Undici v7.23.08.1.0: Cross-Origin Request Leak via Socks5ProxyAgent
CVE-2026-6734 Published on June 17, 2026

undici vulnerable to cross-origin request routing via SOCKS5 proxy pool reuse
Impact: When using Socks5ProxyAgent, undici reuses a single connection pool across different origins without verifying that the pool's origin matches the requested origin. All requests are dispatched through the pool connected to the first origin, regardless of the intended destination. This causes cross-origin request routing: credentials and request data intended for origin B are sent to origin A, responses from the wrong origin are trusted, and HTTPS requests may be silently downgraded to HTTP. Impacted users are applications that use Socks5ProxyAgent (directly or via setGlobalDispatcher) and make requests to more than one origin. This was introduced in undici 7.23.0 via PR #4385 and affects all versions through 8.1.0. Patches: Upgrade to undici v7.26.0 or v8.2.0. Workarounds: Use a separate Socks5ProxyAgent instance per origin, or avoid using Socks5ProxyAgent with multiple origins.

NVD

Vulnerability Analysis

CVE-2026-6734 is exploitable with network access, and requires small amount of user privileges. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to be very high.

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

Weakness Types

Origin Validation Error

The software does not properly verify that the source of data or communication is valid.

Improper Verification of Source of a Communication Channel

The software establishes a communication channel to handle an incoming request that has been initiated by an actor, but it does not properly verify that the request is coming from the expected origin. When an attacker can successfully establish a communication channel from an untrusted origin, the attacker may be able to gain privileges and access unexpected functionality.


Products Associated with CVE-2026-6734

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Red Hat Hummingbird
 
Red Hat Cryostat
 
Red Hat Openshift Pipelines
 
Red Hat Podman Desktop
 
Red Hat Rhdh
 
Red Hat Enterprise Linux (RHEL)
 
Red Hat Openshift Ai
 
Red Hat Openshift
 
Red Hat Openshift Data Foundation
 
Red Hat Openshift Devspaces
 
Red Hat Ansible Portal
 
Red Hat Amq Broker
 
Red Hat Cluster Observability Operator
 

Affected Versions

undici: Red Hat Cryostat 4 on RHEL 9: Red Hat Enterprise Linux 10: Red Hat Enterprise Linux 8: Red Hat Enterprise Linux 9: Red Hat Cluster Observability Operator 1.5.0: Red Hat Cluster Observability Operator 1.5.0: Red Hat Cluster Observability Operator 1.5.0: Red Hat Cluster Observability Operator 1.5.0: Red Hat Cluster Observability Operator 1.5.0: Red Hat Cluster Observability Operator 1.5.0: Red Hat Cluster Observability Operator 1.5.0: Red Hat Cluster Observability Operator 1.5.0: Red Hat Cluster Observability Operator 1.5.0: Red Hat Developer Hub 1.10: Red Hat Developer Hub 1.9: Red Hat Hardened Images: Red Hat Hardened Images: Red Hat Hardened Images: Red Hat Hardened Images: Red Hat OpenShift Dev Spaces 3.29: Red Hat OpenShift Dev Spaces 3.29: Red Hat OpenShift Dev Spaces 3.29: Red Hat OpenShift Dev Spaces 3.29: Red Hat Cryostat 4: Red Hat Cryostat 4: Red Hat OpenShift Pipelines: Red Hat OpenShift Pipelines: Red Hat OpenShift Pipelines: Red Hat AMQ Broker 7: Red Hat Build of Podman Desktop: Red Hat Enterprise Linux 10: Red Hat Enterprise Linux 8: Red Hat Enterprise Linux 9: Red Hat OpenShift AI (RHOAI): Red Hat OpenShift AI (RHOAI): Red Hat OpenShift AI (RHOAI): Red Hat OpenShift AI (RHOAI): Red Hat OpenShift AI (RHOAI): Red Hat OpenShift AI (RHOAI): Red Hat OpenShift AI (RHOAI): Red Hat OpenShift AI (RHOAI): Red Hat OpenShift AI (RHOAI): Red Hat OpenShift Container Platform 4: Red Hat OpenShift Container Platform 4: Red Hat OpenShift Container Platform 4: Red Hat Openshift Data Foundation 4: Red Hat Openshift Data Foundation 4: Red Hat Openshift Data Foundation 4: Red Hat Self-service automation portal 2: Red Hat Self-service automation portal 2:

Exploit Probability

EPSS
0.15%
Percentile
4.28%

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.