Panic in Dial and LookupPort when handling NUL byte on Windows in net
Priority MEDIUM 40CWE-476Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Partial Red Hat: 16 fixed, 39 without a fix
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat. Impact type from CWE-476.
Summary
The Dial and LookupPort functions panic on Windows when provided with an input containing a NUL (0).
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00633 50th percentileScored 2026-11-07
Fix Partial net (Go standard library): 1.25.10, 1.26.3Red Hat: 17 advisoriesRed Hat: 16 fixed, 39 without a fix
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Go standard library | net | before 1.25.10; 1.26.0-0 to before 1.26.3 | 1.25.10, 1.26.3 | Patch available | CNA |
- net VendorGo standard library Affected before 1.25.10; 1.26.0-0 to before 1.26.3 Fixed in 1.25.10, 1.26.3 Patch available CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:golang:go:*:*:*:*:*:*:*:* | before 1.25.10; 1.26.0 to before 1.26.3 | Vulnerable | Go standard library |
- cpe:2.3:a:golang:go:*:*:*:*:*:*:*:* Versions before 1.25.10; 1.26.0 to before 1.26.3 Vulnerable ·Go standard library
Remediation
- Fix · CNA net (Go standard library) Fixed in 1.25.10, 1.26.3
Red Hat 17 advisories
- RHSA-2026:91249 Released 2026-10-27 · Red Hat rating CriticalRed Hat AI Base Images 3.5.5 (Neuron)
- Red Hat OpenShift AI 3.5 registry.redhat.io/rhai/base-image-neuron-rhel9
- RHSA-2026:91248 Released 2026-10-27 · Red Hat rating CriticalRed Hat AI Base Images 3.4.6 (Neuron)
- Red Hat OpenShift AI 3.4 registry.redhat.io/rhai/base-image-neuron-rhel9
- RHSA-2026:87120 Released 2026-10-21 · Red Hat rating CriticalRed Hat Ansible Automation Platform 2.6 Container Release Update
- Red Hat Ansible Automation Platform 2.6 registry.redhat.io/ansible-automation-platform-26/eda-controller-rhel9, registry.redhat.io/ansible-automation-platform-26/ee-supported-rhel9, registry.redhat.io/ansible-automation-platform-26/gateway-rhel9 +8
Show 14 more Red Hat advisories
- RHSA-2026:57194 Released 2026-08-19 · Red Hat rating Importantmulticluster engine for Kubernetes v2.11.5 security update
- multicluster engine for Kubernetes 2.11 registry.redhat.io/multicluster-engine/addon-manager-rhel9, registry.redhat.io/multicluster-engine/backplane-rhel9-operator, registry.redhat.io/multicluster-engine/cluster-api-provider-kubevirt-rhel9 +11
- RHSA-2026:55903 Released 2026-08-18 · Red Hat rating ImportantRed Hat Web Terminal Operator 1.14.0 release.
- Red Hat Web Terminal 1.14 registry.redhat.io/web-terminal/web-terminal-exec-rhel9
- RHSA-2026:55902 Released 2026-08-18 · Red Hat rating ImportantRed Hat Web Terminal Operator 1.13.0 release.
- Red Hat Web Terminal 1.13 registry.redhat.io/web-terminal/web-terminal-exec-rhel9
- RHSA-2026:55901 Released 2026-08-18 · Red Hat rating ImportantRed Hat Web Terminal Operator 1.11.1 release.
- Red Hat Web Terminal 1.11 registry.redhat.io/web-terminal/web-terminal-exec-rhel9
- RHSA-2026:55900 Released 2026-08-18 · Red Hat rating ImportantRed Hat Web Terminal Operator 1.15.1 release.
- Red Hat Web Terminal 1.15 registry.redhat.io/web-terminal/web-terminal-exec-rhel9
- RHSA-2026:55899 Released 2026-08-18 · Red Hat rating ImportantRed Hat Web Terminal Operator 1.16.1 release.
- Red Hat Web Terminal 1.16 registry.redhat.io/web-terminal/web-terminal-exec-rhel9
- RHSA-2026:55898 Released 2026-08-18 · Red Hat rating ImportantRed Hat Web Terminal Operator 1.12.1 release.
- Red Hat Web Terminal 1.12 registry.redhat.io/web-terminal/web-terminal-exec-rhel9
- RHSA-2026:52857 Released 2026-08-10 · Red Hat rating ImportantRed Hat OpenShift GitOps v1.19.6 security update
- Red Hat OpenShift GitOps 1.19 registry.redhat.io/openshift-gitops-1/argocd-rhel8, registry.redhat.io/openshift-gitops-1/dex-rhel8, registry.redhat.io/openshift-gitops-1/gitops-rhel8-operator
- RHSA-2026:36625 Released 2026-07-08 · Red Hat rating ImportantRHACS 4.10.5 security and bug fix update
- Red Hat Advanced Cluster Security for Kubernetes for IBM Power, little endian 4.10 registry.redhat.io/advanced-cluster-security/rhacs-main-rhel8, registry.redhat.io/advanced-cluster-security/rhacs-rhel8-operator, registry.redhat.io/advanced-cluster-security/rhacs-roxctl-rhel8 +3
- RHSA-2026:23264 Released 2026-06-04 · Red Hat rating ImportantRed Hat Hardened Images RPMs bug fix and enhancement update
- Red Hat Hardened Images golang1.26-1.26.4-2.hum1@aarch64, golang1.26-1.26.4-2.hum1@src, golang1.26-1.26.4-2.hum1@x86_64 +10
- RHSA-2026:23262 Released 2026-06-04 · Red Hat rating ImportantRed Hat Hardened Images RPMs bug fix and enhancement update
- Red Hat Hardened Images golang1.25-1.25.11-2.hum1@aarch64, golang1.25-1.25.11-2.hum1@src, golang1.25-1.25.11-2.hum1@x86_64 +10
- RHSA-2026:22112 Released 2026-06-01 · Red Hat rating Importantgo-toolset:rhel8 security update
- Red Hat Enterprise Linux AppStream (v. 8) delve-1.25.2-1.module+el8.10.0+23746+9db33b5e.aarch64::go-toolset:rhel8, delve-1.25.2-1.module+el8.10.0+23746+9db33b5e.ppc64le::go-toolset:rhel8, delve-1.25.2-1.module+el8.10.0+23746+9db33b5e.src::go-toolset:rhel8 +22
- RHSA-2026:22121 Released 2026-06-01 · Red Hat rating Importantgolang security update
- Red Hat Enterprise Linux AppStream (v. 9) go-toolset-1.26.3-1.el9_8, golang-1.26.3-1.el9_8, golang-bin-1.26.3-1.el9_8 +5
- RHSA-2026:22120 Released 2026-06-01 · Red Hat rating Importantgolang security update
- Red Hat Enterprise Linux AppStream (v. 10) go-toolset-1.26.3-4.el10_2, golang-1.26.3-4.el10_2, golang-bin-1.26.3-4.el10_2 +5
Fixed in the same release
Records fixed by the same vendor advisory or release, as the CNA lists them.
- Release ·
Go standard library net 1.25.10, 1.26.3
2 records Highest priority Priority MEDIUM 2 MEDIUM
Other records, highest priority first
- TI-2026-26183 Crash when handling long CNAME response in netPriority MEDIUM 40
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Builds for Red Hat OpenShift | Affected | No fix yet |
| Confidential Compute Attestation | Affected | No fix yet |
| Cryostat 4 | Affected | No fix yet |
| Custom Metric Autoscaler operator for Red Hat Openshift | Affected | No fix yet |
| Deployment Validation Operator | Affected | No fix yet |
| External Secrets Operator for Red Hat OpenShift | Affected | No fix yet |
| Migration Toolkit for Applications 8 | Affected | No fix yet |
| Multicluster Engine for Kubernetes | Affected | No fix yet |
| Multicluster Global Hub | Affected | No fix yet |
| Network Observability Operator | Affected | No fix yet |
| OpenShift API for Data Protection | Affected | No fix yet |
| OpenShift Lightspeed | Affected | No fix planned: Will not fix |
| OpenShift Pipelines | Affected | No fix yet |
| OpenShift Service Mesh 2 | Affected | No fix yet |
| Power monitoring for Red Hat OpenShift | Affected | No fix yet |
| Red Hat 3scale API Management Platform 2 | Affected | No fix planned: Will not fix |
| Red Hat AMQ Clients | Affected | No fix yet |
| Red Hat Advanced Cluster Management for Kubernetes 2 | Affected | No fix yet |
| Red Hat Ansible Automation Platform 2 | Affected | No fix yet |
| Red Hat Ceph Storage 5 | Affected | No fix yet |
| Red Hat Ceph Storage 6 | Affected | No fix yet |
| Red Hat Ceph Storage 9 | Affected | No fix yet |
| Red Hat Certification Program for Red Hat Enterprise Linux 9 | Affected | No fix yet |
| Red Hat Edge Manager 1 | Affected | No fix planned: Will not fix |
| Red Hat Enterprise Linux 10 | Affected | No fix yet |
| Red Hat Enterprise Linux 7 | Affected | No fix yet |
| Red Hat Enterprise Linux 9 | Affected | No fix yet |
| Red Hat Enterprise Linux AI (RHEL AI) 3 | Affected | No fix yet |
| Red Hat Lightspeed for Runtimes Operator | Affected | No fix yet |
| Red Hat OpenShift AI (RHOAI) | Affected | No fix yet |
| Red Hat OpenShift Dev Spaces | Affected | No fix yet |
| Red Hat OpenShift Dev Workspaces Operator | Affected | No fix yet |
| Red Hat OpenShift GitOps | Affected | No fix yet |
| Red Hat OpenShift distributed tracing 3 | Affected | No fix yet |
| Red Hat Service Interconnect 1 | Affected | No fix yet |
| Red Hat Trusted Artifact Signer | Affected | No fix yet |
| Red Hat build of Apicurio Registry 2 | Affected | No fix yet |
| cert-manager Operator for Red Hat OpenShift | Affected | No fix yet |
| mirror registry for Red Hat OpenShift | Affected | No fix yet |
| Red Hat Advanced Cluster Security for Kubernetes for IBM Power, little endian 4.10 | Fixed | RHSA-2026:36625 |
| Red Hat Ansible Automation Platform 2.6 | Fixed | RHSA-2026:87120 |
| Red Hat Enterprise Linux AppStream (v. 10) | Fixed | RHSA-2026:22120 |
| Red Hat Enterprise Linux AppStream (v. 8) | Fixed | RHSA-2026:22112 |
| Red Hat Enterprise Linux AppStream (v. 9) | Fixed | RHSA-2026:22121 |
| Red Hat Hardened Images | Fixed | RHSA-2026:23262, RHSA-2026:23264 |
| Red Hat OpenShift AI 3.4 | Fixed | RHSA-2026:91248 |
| Red Hat OpenShift AI 3.5 | Fixed | RHSA-2026:91249 |
| Red Hat OpenShift GitOps 1.19 | Fixed | RHSA-2026:52857 |
| Red Hat Web Terminal 1.11 | Fixed | RHSA-2026:55901 |
| Red Hat Web Terminal 1.12 | Fixed | RHSA-2026:55898 |
| Red Hat Web Terminal 1.13 | Fixed | RHSA-2026:55902 |
| Red Hat Web Terminal 1.14 | Fixed | RHSA-2026:55903 |
| Red Hat Web Terminal 1.15 | Fixed | RHSA-2026:55900 |
| Red Hat Web Terminal 1.16 | Fixed | RHSA-2026:55899 |
| multicluster engine for Kubernetes 2.11 | Fixed | RHSA-2026:57194 |
Not affected: 57 products
- Assisted Installer for Red Hat OpenShift Container Platform 2
- Compliance Operator
- Fence Agents Remediation Operator
- File Integrity Operator
- Gatekeeper 3
- Logging Subsystem for Red Hat OpenShift
- Logical Volume Manager Storage
- Machine Deletion Remediation Operator
- Migration Toolkit for Containers
- Multiarch Tuning Operator
- Multicluster Engine for Kubernetes
- Multicluster Global Hub
- Node HealthCheck Operator
- OpenShift Developer Tools and Services
- OpenShift Serverless
- OpenShift Service Mesh 3
- OpenShift Source-to-Image (S2I)
- Red Hat 3scale API Management Platform 2
- Red Hat AMQ Clients
- Red Hat Advanced Cluster Management for Kubernetes 2
- Red Hat Advanced Cluster Security for Kubernetes for IBM Power, little endian 4.10
- Red Hat Ansible Automation Platform 2
- Red Hat Ansible Automation Platform 2.6
- Red Hat Connectivity Link 1
- Red Hat Developer Hub 1
- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat OpenShift AI (RHOAI)
- Red Hat OpenShift Cluster Manager CLI
- Red Hat OpenShift Container Platform 4
- Red Hat OpenShift GitOps
- Red Hat OpenShift GitOps 1.19
- Red Hat OpenShift Virtualization 4
- Red Hat OpenShift for Windows Containers
- Red Hat OpenShift on AWS
- Red Hat OpenStack Platform 16.2
- Red Hat OpenStack Platform 17.1
- Red Hat OpenStack Platform 18.0
- Red Hat Openshift Data Foundation 4
- Red Hat Quay 3
- Red Hat Satellite 6
- Red Hat Service Interconnect 2
- Red Hat Web Terminal 1.11
- Red Hat Web Terminal 1.12
- Red Hat Web Terminal 1.13
- Red Hat Web Terminal 1.14
- Red Hat Web Terminal 1.15
- Red Hat Web Terminal 1.16
- Security Profiles Operator
- Service Telemetry Framework 1.5
- Zero Trust Workload Identity Manager
- Zero Trust Workload Identity Manager - Tech Preview
- mirror registry for Red Hat OpenShift 2
- multicluster engine for Kubernetes 2.11
- streams for Apache Kafka 3
Timeline
- 2026-10-02 Threatist record created from CVE-2026-39836
- 2026-10-03 Alias added: GHSA-8g2r-hhvj-mv99
- 2026-10-16 Affected versions changed · Red Hat
- 2026-10-18 Affected versions changed · Red Hat
- 2026-10-20 Fix available: RHSA-2026:36625 · Red Hat
- 2026-10-21 Fix available: Red Hat Advanced Cluster Security for Kubernetes 4.10 · Red Hat
- 2026-10-22 Fix available: RHSA-2026:87120 · Red Hat
- 2026-10-22 Fix available: Red Hat Ansible Automation Platform 2.6 · Red Hat
- 2026-10-23 Affected versions changed · Red Hat
- 2026-10-25 EPSS moved to the 50th–90th percentile
- 2026-10-27 Affected versions changed · Red Hat
- 2026-10-30 Fix available: RHSA-2026:91248 · Red Hat
- 2026-10-30 Fix available: RHSA-2026:91249 · Red Hat
- 2026-10-30 Fix available: Red Hat OpenShift AI 3.4, Red Hat OpenShift AI 3.5 · Red Hat
- 2026-10-31 Affected versions changed · Red Hat
- 2026-11-05 Fix available: Red Hat Advanced Cluster Security for Kubernetes for IBM Power, little endian 4.10 · Red Hat
- 2026-11-07 Affected versions changed · Red Hat
References
More Go standard library Go vulnerabilities
- TI-2020-00578 Improper certificate validation in Microsoft Windows KEVCVSS 3.1HIGH 8.1
- TI-2023-23979 The HTTP/2 protocol allows a denial of service (server resource consumption) because… KEVCVSS 3.1HIGH 7.5
- TI-2018-05208 The "go get" implementation in Go 1.9.4, when the -insecure command-line option is used… CVSS 3.1HIGH 8.8
- TI-2018-12083 Improper input validation in [UNKNOWN] golang CVSS 3.1HIGH 8.1
- TI-2024-16306 Mishandling of corrupt central directory record in archive/zip CVSS 3.1MEDIUM 5.5
- TI-2021-15910 Go before 1.16.9 and 1.17.x before 1.17.2 has a Buffer Overflow via large arguments in a… CVSS 3.1CRITICAL 9.8
Sources
- CVE-2026-39836 · CVE Program
- CVE-2026-39836 · NVD
- FIRST EPSS
- GHSA-8g2r-hhvj-mv99 · GitHub Advisory Database · CC BY 4.0
- CVE-2026-39836 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences