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Fencer Vulns
high 7.5

CVE-2026-39835 json

Invoking server panic during CheckHostKey/Authenticate in golang.org/x/crypto/ssh

published 2026-05-22 5 mo ago modified 2026-09-22 48 d ago also EUVD-2026-31393 , GHSA-78mq-xcr3-xm33 , GO-2026-5015

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 43%
public exploits
0
none known

Summary

SSH servers which use CertChecker as a public key callback without setting IsUserAuthority or IsHostAuthority could be caused to panic by a client presenting a certificate. CertChecker now returns an error instead of panicking when these callbacks are nil.

Patch / fix

  • go golang.org/x/crypto 0.52.0
  • golang.org/x/crypto golang.org/x/crypto/ssh 0.52.0
  • Red Hat Cryostat 4 on RHEL 9 4.2.0-19
  • Red Hat Red Hat Enterprise Linux 10 2:1.43.1-3.el10_2, 7:5.8.2-4.el10_2
  • Red Hat Red Hat Enterprise Linux 8 8100020260709093628.afee755d
  • Red Hat Red Hat Enterprise Linux 9 2:1.43.1-3.el9_8, 6:5.8.2-4.el9_8
  • Red Hat Red Hat OpenShift Container Platform 4.22 0:4.22.0-202608010430.p2.g5f1e0e7.assembly.stream.el8, 1785884688
  • Red Hat RHEM 1.0 for RHEL 9 0:1.0.3-1.el9em
  • Red Hat RHEM 1.1 for RHEL 10 0:1.1.3-1.el10em
  • Red Hat RHEM 1.1 for RHEL 9 0:1.1.3-1.el9em
  • Red Hat external secrets operator for Red Hat OpenShift 1.1 1786614676
  • Red Hat Logging Subsystem for Red Hat OpenShift 6.6 1788439505
  • Red Hat multicluster engine for Kubernetes 2.1 1784564438
  • Red Hat multicluster engine for Kubernetes 2.11 1786912006
  • Red Hat multicluster engine for Kubernetes 2.17 1786637185
  • Red Hat multicluster engine for Kubernetes 2.6 1784158679
  • Red Hat multicluster engine for Kubernetes 2.8 1784738758
  • Red Hat OpenShift API for Data Protection 1.3 1785177359, 1785177438, 1785180878
  • Red Hat OpenShift API for Data Protection 1.4 1786944540, 1786946190, 1786946294
  • Red Hat OpenShift API for Data Protection 1.5 1788859896, 1788860461
  • Red Hat OpenShift API for Data Protection 1.6 1784058822
  • Red Hat Red Hat Advanced Cluster Security 4.9 1781686446, 1782891812
  • Red Hat Red Hat Advanced Cluster Security for Kubernetes 4.10 1781686458, 1782891789
  • Red Hat Red Hat Advanced Cluster Security for Kubernetes 4.11 1782925137, 1783352589
  • Red Hat Red Hat Edge Manager 1.0 1783502022, 1783502023, 1783502025, 1783502029, 1783502401, 1783502403, 1783502445, 1783502465, 1783502494
  • Red Hat Red Hat Edge Manager 1.1 1784126762, 1784126774, 1784126780, 1784126832, 1784127762, 1784127787, 1784127791, 1784128388, 1784128860, 1784194144, 1784194188, 1784194309, 1784194347, 1784194353, 1784194638, 1784194653, 1784194971, 1784194980, 1784195620, 1784196588
  • Red Hat Red Hat OpenShift AI 2.25 1788181054, 1788181065
  • Red Hat Red Hat OpenShift AI 3.4 1787001948, 1787002529
  • Red Hat Red Hat OpenShift Builds 1.7.3 1783057515, 1783057529, 1783057868, 1783057884, 1783058067, 1783058284
  • Red Hat Red Hat OpenShift Builds 1.8.1 1783611805, 1783611973, 1783612119, 1783612163, 1783612432, 1783612714, 1784121108
  • golang-go.crypto Debian 14 1:0.52.0-1

debian advisories DEBIAN-CVE-2026-39835

  • golang1.27 hummingbird 1 1.27.1-0.1.hum1
  • golang1.27-bin hummingbird 1 1.27.1-0.1.hum1
  • golang1.27-src hummingbird 1 1.27.1-0.1.hum1
  • golang1.27-misc hummingbird 1 1.27.1-0.1.hum1
  • golang1.27-tests hummingbird 1 1.27.1-0.1.hum1
  • golang1.26 hummingbird 1 1.26.8-0.1.hum1
  • golang1.26-bin hummingbird 1 1.26.8-0.1.hum1
  • golang1.26-src hummingbird 1 1.26.8-0.1.hum1

red hat advisories RHSA-2026:66561RHSA-2026:62391RHSA-2026:51036RHSA-2026:41019RHSA-2026:38504RHSA-2026:37410

  • distribution SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES for SAP 15 SP4 +8 more 3.1.1-150400.9.41.1
  • containerized-data-importer SLE Module for Containers 15 SP7 1.64.0-150700.9.14.1
  • kubevirt SLE Module for Containers 15 SP7 1.7.4-150700.3.30.1
  • terraform-provider-aws SLE Module for Public Cloud 15 SP5, SLE Module for Public Cloud 15 SP4 3.11.0-150200.6.18.1
  • terraform-provider-tls SLE Module for Public Cloud 15 SP5, SLE Module for Public Cloud 15 SP4 3.0.0-150200.5.15.1
  • terraform-provider-helm SLE Module for Public Cloud 15 SP5, SLE Module for Public Cloud 15 SP4 2.9.0-150200.6.23.1
  • terraform-provider-null SLE Module for Public Cloud 15 SP5, SLE Module for Public Cloud 15 SP4 3.0.0-150200.6.18.1
  • terraform-provider-local SLE Module for Public Cloud 15 SP5, SLE Module for Public Cloud 15 SP4 2.0.0-150200.6.17.1

suse advisories SUSE-SU-2026:4212-1SUSE-SU-2026:4209-1SUSE-SU-2026:3203-1SUSE-SU-2026:3056-1SUSE-SU-2026:22613-1SUSE-SU-2026:2827-1

  • percona-toolkit openSUSE Tumbleweed 3.7.1.4-1.1
  • cloudflared openSUSE Leap 16.0 2026.9.1-bp160.1.1
  • kit openSUSE Tumbleweed 0.107.0-1.1
  • containerized-data-importer1.65 openSUSE Leap 16.0 1.65.0-160000.3.1
  • glab openSUSE Leap 16.0 1.114.0-bp160.1.1
  • kubevirt1.8 openSUSE Leap 16.0 1.8.4-160000.1.1
  • govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1
  • rclone openSUSE Leap 16.0 1.74.4-bp160.1.1

opensuse advisories openSUSE-SU-2026:12166-1openSUSE-SU-2026:21924-1openSUSE-SU-2026:11806-1openSUSE-SU-2026:21824-1openSUSE-SU-2026:21662-1openSUSE-SU-2026:21590-1

  • 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
  • criu AlmaLinux 8 3.18-5.module_el8.10.0+4089+ce72bbbe
  • criu AlmaLinux 8 3.18-5.module_el8.10.0+4120+03ad4b47
  • criu AlmaLinux 8 3.18-5.module_el8.10.0+3876+e55593a8
  • criu AlmaLinux 8 3.18-5.module_el8.10.0+3909+6e1c1eb7

almalinux advisories ALSA-2026:38504ALSA-2026:37123ALSA-2026:37410ALSA-2026:36199

  • criu Rocky Linux 8 3.18-5.module+el8.10.0+1880+8e896d1b
  • criu Rocky Linux 8 3.18-5.module+el8.10.0+1874+ce489889
  • criu Rocky Linux 8 3.18-5.module+el8.10.0+1948+4b5cd4a9
  • criu Rocky Linux 8 3.18-5.module+el8.10.0+40047+0c0a73f4
  • criu Rocky Linux 8 3.18-5.module+el8.10.0+1843+6892ab28
  • criu Rocky Linux 8 3.18-5.module+el8.10.0+1872+2e18eb19
  • criu Rocky Linux 8 3.18-5.module+el8.10.0+2001+6a33db9f
  • criu Rocky Linux 8 3.18-5.module+el8.10.0+40133+32c21f88

rocky linux advisories RLSA-2026:38504RLSA-2026:37072RLSA-2026:37123RLSA-2026:37410RLSA-2026:36199

  • cert-manager Azure Linux 3.0 1.12.15-9
  • cf-cli Azure Linux 3.0 8.7.11-7
  • docker-buildx Azure Linux 3.0 0.14.0-15
  • docker-compose Azure Linux 3.0 2.27.0-12
  • gh Azure Linux 3.0 2.62.0-17
  • kubernetes Azure Linux 3.0 1.30.10-25
  • kubevirt Azure Linux 3.0 1.7.1-7
  • moby-engine Azure Linux 3.0 25.0.3-18

azure linux advisories AZL-87417AZL-87465AZL-87627AZL-87702AZL-87768AZL-87912

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-2026-39835 updated cvss 7.5

golang.org/x/crypto/ssh: golang: golang.org/x/crypto/ssh: Denial of Service via crafted SSH certificate

  • Red Hat Assisted Installer for Red Hat OpenShift Container Platform 2 assisted/agent-preinstall-image-builder-rhel9
    affected: workaround, no fix available
  • Red Hat Confidential Compute Attestation openshift-sandboxed-containers/osc-rhel9-operator, openshift-sandboxed-containers/osc-podvm-payload-rhel9, openshift-sandboxed-containers/osc-cloud-api-adaptor-rhel9
    affected: workaround, no fix planned “Will not fix”
  • Red Hat Multicluster Engine for Kubernetes multicluster-engine/assisted-service-8-rhel8, multicluster-engine/assisted-service-9-rhel9, multicluster-engine/azure-service-operator-rhel9, multicluster-engine/cluster-api-provider-azure-rhel9, multicluster-engine/cluster-api-provider-kubevirt-rhel9 Red Hat OpenShift Pipelines openshift-pipelines-client, openshift-pipelines/pipelines-results-api-rhel9, openshift-pipelines/pipelines-results-watcher-rhel9, openshift-pipelines/pipelines-chains-controller-rhel9, openshift-pipelines/pipelines-pipelines-as-code-watcher-rhel9, openshift-pipelines/pipelines-pipelines-as-code-controller-rhel9 Red Hat OpenShift Serverless openshift-serverless-clients, openshift-serverless-1/kn-plugin-func-func-util-rhel9 Red Hat Advanced Cluster Management for Kubernetes 2 rhacm2/multicluster-operators-subscription-rhel9 Red Hat Enterprise Linux 9 gvisor-tap-vsock, gvisor-tap-vsock-gvforwarder Red Hat Enterprise Linux 10 gvisor-tap-vsock
    affected: workaround, no fix available
  • Red Hat Hardened Images golang1.25
    affected: workaround, no fix planned “Will not fix”
  • Red Hat OpenShift AI (RHOAI) rhoai/odh-trainer-rhel9
    affected: workaround, no fix available
  • Red Hat OpenShift Container Platform 4 podman, microshift, podman-tests, podman-docker, podman-remote, microshift-olm, +32 more Red Hat OpenShift Container Platform 5 microshift, openshift5/ose-dpu-cni-rhel9, openshift5/ose-hyperkube-rhel9, openshift5/ose-dpu-daemon-rhel9, openshift5/ose-kube-proxy-rhel9, openshift5/ose-dpu-rhel9-operator, +11 more
    affected: workaround, no fix available, no fix planned “Will not fix”
  • Red Hat OpenShift Dev Workspaces Operator devworkspace/devworkspace-rhel9-operator, devworkspace/devworkspace-project-clone-rhel9 Red Hat OpenShift for Windows Containers openshift4-wincw/windows-machine-config-rhel9-operator, openshift4-wincw/windows-machine-config-operator-bundle Red Hat OpenShift on AWS rosa Red Hat OpenShift Virtualization 4 kubevirt Red Hat Quay 3 quay/quay-builder-rhel8, quay/quay-builder-rhel9 Red Hat Trusted Artifact Signer rhtas/ec-rhel9, rhtas/rhtas-console-rhel9, rhtas/policy-controller-rhel9, rhtas/model-transparency-cli-rhel9, rhtas/model-validation-agent-rhel9
    affected: workaround, no fix available
  • Red Hat Zero Trust Workload Identity Manager zero-trust-workload-identity-manager/spiffe-spire-agent-rhel9, zero-trust-workload-identity-manager/spiffe-spire-server-rhel9, zero-trust-workload-identity-manager/spiffe-spire-oidc-discovery-provider-rhel9 Red Hat Zero Trust Workload Identity Manager - Tech Preview zero-trust-workload-identity-manager/spiffe-spire-agent-rhel9, zero-trust-workload-identity-manager/spiffe-spire-server-rhel9, zero-trust-workload-identity-manager/spiffe-spire-oidc-discovery-provider-rhel9
    affected: workaround, no fix planned “Will not fix”
show 20 more
  • Red Hat Cert Manager support for Red Hat OpenShift release 1.17 cert-manager/cert-manager-operator-rhel9 1791788287, cert-manager/jetstack-cert-manager-rhel9 1791371069, cert-manager/jetstack-cert-manager-acmesolver-rhel9 1791371080
    fixed: vendor fix RHSA-2026:82322
  • Red Hat Cryostat 4 on RHEL 9 cryostat/cryostat-storage-rhel9 4.2.0-19
    fixed: vendor fix RHSA-2026:48151
  • Red Hat external secrets operator for Red Hat OpenShift 1.1 external-secrets-operator/external-secrets-rhel9 1786614676
    fixed: vendor fix RHSA-2026:54525
  • Red Hat Logging Subsystem for Red Hat OpenShift 6.6 openshift-logging/cluster-logging-rhel9-operator 1788439505
    fixed: vendor fix RHSA-2026:66521
  • Red Hat multicluster engine for Kubernetes 2.6 multicluster-engine/cluster-image-set-controller-rhel9 1784158679
    fixed: vendor fix RHSA-2026:47949
  • Red Hat multicluster engine for Kubernetes 2.8 multicluster-engine/hypershift-addon-rhel9-operator 1784738758
    fixed: vendor fix RHSA-2026:47735
  • Red Hat multicluster engine for Kubernetes 2.10 multicluster-engine/hypershift-addon-rhel9-operator 1784564438
    fixed: vendor fix RHSA-2026:46885
  • Red Hat multicluster engine for Kubernetes 2.11 multicluster-engine/hypershift-addon-rhel9-operator 1786912006
    fixed: vendor fix RHSA-2026:57194
  • Red Hat multicluster engine for Kubernetes 2.17 multicluster-engine/hypershift-addon-rhel9-operator 1786637185
    fixed: vendor fix RHSA-2026:59593
  • Red Hat OpenShift API for Data Protection 1.3 oadp/oadp-velero-rhel9 1785180878, oadp/oadp-mustgather-rhel9 1785177359, oadp/oadp-velero-restic-restore-helper-rhel9 1785177438
    fixed: vendor fix RHSA-2026:51033
  • Red Hat OpenShift API for Data Protection 1.4 oadp/oadp-velero-rhel9 1786944540, oadp/oadp-mustgather-rhel9 1786946294, oadp/oadp-velero-restic-restore-helper-rhel9 1786946190
    fixed: vendor fix RHSA-2026:59467
  • Red Hat OpenShift API for Data Protection 1.5 oadp/oadp-velero-rhel9 1788860461, oadp/oadp-mustgather-rhel9 1788859896
    fixed: vendor fix RHSA-2026:66022
  • Red Hat OpenShift API for Data Protection 1.6 oadp/oadp-velero-rhel9 1784058822
    fixed: vendor fix RHSA-2026:43692
  • Red Hat OpenShift Security Profiles Operator 1 compliance/openshift-security-profiles-rhel8-operator 1790623030, compliance/openshift-security-profiles-operator-bundle 1790626888
    fixed: vendor fix RHSA-2026:76752
  • Red Hat Advanced Cluster Security 4.9 advanced-cluster-security/rhacs-main-rhel8 1781686446, advanced-cluster-security/rhacs-roxctl-rhel8 1781686446, advanced-cluster-security/rhacs-scanner-rhel8 1782891812, advanced-cluster-security/rhacs-rhel8-operator 1781686446, advanced-cluster-security/rhacs-scanner-v4-rhel8 1781686446, advanced-cluster-security/rhacs-scanner-slim-rhel8 1782891812
    fixed: vendor fix RHSA-2026:26546
  • Red Hat Advanced Cluster Security for Kubernetes 4.11 advanced-cluster-security/rhacs-main-rhel9 1783352589, advanced-cluster-security/rhacs-roxctl-rhel9 1783352589, advanced-cluster-security/rhacs-scanner-rhel9 1782925137, advanced-cluster-security/rhacs-rhel9-operator 1783352589, advanced-cluster-security/rhacs-operator-bundle 1783352589, advanced-cluster-security/rhacs-scanner-v4-rhel9 1783352589, +1 more
    fixed: vendor fix RHSA-2026:36207
  • Red Hat Advanced Cluster Security for Kubernetes for IBM Power, little endian 4.10 advanced-cluster-security/rhacs-main-rhel8 1781686458, advanced-cluster-security/rhacs-roxctl-rhel8 1781686458, advanced-cluster-security/rhacs-scanner-rhel8 1782891789, advanced-cluster-security/rhacs-rhel8-operator 1781686458, advanced-cluster-security/rhacs-scanner-v4-rhel8 1781686458, advanced-cluster-security/rhacs-scanner-slim-rhel8 1782891789
    fixed: vendor fix RHSA-2026:26547
  • Red Hat Edge Manager 1.0 rhem/flightctl-api-rhel9 1783502025, rhem/flightctl-worker-rhel9 1783502445, rhem/flightctl-db-setup-rhel9 1783502401, rhem/flightctl-periodic-rhel9 1783502022, rhem/flightctl-pam-issuer-rhel9 1783502403, rhem/flightctl-cli-artifacts-rhel9 1783502494, +4 more
    fixed: vendor fix RHSA-2026:36651
  • Red Hat Edge Manager 1.1 rhem/flightctl-api-rhel9 1784126780, rhem/flightctl-api-rhel10 1784196588, rhem/flightctl-worker-rhel9 1784127775, rhem/flightctl-worker-rhel10 1784194971, rhem/flightctl-db-setup-rhel9 1784126762, rhem/flightctl-periodic-rhel9 1784127791, +18 more
    fixed: vendor fix RHSA-2026:40945
  • Red Hat Enterprise Linux AppStream (v. 8) crit 3.18-5.module+el8.10.0+24510+6ea3880e, criu 3.18-5.module+el8.10.0+24510+6ea3880e, runc 1.2.9-4.module+el8.10.0+24510+6ea3880e, crun 1.14.3-2.module+el8.10.0+24510+6ea3880e, udica 0.2.6-21.module+el8.10.0+24510+6ea3880e, conmon 2.1.10-1.module+el8.10.0+24510+6ea3880e, +27 more
    fixed: vendor fix RHSA-2026:38504

28 more fixed, 51 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
no
Technical impact
partial
Assessed
5 mo ago

Exploit prediction

0.50% chance of exploitation in the next 30 days, higher than 43% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
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
GitHub 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CNA 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
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/crypto
<0.52.0
0.52.0

Affected products

  • golang.org/x/crypto golang.org/x/crypto/ssh
  • Red Hat Cryostat 4 on RHEL 9
  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat OpenShift Container Platform 4.22
  • 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 external secrets operator for Red Hat OpenShift 1.1
  • Red Hat Logging Subsystem for Red Hat OpenShift 6.6
  • Red Hat multicluster engine for Kubernetes 2.1
  • Red Hat multicluster engine for Kubernetes 2.11
  • Red Hat multicluster engine for Kubernetes 2.17
  • Red Hat multicluster engine for Kubernetes 2.6
  • Red Hat multicluster engine for Kubernetes 2.8
  • 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 Red Hat Advanced Cluster Security 4.9
  • Red Hat Red Hat Advanced Cluster Security for Kubernetes 4.10
  • Red Hat Red Hat Advanced Cluster Security for Kubernetes 4.11
  • Red Hat Red Hat Edge Manager 1.0
  • Red Hat Red Hat Edge Manager 1.1
  • Red Hat Red Hat OpenShift AI 2.25
  • Red Hat Red Hat OpenShift AI 3.4
  • Red Hat Red Hat OpenShift Builds 1.7.3
  • Red Hat Red Hat OpenShift Builds 1.8.1
  • Red Hat Red Hat Openshift Data Foundation 4.22
  • Red Hat Red Hat OpenShift Dev Spaces 3.30
  • Red Hat Red Hat OpenShift GitOps 1.19
  • Red Hat Red Hat OpenShift GitOps 1.20
  • Red Hat Red Hat Quay 3.10
  • Red Hat Red Hat Quay 3.12
  • Red Hat Red Hat Quay 3.15
  • Red Hat Red Hat Quay 3.16
  • Red Hat Red Hat Quay 3.9
  • Red Hat Red Hat Trusted Artifact Signer 1.3
  • Red Hat Red Hat Trusted Artifact Signer 1.4
  • Red Hat Assisted Installer for Red Hat OpenShift Container Platform 2
  • Red Hat cert-manager Operator for Red Hat OpenShift
  • Red Hat Confidential Compute Attestation
  • Red Hat ExternalDNS Operator
  • Red Hat Multicluster Engine for Kubernetes
  • Red Hat OpenShift Pipelines
  • Red Hat OpenShift Serverless
  • Red Hat Red Hat Advanced Cluster Management for Kubernetes 2
  • Red Hat Red Hat Hardened Images
  • Red Hat Red Hat OpenShift AI (RHOAI)

Classification

Weakness
  • CWE-476 NULL Pointer Dereference
  • CWE-295 Improper Certificate Validation

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.