CVE-2026-54745
Description
A flaw was found in Kubeflow Pipelines. An unauthenticated attacker can exploit a Server-Side Request Forgery (SSRF) and HTTP smuggling vulnerability through the /_proxy/ route. This allows the attacker to bypass authorization and forward arbitrary requests to internal services. Consequently, this can expose sensitive cloud metadata credentials, Kubernetes or service APIs, and other cluster-internal endpoints to unauthorized read or modification.
Statement
This Critical vulnerability in Kubeflow Pipelines allows unauthenticated attackers to exploit a Server-Side Request Forgery (SSRF) and HTTP smuggling flaw via the /_proxy/ route. This bypasses authorization, enabling access to internal cluster services and potentially exposing sensitive cloud metadata credentials, Kubernetes APIs, or other internal endpoints for unauthorized data exfiltration or modification. The unauthenticated nature and broad impact on internal services elevate the risk in exposed deployments.
Mitigation
To mitigate this vulnerability, restrict network access to the Kubeflow Pipelines frontend to trusted internal networks. Implement firewall rules or network access control lists to prevent external or untrusted access to the ports exposed by the Kubeflow Pipelines service. This action reduces the attack surface by ensuring that only authorized internal systems can reach the vulnerable `/_proxy/` route, thereby limiting the potential for unauthenticated Server-Side Request Forgery and HTTP smuggling attacks. This mitigation may impact legitimate external users who require access to the Kubeflow Pipelines frontend.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 10 | N/A | 10 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | None | N/A | None |
| User Interaction | None | N/A | None |
| Scope | Changed | N/A | Changed |
| Confidentiality | High | N/A | High |
| Integrity Impact | High | N/A | High |
| Availability Impact | High | N/A | High |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Understanding the Weakness (CWE)
Confidentiality
Technical Impact: Read Application Data
Integrity
Technical Impact: Execute Unauthorized Code or Commands
Access Control
Technical Impact: Bypass Protection Mechanism
By providing URLs to unexpected hosts or ports, attackers can make it appear that the server is sending the request, possibly bypassing access controls such as firewalls that prevent the attackers from accessing the URLs directly. The server can be used as a proxy to conduct port scanning of hosts in internal networks, use other URLs such as that can access documents on the system (using file://), or use other protocols such as gopher:// or tftp://, which may provide greater control over the contents of requests.
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