CVE-2026-39835
highpriority · track · 0EPSS 0.005 · 43 %ileDEEUFRRUUSEPSS · scored 2026-10-27
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.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5.3–7.5
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (97)
Products and version ranges known to be affected.
- Red Hat Enterprise Linux Advanced Cluster Management for Kubernetesall versionscert_bundDEcpe:/o:redhat:enterprise_linux:advanced_cluster_management_for_kubernetes
- Red Hat Enterprise Linux Advanced Cluster Securityall versionscert_bundDEcpe:/o:redhat:enterprise_linux:advanced_cluster_security
- Red Hat Enterprise Linux Edge Managerall versionscert_bundDEcpe:/o:redhat:enterprise_linux:edge_manager
- Red Hat Enterprise Linux Multicluster Engine for Kubernetesall versionscert_bundDEcpe:/o:redhat:enterprise_linux:multicluster_engine_for_kubernetes
- Red Hat OpenShift API for Data Protectionall versionscert_bundDEcpe:/a:redhat:openshift:api_for_data_protection
- Red Hat OpenShift Container Platformall versionscert_bundDEcpe:/a:redhat:openshift:container_platform
- Red Hat OpenShift Container Platform 4.22.4all versionscert_bundDEcpe:/a:redhat:openshift:container_platform_4.22.4
- Red Hat OpenShift Migration Toolkit for Applicationsall versionscert_bundDEcpe:/a:redhat:openshift:migration_toolkit_for_applications
advisories (4)
Vendor and ecosystem advisories describing this.
- WID-SEC-W-2026-1653Golang Go-Module (Net, Image, Crypto: Mehrere SchwachstellenDeutsch2026-05-21csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in Golang Go ausnutzen, um erweiterte Privilegien zu erlangen, Cross-Site-Scripting-Angriffe durchzuführen, Sicherheitsmaßnahmen zu umgehen oder einen Denial-of-Service-Zustand zu verursachen.
- GHSA-78mq-xcr3-xm33golang.org/x/crypto is vulnerable to invoking server panic during CheckHostKey/Authenticate flow2026-06-25ghsa · osvUS
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.
- CERTFR-2026-AVI-1385Multiples vulnérabilités dans les produits VMwareFrançais2026-10-26vendor · certfrFR
- GO-2026-5015Invoking server panic during CheckHostKey/Authenticate in golang.org/x/crypto/ssh2026-05-22vendor · osvUS
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.
also known as (6)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (69)
External citations — patches, advisories, analysis.
- https://go.dev/cl/781660cnnvd
- https://go.dev/doc/installPatchcnnvd
- https://go.dev/issue/79563cnnvd
- https://groups.google.com/g/golang-announce/c/a082jnz-LvIcnnvd
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-39835cnnvd
- https://pkg.go.dev/vuln/GO-2026-5015cnnvd
- https://go.dev/cl/781660enisa_euvd
- https://go.dev/issue/79563enisa_euvd
Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.
Free scan