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Fencer Vulns
high 7.5

CVE-2026-27141 json

Sending certain HTTP/2 frames can cause a server to panic in golang.org/x/net

published 2026-02-26 8 mo ago modified 2026-06-17 4 mo ago also EUVD-2026-8880 , GO-2026-4559

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 47%
public exploits
0
none known

Summary

Due to missing nil check, sending 0x0a-0x0f HTTP/2 frames will cause a running server to panic

Patch / fix

  • go golang.org/x/net 0.51.0
  • golang.org/x/net golang.org/x/net/http2 0.51.0
  • adsys Ubuntu 26.04 LTS 0.16.4ubuntu1.1

ubuntu advisories UBUNTU-CVE-2026-27141

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • 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-2026:7385RHSA-2026:7291

  • govulncheck-vulndb openSUSE Leap 15.6 0.0.20260226T182644-150000.1.149.1

suse advisories SUSE-SU-2026:0757-1

  • govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1
  • rclone openSUSE Leap 16.0 1.74.4-bp160.1.1
  • traefik openSUSE Tumbleweed 3.6.10-2.1
  • rclone openSUSE Tumbleweed 1.73.2-1.1
  • telemetrygen openSUSE Tumbleweed 0.147.0-1.1

opensuse advisories openSUSE-SU-2026:21483-1openSUSE-SU-2026:21436-1openSUSE-SU-2026:10385-1openSUSE-SU-2026:10313-1openSUSE-SU-2026:10294-1

  • rclone Alpine 3.24 1.73.5-r0

alpine advisories ALPINE-CVE-2026-27141

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

  • azurelinux-image-tools Azure Linux 3.0 1.2.0-2
  • ignition-flatcar Azure Linux 3.0 2.22.0-2

azure linux advisories AZL-78680AZL-84807

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

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-2026-27141 updated cvss 5.3

golang.org/x/net/http2: golang.org/x/net/http2: Denial of Service due to malformed HTTP/2 frames

  • Red Hat Enterprise Linux 9 rhel9/bootc-image-builder Red Hat Enterprise Linux 10 rhel10/bootc-image-builder
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Assisted Installer for Red Hat OpenShift Container Platform 2 rhai/assisted-installer-rhel9 Red Hat Builds for Red Hat OpenShift openshift-builds/openshift-builds-waiters-rhel9 Red Hat cert-manager Operator for Red Hat OpenShift cert-manager/jetstack-cert-manager-rhel9 Red Hat Compliance Operator compliance/openshift-compliance-operator-bundle Red Hat Confidential Compute Attestation build-of-trustee/trustee-rhel9-operator, openshift-sandboxed-containers/osc-monitor-rhel9 Red Hat Cryostat 4 cryostat/cryostat-storage-rhel9
    +32 more products
    Red Hat Custom Metric Autoscaler operator for Red Hat Openshift custom-metrics-autoscaler/custom-metrics-autoscaler-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 ExternalDNS Operator edo/external-dns-rhel8, edo/external-dns-rhel9 Red Hat Fence Agents Remediation Operator workload-availability/fence-agents-remediation-rhel8-operator Red Hat File Integrity Operator compliance/openshift-compliance-operator-bundle Red Hat Gatekeeper 3 gatekeeper/gatekeeper-rhel9-operator Red Hat Logging Subsystem for Red Hat OpenShift openshift-logging/eventrouter-rhel9, openshift-logging/logging-loki-rhel9 Red Hat Logical Volume Manager Storage lvms4/topolvm-rhel8, lvms4/topolvm-rhel9, lvms4/lvms-rhel9-operator Red Hat Machine Deletion Remediation Operator workload-availability/machine-deletion-remediation-rhel8-operator Red Hat Migration Toolkit for Applications 8 mta/mta-cli-rhel9 Red Hat Migration Toolkit for Containers rhmtc/openshift-migration-controller-rhel8 Red Hat Multicluster Engine for Kubernetes multicluster-engine/discovery-rhel9 Red Hat Multicluster Global Hub multicluster-globalhub/multicluster-globalhub-agent-rhel9 Red Hat Network Observability Operator network-observability/network-observability-cli-rhel9 Red Hat Node HealthCheck Operator workload-availability/node-healthcheck-rhel8-operator Red Hat OpenShift API for Data Protection oadp/oadp-velero-rhel9 Red Hat OpenShift Developer Tools and Services ocp-tools-4/jenkins-agent-base-rhel9 Red Hat OpenShift Lightspeed openshift-lightspeed/lightspeed-rhel9-operator Red Hat OpenShift Pipelines openshift-pipelines-client Red Hat OpenShift Serverless kn-workflow-plugin, openshift-serverless-clients, openshift-serverless-1/kn-plugin-event-sender-rhel9 Red Hat OpenShift Service Mesh 2 openshift-service-mesh/openshift-golang-builder Red Hat OpenShift Service Mesh 3 openshift-service-mesh/kiali-rhel9, openshift-service-mesh/openshift-golang-builder Red Hat Power monitoring for Red Hat OpenShift openshift-power-monitoring/kepler-rhel9 Red Hat 3scale API Management Platform 2 3scale-amp26/operator, 3scale-amp26/3scale-operator, 3scale-amp2/3scale-rhel7-operator, 3scale-amp2/3scale-rhel9-operator Red Hat Advanced Cluster Management for Kubernetes 2 rhacm2/subctl-rhel9 Red Hat Advanced Cluster Security 4 advanced-cluster-security/rhacs-main-rhel8 Red Hat Ansible Automation Platform 2 receptor, automation-gateway-proxy, ansible-automation-platform-26/receptor-rhel9, ansible-automation-platform/platform-operator-bundle Red Hat build of Apache Camel - HawtIO 4 hawtio-operator-container Red Hat Certification Program for Red Hat Enterprise Linux 9 redhat-certification-preflight Red Hat Connectivity Link 1 rhcl-1/coredns-rhel9 Red Hat Developer Hub 1 rhdh/rhdh-rhel9-operator
    under investigation

28 more under investigation, 6 more fixed, 3 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
8 mo ago

Exploit prediction

0.57% chance of exploitation in the next 30 days, higher than 47% 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
CNA 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
go golang.org/x/net
>=0.50.0, <0.51.0
0.51.0

Affected products

  • golang.org/x/net golang.org/x/net/http2

Classification

Weakness

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.