Description
Warpgate is an open source SSH, HTTPS, and MySQL bastion host for Linux. Prior to 0.29.0, the Kubernetes protocol listener uses AcceptAnyClientCert in warpgate-protocol-kubernetes/src/server/client_certs.rs to accept certificates at the TLS layer and defer validation to warpgate-protocol-kubernetes/src/server/auth.rs, where authentication and lookup failures are rendered verbatim in an HTTP 500 response body. The Kubernetes application in warpgate-protocol-kubernetes/src/server/mod.rs lacks the outer request-logging wrapper used by the HTTP protocol, and failures in warpgate-protocol-kubernetes/src/server/handlers.rs can short-circuit before its inner log point. An unauthenticated network client can therefore induce failures and receive ASN.1/DER parser diagnostics or sea_orm database errors without the attempt being recorded in the gateway log. The disclosed information is limited to internal diagnostics, and no user-data, integrity, or availability impact is established. This issue is fixed in version 0.29.0.
Published: 2026-11-04
Score: 3.7 Low
EPSS: n/a
KEV: No
Impact: Information Disclosure
Action: Apply Patch
AI Analysis

Impact

Warpgate, an open source bastion host, has a flaw in its Kubernetes listener that allows an unauthenticated client to trigger internal error messages. When authentication or lookup fails, the server returns the raw ASN.1/DER parser diagnostics or database error text in an HTTP 500 response. This exposes internal diagnostic details to the caller but does not leak user data or compromise integrity or availability.

Affected Systems

Warp‑tech's Warpgate versions prior to 0.29.0 are affected.

Risk and Exploitability

The vulnerability is low severity with a CVSS score of 3.7 and no EPSS or KEV marking. An attacker with network access to the Kubernetes listener can provoke error responses without needing credentials, exposing internal diagnostics that may aid future attacks. No direct code execution or denial of service is possible, but the information leak could assist in mapping system internals.

Generated by OpenCVE AI on November 4, 2026 at 17:11 UTC.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Update Warpgate to version 0.29.0 or newer, which eliminates the error‑leak condition in the Kubernetes listener.
  • Disable the AcceptAnyClientCert mode for unauthenticated connections and validate client certificates before processing authentication.
  • Restrict network access to the Kubernetes listener to trusted IP ranges or VPN endpoints.

Generated by OpenCVE AI on November 4, 2026 at 17:11 UTC.

Tracking

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Advisories

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History

Wed, 04 Nov 2026 17:00:00 +0000

Type Values Removed Values Added
First Time appeared Warp-tech
Warp-tech warpgate
Vendors & Products Warp-tech
Warp-tech warpgate

Wed, 04 Nov 2026 15:30:00 +0000

Type Values Removed Values Added
Description Warpgate is an open source SSH, HTTPS, and MySQL bastion host for Linux. Prior to 0.29.0, the Kubernetes protocol listener uses AcceptAnyClientCert in warpgate-protocol-kubernetes/src/server/client_certs.rs to accept certificates at the TLS layer and defer validation to warpgate-protocol-kubernetes/src/server/auth.rs, where authentication and lookup failures are rendered verbatim in an HTTP 500 response body. The Kubernetes application in warpgate-protocol-kubernetes/src/server/mod.rs lacks the outer request-logging wrapper used by the HTTP protocol, and failures in warpgate-protocol-kubernetes/src/server/handlers.rs can short-circuit before its inner log point. An unauthenticated network client can therefore induce failures and receive ASN.1/DER parser diagnostics or sea_orm database errors without the attempt being recorded in the gateway log. The disclosed information is limited to internal diagnostics, and no user-data, integrity, or availability impact is established. This issue is fixed in version 0.29.0.
Title Warpgate: Kubernetes listener discloses internal error text to an unauthenticated caller
Weaknesses CWE-209
CWE-532
References
Metrics cvssV3_1

{'score': 3.7, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N'}

Subscriptions

Warp-tech Warpgate
cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-11-04T15:19:15.511Z

Reserved: 2026-09-14T21:20:41.196Z

Link: CVE-2026-91163

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Deferred

Published: 2026-11-04T16:17:54.543

Modified: 2026-11-04T16:17:54.847

Link: CVE-2026-91163

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-11-04T17:15:14Z

Weaknesses
  • CWE-209

    Generation of Error Message Containing Sensitive Information

  • CWE-532

    Insertion of Sensitive Information into Log File