SSH Agent Constraint-Serialization Bug (v<0.52.0)
CVE-2026-39832 Published on May 22, 2026

Invoking agent constraints dropped when forwarding keys in golang.org/x/crypto/ssh/agent
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.

NVD

Vulnerability Analysis

CVE-2026-39832 is exploitable with network access, requires user interaction and a small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality and integrity, and no impact on availability.

Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
LOW
User Interaction:
REQUIRED
Scope:
CHANGED
Confidentiality Impact:
HIGH
Integrity Impact:
HIGH
Availability Impact:
NONE

Weakness Type

Improper Preservation of Permissions

The software does not preserve permissions or incorrectly preserves permissions when copying, restoring, or sharing objects, which can cause them to have less restrictive permissions than intended.


Products Associated with CVE-2026-39832

You can be notified by email with stack.watch whenever vulnerabilities like CVE-2026-39832 are published in these products:

Canonical Ubuntu Linux
 
Red Hat Assisted Installer
 
Red Hat Openshift Builds
 
Red Hat External Secrets Operator
 
Red Hat Multicluster Engine
 
Red Hat Openshift Pipelines
 
Red Hat Serverless
 
Red Hat Acm
 
Red Hat Advanced Cluster Security
 
Red Hat Ceph Storage
 
Red Hat Edge Manager
 
Red Hat Enterprise Linux (RHEL)
 
Red Hat Openshift Ai
 
Red Hat Openshift
 
Red Hat Openshift Data Foundation
 
Red Hat Devworkspace
 
Red Hat Openshift Gitops
 
Red Hat Container Native Virtualization
 
Red Hat Openstack
 
Red Hat Quay
 
Red Hat Trusted Artifact Signer
 

Affected Versions

golang.org/x/crypto/ssh/agent: Assisted Installer for Red Hat OpenShift Container Platform 2: Builds for Red Hat OpenShift: External Secrets Operator for Red Hat OpenShift: Red Hat Multicluster Engine for Kubernetes: Red Hat OpenShift Pipelines: Red Hat OpenShift Serverless: Red Hat Advanced Cluster Management for Kubernetes 2: Red Hat Advanced Cluster Security 4: Red Hat Ceph Storage 9: Red Hat Edge Manager 1: Red Hat Enterprise Linux 10: Red Hat Enterprise Linux 8: Red Hat Enterprise Linux 9: Red Hat OpenShift AI (RHOAI): Red Hat OpenShift Container Platform 4: Red Hat Openshift Data Foundation 4: Red Hat OpenShift Dev Workspaces Operator: Red Hat OpenShift GitOps: Red Hat OpenShift Virtualization 4: Red Hat OpenStack Platform 16.2: Red Hat OpenStack Platform 18.0: Red Hat Quay 3: Red Hat Trusted Artifact Signer: Red Hat OpenStack Platform 17.1:

Exploit Probability

EPSS
0.33%
Percentile
24.56%

EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.