# CVE-2026-91163: Warpgate: Kubernetes listener discloses internal error text to an unauthenticated caller

Status: published. Published: 2026-11-04. Updated: 2026-11-04.

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.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- warp-tech / warpgate: < 0.29.0 (affected). Source: CNA: GitHub_M

## Severity and prioritization

- CVSS 3.1: 3.7 (low); CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N; source: CNA: GitHub_M

- CVSS 3.1: 3.7 (low); CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N; source: NVD: security-advisories@github.com

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-209, CWE-532

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/warp-tech/warpgate/security/advisories/GHSA-hrfx-fm67-gv64 (CNA: GitHub_M; x_refsource_CONFIRM)

- https://github.com/warp-tech/warpgate/pull/2547 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/warp-tech/warpgate/commit/8426196a27c30fca521656653f9df1faf3df7523 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/warp-tech/warpgate/releases/tag/v0.29.0 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/warp-tech/warpgate/commit/8426196a27c30fca521656653f9df1faf3df7523 (security-advisories@github.com)

- https://github.com/warp-tech/warpgate/pull/2547 (security-advisories@github.com)

- https://github.com/warp-tech/warpgate/releases/tag/v0.29.0 (security-advisories@github.com)

- https://github.com/warp-tech/warpgate/security/advisories/GHSA-hrfx-fm67-gv64 (security-advisories@github.com)

## Provenance

- CNA: GitHub_M: https://www.cve.org/CVERecord?id=CVE-2026-91163; retrieved 2026-11-04; source updated 2026-11-04

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-91163; retrieved 2026-11-04; source updated 2026-11-04

Revision: 6702937b27fd2e211eefea021978d417cc441b0236daf6418c13b1ba88a57f2c

Canonical: https://y2.dev/cve/CVE-2026-91163

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