbleweed 1.26.3-1.1
  • go1.25 openSUSE Tumbleweed 1.25.10-1.1

opensuse advisories openSUSE-SU-2026:21483-1openSUSE-SU-2026:21319-1openSUSE-SU-2026:21254-1openSUSE-SU-2026:10741-1openSUSE-SU-2026:10723-1

  • git-lfs AlmaLinux 8 3.4.1-12.el8_10
  • git-lfs AlmaLinux 10 3.7.1-5.el10_2.6
  • git-lfs AlmaLinux 9 3.7.1-4.el9_8.2
  • yggdrasil AlmaLinux 10 0.4.9.2-1.el10_2
  • crit AlmaLinux 8 3.18-5.module_el8.10.0+4047+545787c4
  • crit AlmaLinux 8 3.18-5.module_el8.10.0+3901+4b80ecd7
  • crit AlmaLinux 8 3.18-5.module_el8.10.0+4120+03ad4b47
  • crit AlmaLinux 8 3.18-5.module_el8.10.0+3845+87b84552

almalinux advisories ALSA-2026:39266ALSA-2026:39272ALSA-2026:39319ALSA-2026:39573ALSA-2026:38504ALSA-2026:36617

  • image-builder Rocky Linux 9 52.1-1.el9_8.2
  • image-builder Rocky Linux 10 52.1-1.el10_2.2.rocky.0.1
  • golang Rocky Linux 10 1.26.3-4.el10_2
  • golang Rocky Linux 9 1.26.3-1.el9_8
  • delve Rocky Linux 8 1.25.2-1.module+el8.10.0+40035+ee0a7047
  • golang Rocky Linux 8 1.25.10-1.module+el8.10.0+40200+0fd0f175
  • git-lfs Rocky Linux 10 3.7.1-5.el10_2.6
  • yggdrasil Rocky Linux 10 0.4.9.2-1.el10_2

rocky linux advisories RLSA-2026:65886RLSA-2026:65534RLSA-2026:22120RLSA-2026:22121RLSA-2026:22112RLSA-2026:39272

  • go Alpine 3.23 1.25.10-r0
  • go Alpine 3.24 1.26.3-r0
  • rclone Alpine 3.24 1.74.1-r0

alpine advisories ALPINE-CVE-2026-33811

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

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-2026-33811 updated cvss 7.5

net: golang: Go net package: Denial of Service via long CNAME response in LookupCNAME

  • Red Hat Assisted Installer for Red Hat OpenShift Container Platform 2 rhai/assisted-installer-rhel9
    affected: workaround, no fix available
  • Red Hat Confidential Compute Attestation build-of-trustee/trustee-rhel9-operator, openshift-sandboxed-containers/osc-monitor-rhel9, confidential-compute-attestation-tech-preview/trustee-rhel9-operator
    affected: workaround, no fix planned “Will not fix”
  • Red Hat Deployment Validation Operator dvo/deployment-validation-rhel8-operator
    affected: workaround, no fix available
  • Red Hat External Secrets Operator for Red Hat OpenShift external-secrets-operator/external-secrets-rhel9
    affected: workaround, no fix planned “Will not fix”
  • Red Hat ExternalDNS Operator edo/external-dns-rhel9, edo/external-dns-rhel9-operator Red Hat Fence Agents Remediation Operator workload-availability/fence-agents-remediation-rhel8-operator, redhat-user-workloads/rhwa-tenant/fence-agents-remediation/far-operator-0-8 Red Hat File Integrity Operator compliance/openshift-file-integrity-rhel8-operator Red Hat Gatekeeper 3 gatekeeper/gatekeeper-rhel9-operator
    affected: workaround, no fix available
  • Red Hat Logging Subsystem for Red Hat OpenShift openshift-logging/cluster-logging-rhel9-operator
    affected: workaround, no fix planned “Will not fix”
  • Red Hat Logical Volume Manager Storage lvms4/topolvm-rhel8, lvms4/topolvm-rhel9 Red Hat Machine Deletion Remediation Operator workload-availability/machine-deletion-remediation-rhel8-operator, redhat-user-workloads/rhwa-tenant/machine-deletion-remediation/mdr-operator-0-7
    affected: workaround, no fix available
  • Red Hat mirror registry for Red Hat OpenShift openshift/mirror-registry-rhel8
    affected: workaround, no fix available “Fix deferred”
show 10 more
  • Red Hat Multiarch Tuning Operator multiarch-tuning/multiarch-tuning-rhel9-operator Red Hat Multicluster Engine for Kubernetes multicluster-engine/maestro-rhel9, multicluster-engine/assisted-service-9-rhel9
    affected: workaround, no fix available
  • Red Hat Multicluster Global Hub multicluster-globalhub/multicluster-globalhub-agent-rhel8
    affected: workaround, no fix planned “Will not fix”
  • Red Hat Network Observability Operator network-observability/network-observability-cli-rhel9 Red Hat Node HealthCheck Operator workload-availability/node-healthcheck-rhel8-operator, node-healthcheck-operator-tech-preview/node-healthcheck-operator-rhel8, node-healthcheck-operator-tech-preview/node-healthcheck-rhel8-operator, redhat-user-workloads/rhwa-tenant/node-healthcheck-operator/nhc-operator-0-12 Red Hat Node Maintenance Operator redhat-user-workloads/rhwa-tenant/node-maintenance-operator/nmo-operator-5-7 Red Hat OpenShift Developer Tools and Services helm Red Hat OpenShift Lightspeed openshift-lightspeed/lightspeed-rhel9-operator Red Hat OpenShift Pipelines openshift-pipelines-client
    +3 more products
    Red Hat OpenShift Serverless kn-workflow-plugin, openshift-serverless-clients, openshift-serverless-1/kn-plugin-event-sender-rhel9 Red Hat OpenShift Service Mesh 3 ossm-2/openshift-golang-builder-container Red Hat Power monitoring for Red Hat OpenShift openshift-power-monitoring/kepler-rhel9
    affected: workaround, no fix available
  • Red Hat build of Apicurio Registry 2 apicurio/apicurio-registry-rhel8-operator, apicurio/apicurio-registry-rhel9-operator
    affected: workaround, no fix planned “Will not fix”
  • Red Hat Ceph Storage 5 rhceph/snmp-notifier-rhel8 Red Hat Ceph Storage 6 rhceph/snmp-notifier-rhel9 Red Hat Ceph Storage 9 rhceph/alloy-rhel10
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Certification Program for Red Hat Enterprise Linux 9 redhat-certification-preflight Red Hat Connectivity Link 1 rhcl-1/rhcl-operator-bundle
    affected: workaround, no fix available
  • Red Hat Enterprise Linux 9 rhc, runc, butane, skopeo, buildah, grafana, +12 more Red Hat Enterprise Linux 10 rhc, delve, trustee, go-fdo-client, go-fdo-server, gvisor-tap-vsock, +4 more
    affected: workaround, no fix available, no fix planned “Will not fix”
  • Red Hat Enterprise Linux AI (RHEL AI) 3 golang
    affected: workaround, no fix available
  • Red Hat OpenShift AI (RHOAI) rhoai/rhai-cli-rhel9, rhoai/odh-maas-api-rhel9, rhoai/odh-kube-auth-proxy-rhel9, rhoai/odh-model-serving-api-rhel9, rhoai/odh-codeflare-operator-rhel9, rhoai/odh-ml-pipelines-driver-rhel9, +9 more
    affected: workaround, no fix available “Fix deferred”
  • Red Hat OpenShift Cluster Manager CLI ocm-cli-clients/ocm-cli-rhel9 Red Hat OpenShift Container Platform 4 openshift4/ose-node, openshift4/ose-sdn-rhel7, openshift4/ose-kube-rbac-proxy-rhel9, ossm-2/openshift-golang-builder-container Red Hat OpenShift Container Platform 5 openshift5/ose-kube-rbac-proxy-rhel9 Red Hat OpenShift Dev Spaces devspaces/udi-rhel9 Red Hat OpenShift Dev Workspaces Operator devworkspace/devworkspace-rhel9-operator Red Hat OpenShift distributed tracing 3 rhosdt/tempo-rhel9
    affected: workaround, no fix available

12 more affected, 107 more fixed, 107 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
yes
Technical impact
partial
Assessed
6 mo ago

Exploit prediction

0.88% chance of exploitation in the next 30 days, higher than 59% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
OSV 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
bitnami golang
<1.25.10
>=1.26.0-0, <1.26.3
1.25.10
1.26.3
go stdlib
<1.25.10
>=1.26.0-0, <1.26.3
1.25.10
1.26.3

Affected products

  • Go standard library net
  • Red Hat Cryostat 4 on RHEL 9
  • Red Hat Red Hat Ansible Automation Platform 2.5 for RHEL 8
  • Red Hat Red Hat Ansible Automation Platform 2.5 for RHEL 9
  • Red Hat Red Hat Ansible Automation Platform 2.6 for RHEL 10
  • Red Hat Red Hat Ansible Automation Platform 2.6 for RHEL 9
  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support
  • Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support
  • Red Hat Red Hat OpenShift Container Platform 4.14
  • Red Hat Red Hat OpenShift Container Platform 4.15
  • Red Hat Red Hat OpenShift Container Platform 4.16
  • Red Hat Red Hat OpenShift Container Platform 4.17
  • Red Hat Red Hat OpenShift Container Platform 4.18
  • Red Hat Red Hat OpenShift Container Platform 4.19
  • Red Hat Red Hat OpenStack Platform 16.2
  • Red Hat Red Hat OpenStack Services on OpenShift 18.0
  • Red Hat Red Hat Satellite 6.16 for RHEL 8
  • Red Hat Red Hat Satellite 6.16 for RHEL 9
  • Red Hat Red Hat Satellite 6.17 for RHEL 9
  • Red Hat Red Hat Satellite 6.18 for RHEL 9
  • Red Hat Red Hat Satellite 6.19 for RHEL 9
  • Red Hat RHEM 1.0 for RHEL 9
  • Red Hat RHEM 1.1 for RHEL 10
  • Red Hat RHEM 1.1 for RHEL 9
  • Red Hat Streams for Apache Kafka 3.2.1
  • Red Hat Compliance Operator 1
  • Red Hat Logging for Red Hat OpenShift 6
  • Red Hat Logging for Red Hat OpenShift 6.2
  • Red Hat Logging Subsystem for Red Hat OpenShift 6.4
  • Red Hat Logging Subsystem for Red Hat OpenShift 6.5
  • Red Hat multicluster engine for Kubernetes 2.1
  • Red Hat multicluster engine for Kubernetes 2.11
  • Red Hat multicluster engine for Kubernetes 2.6
  • Red Hat multicluster engine for Kubernetes 2.8
  • Red Hat multicluster engine for Kubernetes 2.9
  • Red Hat Multicluster Global Hub 1.4.5
  • Red Hat Multicluster Global Hub 1.6.5
  • Red Hat Multicluster Global Hub 1.7.0
  • Red Hat OpenShift API for Data Protection 1.3
  • Red Hat OpenShift API for Data Protection 1.4
  • Red Hat OpenShift API for Data Protection 1.5
  • Red Hat OpenShift API for Data Protection 1.6
  • Red Hat OpenShift Developer Tools and Services 1.6.3
  • Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.16

Classification

Weakness
  • CWE-1341 Multiple Releases of Same Resource or Handle
  • CWE-415 Double Free

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.