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Sep 20, 2026
An `ErrorResponse` to `SSLRequest` is currently reported as an SSL refusal, while transport fallback only handles a narrow set of authorization errors. Follow libpq transport-selection behavior and improve the SSL exchange diagnostic without trusting pre-TLS server text or exposing SQLSTATE (see CVE-2024-10977). Make it so that alternative transports in allow/prefer retries are only tried _before_ authentication succeeds, not after. While here, align asyncpg with libpq and require `ssl` to be set to a mandatory TLS mode (or explicit context) when `direct_tls` is specified. Fixes #1317. Closes #1346. Closes #1348.
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Fixes #1317.
When a server replies to
SSLRequestwith a pre-authE...error payload, preserve the server's diagnostic text in an asyncpgInterfaceErrorinstead of replacing it with the genericrejected SSL upgrademessage.Includes a regression test for the simplified pre-auth error form described in the issue.