CVE-2026-56862
highpriority · track · 0EPSS 0.006 · 47 %ileDEEUFRUSEPSS · scored 2026-10-27
Handshake messages, such as KeyUpdate, are always considered as state-advancing, regardless of whether a handshake has been completed or not. As a result, a malicious client can keep sending KeyUpdate messages to force the server to keep performing key derivation operations indefinitely.
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 · 6.9–7.5
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (23)
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 Migration Toolkit for Applicationsall versionscert_bundDEcpe:/o:redhat:enterprise_linux:migration_toolkit_for_applications_6.2.0
- Red Hat OpenShift Container Platformall versionscert_bundDEcpe:/a:redhat:openshift:container_platform
advisories (4)
Vendor and ecosystem advisories describing this.
- WID-SEC-W-2026-2850Golang Go: Mehrere SchwachstellenDeutsch2026-08-13csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in Golang Go ausnutzen, um einen Denial of Service zu verursachen, ein Cross Site Scripting durchzuführen, Sicherheitsmaßnahmen zu umgehen oder Daten zu manipulieren.
- BIT-golang-2026-56862Limit handshake messages we are willing to accept post-handshake in crypto/tls2026-08-19vendor · osvUS
Handshake messages, such as KeyUpdate, are always considered as state-advancing, regardless of whether a handshake has been completed or not. As a result, a malicious client can keep sending KeyUpdate messages to force the server to keep performing key derivation operations indefinitely.
- CERTFR-2026-AVI-1385Multiples vulnérabilités dans les produits VMwareFrançais2026-10-26vendor · certfrFR
- GO-2026-6090Limit handshake messages we are willing to accept post-handshake in crypto/tls2026-08-13vendor · osvUS
Handshake messages, such as KeyUpdate, are always considered as state-advancing, regardless of whether a handshake has been completed or not. As a result, a malicious client can keep sending KeyUpdate messages to force the server to keep performing key derivation operations indefinitely.
also known as (5)
Other names and identifiers for this entity.
- CNNVD-2026-91780147cnnvd
- EUVD-2026-58511enisa_euvd
- GHSA-7qch-w8m5-g3h3enisa_euvd
- BIT-golang-2026-56862osv
- GO-2026-6090osv
sources
Which sources assert this record, and when.
references (12)
External citations — patches, advisories, analysis.
- https://go.dev/cl/804261cnnvd
- https://go.dev/issue/80528cnnvd
- https://groups.google.com/g/golang-announce/c/94pEornpRlIcnnvd
- https://pkg.go.dev/vuln/GO-2026-6090cnnvd
- https://go.dev/cl/804261enisa_euvd
- https://go.dev/issue/80528enisa_euvd
- https://groups.google.com/g/golang-announce/c/94pEornpRlIenisa_euvd
- https://pkg.go.dev/vuln/GO-2026-6090enisa_euvd
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