warp-tech Warpgate up to 0.28.x Kubernetes Protocol Listener client_certs.rs information disclosure

Summaryinfo

A vulnerability was found in warp-tech Warpgate up to 0.28.x. It has been classified as problematic. The affected element is an unknown function of the file warpgate-protocol-kubernetes/src/server/client_certs.rs of the component Kubernetes Protocol Listener. This manipulation causes information disclosure. This vulnerability is tracked as CVE-2026-91163. The attack is possible to be carried out remotely. No exploit exists. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in warp-tech Warpgate up to 0.28.x. It has been declared as problematic. Affected by this vulnerability is an unknown code block of the file warpgate-protocol-kubernetes/src/server/client_certs.rs of the component Kubernetes Protocol Listener. The manipulation with an unknown input leads to a information disclosure vulnerability. The CWE definition for the vulnerability is CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. As an impact it is known to affect confidentiality. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-91163 since 09/14/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1592 according to MITRE ATT&CK.

Upgrading to version 0.29.0 eliminates this vulnerability.

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Productinfo

Vendor

• warp-tech

Name

• Warpgate

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6
• 0.7
• 0.8
• 0.9
• 0.10
• 0.11
• 0.12
• 0.13
• 0.14
• 0.15
• 0.16
• 0.17
• 0.18
• 0.19
• 0.20
• 0.21
• 0.22
• 0.23
• 0.24
• 0.25
• 0.26
• 0.27
• 0.28

Website

• Product: https://github.com/warp-tech/warpgate/

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