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KNOWN_BUGS: Access violation sending client cert with SChannel

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It seems we can select between crashing or leaking sensitive files
because Schannel is buggy.

Closes #17626
Closes #18679
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Daniel Stenberg 2025-09-22 10:09:18 +02:00
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@ -15,6 +15,7 @@ problems may have been fixed or changed somewhat since this was written.
2. TLS
2.1 IMAPS connection fails with Rustls error
2.2 Access violation sending client cert with Schannel
2.5 Client cert handling with Issuer DN differs between backends
2.7 Client cert (MTLS) issues with Schannel
2.11 Schannel TLS 1.2 handshake bug in old Windows versions
@ -120,6 +121,14 @@ problems may have been fixed or changed somewhat since this was written.
https://github.com/curl/curl/issues/10457
2.2 Access violation sending client cert with Schannel
When using Schannel to do client certs, curl sets PKCS12_NO_PERSIST_KEY to
avoid leaking the private key into the filesystem. Unfortunately that flag
instead seems to trigger a crash.
See https://github.com/curl/curl/issues/17626
2.5 Client cert handling with Issuer DN differs between backends
When the specified client certificate does not match any of the