CVE-2026-39832
criticalpriority · track · 0EPSS 0.007 · 52 %ileDEEUFRRUUSEPSS · scored 2026-10-27
When adding a key to a remote agent constraint extensions such as restrict-destination-v00@openssh.com were not serialized in the request. Destination restrictions were silently stripped when forwarding keys, allowing unrestricted use of the key on the remote host. The client now serializes all constraint extensions. Additionally, the in-memory keyring returned by NewKeyring() now rejects keys with unsupported constraint extensions instead of silently ignoring them.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · high–critical · 8.7–9.1
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (63)
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 (5)
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-f5wc-c3c7-36mcgolang.org/x/crypto doesn't drop invoking agent constraints when forwarding keys2026-06-25ghsa · osvUS
When adding a key to a remote agent constraint extensions such as restrict-destination-v00@openssh.com were not serialized in the request. Destination restrictions were silently stripped when forwarding keys, allowing unrestricted use of the key on the remote host. The client now serializes all constraint extensions. Additionally, the in-memory keyring returned by NewKeyring() now rejects keys with unsupported constraint extensions instead of silently ignoring them.
- CERTFR-2026-AVI-1366Multiples vulnérabilités dans les produits SplunkFrançais2026-10-22vendor · certfrFR
- CERTFR-2026-AVI-1385Multiples vulnérabilités dans les produits VMwareFrançais2026-10-26vendor · certfrFR
- GO-2026-5006Invoking agent constraints dropped when forwarding keys in golang.org/x/crypto/ssh/agent2026-05-22vendor · osvUS
When adding a key to a remote agent constraint extensions such as restrict-destination-v00@openssh.com were not serialized in the request. Destination restrictions were silently stripped when forwarding keys, allowing unrestricted use of the key on the remote host. The client now serializes all constraint extensions. Additionally, the in-memory keyring returned by NewKeyring() now rejects keys with unsupported constraint extensions instead of silently ignoring them.
also known as (6)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (51)
External citations — patches, advisories, analysis.
- https://go.dev/cl/778642cnnvd
- https://go.dev/doc/installPatchcnnvd
- https://go.dev/issue/79435cnnvd
- https://groups.google.com/g/golang-announce/c/a082jnz-LvIcnnvd
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-39832cnnvd
- https://pkg.go.dev/vuln/GO-2026-5006cnnvd
- https://go.dev/cl/778640enisa_euvd
- https://go.dev/cl/778641enisa_euvd
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