CVE-2025-61727: Improper application of excluded DNS name constraints when verifying wildcard names in crypto/x509

Patch / fix

fixed in 3 distros 4 links 1

bitnami golang 1.24.11, 1.25.5
go stdlib 1.24.11, 1.25.5
Go standard library crypto/x509 1.24.11, 1.25.5

red hat suse opensuse alpine

golang1.25 hummingbird 1 1.25.9-1.hum1
golang1.25-bin hummingbird 1 1.25.9-1.hum1
golang1.25-src hummingbird 1 1.25.9-1.hum1
golang1.25-misc hummingbird 1 1.25.9-1.hum1
golang1.25-tests hummingbird 1 1.25.9-1.hum1
golang1.25-shared hummingbird 1 1.25.9-1.hum1
golang1.26 hummingbird 1 1.26.2-1.hum1
golang1.26-bin hummingbird 1 1.26.2-1.hum1

red hat advisories RHSA-2026:7385 RHSA-2026:7291 RHSA-2026:7070

go1.24-openssl SLES for SAP applications 16.0, SLES 16.0 1.24.13-160000.1.1
go1.25-openssl SLES for SAP applications 16.0, SLES 16.0 1.25.7-160000.1.1
go1.24-openssl SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Development Tools 15 SP7 +1 more 1.24.12-150600.13.15.1
go1.25-openssl SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Development Tools 15 SP7 +1 more 1.25.6-150600.13.9.1
go1.25-openssl SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +5 more 1.25.6-150000.1.9.1
go1.24-openssl SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +5 more 1.24.12-150000.1.18.1
govulncheck-vulndb SLE Module for Package Hub 15 SP6, openSUSE Leap 15.6 0.0.20251209T172047-150000.1.127.1
go1.24 SLES for SAP applications 16.0, SLES 16.0 1.24.11-160000.1.1

suse advisories SUSE-SU-2026:20629-1 SUSE-SU-2026:20623-1 SUSE-SU-2026:0308-1 SUSE-SU-2026:0298-1 SUSE-SU-2026:0297-1 SUSE-SU-2026:0296-1

govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1
go1.24-openssl openSUSE Leap 16.0 1.24.13-160000.1.1
go1.25-openssl openSUSE Leap 16.0 1.25.7-160000.1.1
kubelogin openSUSE Tumbleweed 0.2.14-1.1
go1.24 openSUSE Leap 16.0 1.24.11-160000.1.1
go1.25 openSUSE Leap 16.0 1.25.5-160000.1.1
buildpacks-cli openSUSE Tumbleweed 0.39.1-1.1
regclient openSUSE Tumbleweed 0.11.1-1.1

opensuse advisories openSUSE-SU-2026:21483-1 openSUSE-SU-2026:20308-1 openSUSE-SU-2026:20301-1 openSUSE-SU-2026:10031-1 openSUSE-SU-2025:20158-1 openSUSE-SU-2025:20157-1

go Alpine 3.22 1.24.11-r0
go Alpine 3.24, Alpine 3.23 1.25.5-r0
docker Alpine 3.24, Alpine 3.23 29.1.2-r0

alpine advisories ALPINE-CVE-2025-61727

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

go.dev/cl/723900 patch

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-2025-61727 updated 2026-11-07 cvss 6.5

golang: crypto/x509: excluded subdomain constraint does not restrict wildcard SANs

Red Hat Assisted Installer for Red Hat OpenShift Container Platform 2 rhai/assisted-installer-rhel9, rhai/assisted-installer-agent-rhel9, rhai/assisted-installer-controller-rhel9 Red Hat Builds for Red Hat OpenShift openshift-builds/openshift-builds-waiters-rhel9, openshift-builds/openshift-builds-webhook-rhel9, openshift-builds/openshift-builds-rhel9-operator, openshift-builds/openshift-builds-controller-rhel9, openshift-builds/openshift-builds-git-cloner-rhel9, openshift-builds/openshift-builds-image-bundler-rhel9, +3 more Red Hat cert-manager Operator for Red Hat OpenShift cert-manager/cert-manager-istio-csr-rhel9 Red Hat Compliance Operator compliance/openshift-compliance-operator-bundle Red Hat Confidential Compute Attestation confidential-compute-attestation-tech-preview/trustee-rhel9-operator Red Hat Cryostat 4 cryostat/cryostat-storage-rhel9, cryostat/cryostat-rhel9-operator, cryostat/cryostat-ose-oauth-proxy-rhel9, cryostat/cryostat-grafana-dashboard-rhel9

+34 more productsfewer

Red Hat Custom Metric Autoscaler operator for Red Hat Openshift custom-metrics-autoscaler/custom-metrics-autoscaler-rhel9, custom-metrics-autoscaler/custom-metrics-autoscaler-adapter-rhel9, custom-metrics-autoscaler/custom-metrics-autoscaler-rhel9-operator, custom-metrics-autoscaler/custom-metrics-autoscaler-admission-webhooks-rhel9 Red Hat Deployment Validation Operator dvo/deployment-validation-rhel8-operator Red Hat External Secrets Operator for Red Hat OpenShift external-secrets-operator/external-secrets-rhel9 Red Hat external secrets operator for Red Hat OpenShift - Tech Preview external-secrets-operator/external-secrets-rhel9 Red Hat Fence Agents Remediation Operator workload-availability/fence-agents-remediation-rhel8-operator, workload-availability/fence-agents-remediation-operator-bundle Red Hat File Integrity Operator compliance/openshift-compliance-operator-bundle, compliance/openshift-file-integrity-rhel8-operator, compliance/openshift-file-integrity-operator-bundle Red Hat Gatekeeper 3 gatekeeper/gatekeeper-rhel9-operator 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/eventrouter-rhel8, openshift-logging/eventrouter-rhel9, openshift-logging/logging-loki-rhel9, openshift-logging/loki-rhel9-operator, openshift-logging/opa-openshift-rhel9, openshift-logging/lokistack-gateway-rhel9, +5 more Red Hat Logical Volume Manager Storage lvms4/topolvm-rhel8, lvms4/topolvm-rhel9, lvms4/lvms-rhel9-operator, lvms4/lvms-operator-bundle, lvms4/lvms-must-gather-rhel8, lvms4/lvms-must-gather-rhel9 Red Hat Machine Deletion Remediation Operator workload-availability/machine-deletion-remediation-rhel8-operator, workload-availability/machine-deletion-remediation-operator-bundle Red Hat Migration Toolkit for Applications 7 mta/mta-cli-rhel9, mta/mta-hub-rhel9, mta/mta-analyzer-addon-rhel9, mta/mta-discovery-addon-rhel9, mta/mta-java-external-provider-rhel9, mta/mta-dotnet-external-provider-rhel8, +2 more Red Hat Migration Toolkit for Applications 8 mta/mta-cli-rhel9, mta/mta-hub-rhel9, mta/mta-analyzer-addon-rhel9, mta/mta-platform-addon-rhel9, mta/mta-discovery-addon-rhel9, mta/mta-solution-server-rhel9, +4 more Red Hat Migration Toolkit for Containers rhmtc/openshift-migration-registry-rhel8, rhmtc/openshift-migration-controller-rhel8, rhmtc/openshift-migration-must-gather-rhel8, rhmtc/openshift-migration-rsync-transfer-rhel8, rhmtc/openshift-migration-velero-plugin-for-mtc-rhel8 Red Hat Migration Toolkit for Virtualization migration-toolkit-virtualization/mtv-api-rhel9, migration-toolkit-virtualization/mtv-rhel8-operator, migration-toolkit-virtualization/mtv-rhel9-operator, migration-toolkit-virtualization/mtv-virt-v2v-rhel9, migration-toolkit-virtualization/mtv-controller-rhel9, migration-toolkit-virtualization/mtv-validation-rhel9, +6 more Red Hat mirror registry for Red Hat OpenShift openshift/mirror-registry-rhel8 Red Hat mirror registry for Red Hat OpenShift 2 openshift/mirror-registry-rhel8 Red Hat Multiarch Tuning Operator multiarch-tuning/multiarch-tuning-rhel9-operator Red Hat Multicluster Engine for Kubernetes multicluster-engine/hive-rhel8, multicluster-engine/hive-rhel9, multicluster-engine/work-rhel8, multicluster-engine/work-rhel9, multicluster-engine/discovery-rhel8, multicluster-engine/discovery-rhel9, +59 more 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, multicluster-globalhub/multicluster-globalhub-operator-bundle, multicluster-globalhub/multicluster-globalhub-postgres-exporter-rhel9, +1 more Red Hat Network Observability Operator network-observability/network-observability-cli-rhel9, network-observability/network-observability-rhel9-operator, network-observability/network-observability-ebpf-agent-rhel9, network-observability/network-observability-flowlogs-pipeline-rhel9 Red Hat Node HealthCheck Operator workload-availability/node-healthcheck-rhel8-operator, workload-availability/node-healthcheck-operator-bundle Red Hat Node Maintenance Operator workload-availability/node-maintenance-rhel8-operator, workload-availability/node-maintenance-operator-bundle, container-native-virtualization/node-maintenance-operator Red Hat OpenShift API for Data Protection oadp/oadp-velero-rhel8, oadp/oadp-velero-rhel9, oadp/oadp-rhel8-operator, oadp/oadp-rhel9-operator, oadp/oadp-non-admin-rhel9, oadp/oadp-mustgather-rhel8, +16 more Red Hat OpenShift Developer Tools and Services openshift4/ose-jenkins, ocp-tools-4/jenkins-rhel8, ocp-tools-4/jenkins-rhel9, ocp-tools-4/jenkins-agent-base-rhel9 Red Hat OpenShift Lightspeed openshift-lightspeed/lightspeed-rhel9-operator, openshift-lightspeed/lightspeed-operator-bundle, openshift-lightspeed/openshift-mcp-server-rhel9, openshift-lightspeed-tech-preview/lightspeed-operator-bundle 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-rhel9-operator Red Hat OpenShift Secondary Scheduler Operator openshift-secondary-scheduler-operator/secondary-scheduler-rhel9-operator Red Hat OpenShift Serverless openshift-serverless-clients, openshift-serverless-1/kn-plugin-event-sender-rhel9, openshift-serverless-1-logic-rhel9-operator-container, openshift-serverless-1/kn-plugin-func-func-util-rhel9, openshift-serverless-1/kn-backstage-plugins-eventmesh-rhel9 Red Hat OpenShift Service Mesh 3 openshift-service-mesh/kiali-rhel9, openshift-service-mesh/istio-cni-rhel9, openshift-service-mesh/istio-pilot-rhel9, openshift-service-mesh/istio-proxyv2-rhel9, openshift-service-mesh/istio-rhel9-operator Red Hat OpenShift Source-to-Image (S2I) source-to-image/source-to-image-rhel8 Red Hat Power monitoring for Red Hat OpenShift openshift-power-monitoring/kepler-rhel9, openshift-power-monitoring/power-monitoring-rhel9-operator Red Hat 3scale API Management Platform 2 3scale-amp26/operator, 3scale-amp26/3scale-operator, 3scale-amp2/3scale-rhel7-operator, 3scale-amp2/3scale-rhel9-operator, 3scale-amp2/3scale-operator-bundle, 3scale-amp2/apicast-rhel7-operator, +2 more

affected: workaround, no fix available “Fix deferred”

41 more affected, 2 more fixed, 2 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: 11 mo ago (2025-12-03)

Exploit prediction

0.30% chance of exploitation in the next 30 days, higher than 23% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CISA ADP	3.1	6.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
CNA	3.1	6.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
OSV	3.1	6.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Affected packages

ecosystem	package	affected	fixed in
bitnami	golang	<1.24.11 >=1.25.0, <1.25.5	1.24.11 1.25.5
go	stdlib	<1.24.11 >=1.25.0, <1.25.5	1.24.11 1.25.5

Affected products

Go standard library crypto/x509

Classification

Weakness

CWE-295 Improper Certificate Validation

References

go.dev /cl/723900
patch
pkg.go.dev /vuln/GO-2025-4175
vendor-advisory, advisory
go.dev /issue/76442
issue-tracking, report
groups.google.com /g/golang-announce/c/8FJoBkPddm4
mailing-list, release-notes, discussion, web
nvd.nist.gov /vuln/detail/CVE-2025-61727
web

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.

Summary