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Code Editor : KNOWN_BUGS
_ _ ____ _ ___| | | | _ \| | / __| | | | |_) | | | (__| |_| | _ <| |___ \___|\___/|_| \_\_____| Known Bugs These are problems and bugs known to exist at the time of this release. Feel free to join in and help us correct one or more of these. Also be sure to check the changelog of the current development status, as one or more of these problems may have been fixed or changed somewhat since this was written. 1. HTTP 2. TLS 2.1 IMAPS connection fails with Rustls error 2.3 Unable to use PKCS12 certificate with Secure Transport 2.4 Secure Transport does not import PKCS#12 client certificates without a password 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 2.13 CURLOPT_CERTINFO results in CURLE_OUT_OF_MEMORY with Schannel 3. Email protocols 3.1 IMAP SEARCH ALL truncated response 3.2 No disconnect command 3.4 AUTH PLAIN for SMTP is not working on all servers 3.5 APOP authentication fails on POP3 3.6 POP3 issue when reading small chunks 4. Command line 4.1 -T /dev/stdin may upload with an incorrect content length 4.2 -T - always uploads chunked 5. Build and portability issues 5.1 OS400 port requires deprecated IBM library 5.2 curl-config --libs contains private details 5.3 LDFLAGS passed too late making libs linked incorrectly 5.6 Cygwin: make install installs curl-config.1 twice 5.11 configure --with-gssapi with Heimdal is ignored on macOS 5.12 flaky CI builds 5.13 long paths are not fully supported on Windows 5.15 Unicode on Windows 6. Authentication 6.2 MIT Kerberos for Windows build 6.3 NTLM in system context uses wrong name 6.5 NTLM does not support password with § character 6.6 libcurl can fail to try alternatives with --proxy-any 6.7 Do not clear digest for single realm 6.8 Heimdal memory leaks 6.9 SHA-256 digest not supported in Windows SSPI builds 6.10 curl never completes Negotiate over HTTP 6.11 Negotiate on Windows fails 6.12 cannot use Secure Transport with Crypto Token Kit 6.13 Negotiate against Hadoop HDFS 7. FTP 7.4 FTP with ACCT 7.12 FTPS directory listing hangs on Windows with Schannel 9. SFTP and SCP 9.1 SFTP does not do CURLOPT_POSTQUOTE correct 9.2 wolfssh: publickey auth does not work 9.3 Remote recursive folder creation with SFTP 9.4 libssh blocking and infinite loop problem 9.5 Cygwin: "WARNING: UNPROTECTED PRIVATE KEY FILE!" 10. SOCKS 11. Internals 11.1 gssapi library name + version is missing in curl_version_info() 11.2 error buffer not set if connection to multiple addresses fails 11.3 TFTP tests fail on OpenBSD 11.4 HTTP test server 'connection-monitor' problems 11.5 Connection information when using TCP Fast Open 11.6 test cases sometimes timeout 11.7 CURLOPT_CONNECT_TO does not work for HTTPS proxy 11.8 WinIDN test failures 12. LDAP 12.1 OpenLDAP hangs after returning results 12.2 LDAP on Windows does authentication wrong? 12.3 LDAP on Windows does not work 12.4 LDAPS requests to ActiveDirectory server hang 13. TCP/IP 13.2 Trying local ports fails on Windows 15. CMake 15.1 cmake outputs: no version information available 15.2 support build with GnuTLS 15.3 unusable tool_hugehelp.c with MinGW 15.6 uses -lpthread instead of Threads::Threads 15.7 generated .pc file contains strange entries 15.13 CMake build with MIT Kerberos does not work 16. aws-sigv4 16.2 aws-sigv4 does not handle multipart/form-data correctly 16.3 aws-sigv4 has problems with particular URLs 16.6 aws-sigv4 does not behave well with AWS VPC Lattice 17. HTTP/2 17.1 HTTP/2 prior knowledge over proxy 17.2 HTTP/2 frames while in the connection pool kill reuse 17.3 ENHANCE_YOUR_CALM causes infinite retries 17.4 HTTP/2 + TLS spends a lot of time in recv 18. HTTP/3 18.1 connection migration does not work 18.2 quiche: QUIC connection is draining 19. RTSP 19.1 Some methods do not support response bodies ============================================================================== 1. HTTP 2. TLS 2.1 IMAPS connection fails with Rustls error https://github.com/curl/curl/issues/10457 2.3 Unable to use PKCS12 certificate with Secure Transport See https://github.com/curl/curl/issues/5403 2.4 Secure Transport does not import PKCS#12 client certificates without a password libcurl calls SecPKCS12Import with the PKCS#12 client certificate, but that function rejects certificates that do not have a password. https://github.com/curl/curl/issues/1308 2.5 Client cert handling with Issuer DN differs between backends When the specified client certificate does not match any of the server-specified DNs, the OpenSSL and GnuTLS backends behave differently. The github discussion may contain a solution. See https://github.com/curl/curl/issues/1411 2.7 Client cert (MTLS) issues with Schannel See https://github.com/curl/curl/issues/3145 2.11 Schannel TLS 1.2 handshake bug in old Windows versions In old versions of Windows such as 7 and 8.1 the Schannel TLS 1.2 handshake implementation likely has a bug that can rarely cause the key exchange to fail, resulting in error SEC_E_BUFFER_TOO_SMALL or SEC_E_MESSAGE_ALTERED. https://github.com/curl/curl/issues/5488 2.13 CURLOPT_CERTINFO results in CURLE_OUT_OF_MEMORY with Schannel https://github.com/curl/curl/issues/8741 3. Email protocols 3.1 IMAP SEARCH ALL truncated response IMAP "SEARCH ALL" truncates output on large boxes. "A quick search of the code reveals that pingpong.c contains some truncation code, at line 408, when it deems the server response to be too large truncating it to 40 characters" https://curl.se/bug/view.cgi?id=1366 3.2 No disconnect command The disconnect commands (LOGOUT and QUIT) may not be sent by IMAP, POP3 and SMTP if a failure occurs during the authentication phase of a connection. 3.4 AUTH PLAIN for SMTP is not working on all servers Specifying "--login-options AUTH=PLAIN" on the command line does not seem to work correctly. See https://github.com/curl/curl/issues/4080 3.5 APOP authentication fails on POP3 See https://github.com/curl/curl/issues/10073 3.6 POP3 issue when reading small chunks CURL_DBG_SOCK_RMAX=4 ./runtests.pl -v 982 See https://github.com/curl/curl/issues/12063 4. Command line 4.1 -T /dev/stdin may upload with an incorrect content length -T stats the path to figure out its size in bytes to use it as Content-Length if it is a regular file. The problem with that is that, on BSDs and some other UNIXes (not Linux), open(path) may not give you a file descriptor with a 0 offset from the start of the file. See https://github.com/curl/curl/issues/12177 4.2 -T - always uploads chunked When the `<` shell operator is used. curl should realise that stdin is a regular file in this case, and that it can do a non-chunked upload, like it would do if you used -T file. See https://github.com/curl/curl/issues/12171 5. Build and portability issues 5.1 OS400 port requires deprecated IBM library curl for OS400 requires QADRT to build, which provides ASCII wrappers for libc/POSIX functions in the ILE, but IBM no longer supports or even offers this library to download. See https://github.com/curl/curl/issues/5176 5.2 curl-config --libs contains private details "curl-config --libs" include details set in LDFLAGS when configure is run that might be needed only for building libcurl. Further, curl-config --cflags suffers from the same effects with CFLAGS/CPPFLAGS. 5.3 LDFLAGS passed too late making libs linked incorrectly Compiling latest curl on HP-UX and linking against a custom OpenSSL (which is on the default loader/linker path), fails because the generated Makefile has LDFLAGS passed on after LIBS. See https://github.com/curl/curl/issues/14893 5.6 Cygwin: make install installs curl-config.1 twice https://github.com/curl/curl/issues/8839 5.11 configure --with-gssapi with Heimdal is ignored on macOS ... unless you also pass --with-gssapi-libs https://github.com/curl/curl/issues/3841 5.12 flaky CI builds We run many CI builds for each commit and PR on github, and especially a number of the Windows builds are flaky. This means that we rarely get all CI builds go green and complete without errors. This is unfortunate as it makes us sometimes miss actual build problems and it is surprising to newcomers to the project who (rightfully) do not expect this. See https://github.com/curl/curl/issues/6972 5.13 long paths are not fully supported on Windows curl on Windows cannot access long paths (paths longer than 260 characters). However, as a workaround, the Windows path prefix \\?\ which disables all path interpretation may work to allow curl to access the path. For example: \\?\c:\longpath. See https://github.com/curl/curl/issues/8361 5.15 Unicode on Windows Passing in a Unicode filename with -o: https://github.com/curl/curl/issues/11461 Passing in Unicode character with -d: https://github.com/curl/curl/issues/12231 Windows Unicode builds use homedir in current locale The Windows Unicode builds of curl use the current locale, but expect Unicode UTF-8 encoded paths for internal use such as open, access and stat. The user's home directory is retrieved via curl_getenv in the current locale and not as UTF-8 encoded Unicode. See https://github.com/curl/curl/pull/7252 and https://github.com/curl/curl/pull/7281 Cannot handle Unicode arguments in non-Unicode builds on Windows If a URL or filename cannot be encoded using the user's current codepage then it can only be encoded properly in the Unicode character set. Windows uses UTF-16 encoding for Unicode and stores it in wide characters, however curl and libcurl are not equipped for that at the moment except when built with _UNICODE and UNICODE defined. Except for Cygwin, Windows cannot use UTF-8 as a locale. https://curl.se/bug/?i=345 https://curl.se/bug/?i=731 https://curl.se/bug/?i=3747 NTLM authentication and Unicode NTLM authentication involving Unicode username or password only works properly if built with UNICODE defined together with the Schannel backend. The original problem was mentioned in: https://curl.se/mail/lib-2009-10/0024.html https://curl.se/bug/view.cgi?id=896 The Schannel version verified to work as mentioned in https://curl.se/mail/lib-2012-07/0073.html 6. Authentication 6.2 MIT Kerberos for Windows build libcurl fails to build with MIT Kerberos for Windows (KfW) due to KfW's library header files exporting symbols/macros that should be kept private to the KfW library. See ticket #5601 at https://krbdev.mit.edu/rt/ 6.3 NTLM in system context uses wrong name NTLM authentication using SSPI (on Windows) when (lib)curl is running in "system context" makes it use wrong(?) username - at least when compared to what winhttp does. See https://curl.se/bug/view.cgi?id=535 6.5 NTLM does not support password with § character https://github.com/curl/curl/issues/2120 6.6 libcurl can fail to try alternatives with --proxy-any When connecting via a proxy using --proxy-any, a failure to establish an authentication causes libcurl to abort trying other options if the failed method has a higher preference than the alternatives. As an example, --proxy-any against a proxy which advertise Negotiate and NTLM, but which fails to set up Kerberos authentication does not proceed to try authentication using NTLM. https://github.com/curl/curl/issues/876 6.7 Do not clear digest for single realm https://github.com/curl/curl/issues/3267 6.8 Heimdal memory leaks Running test 2077 and 2078 with curl built to do GSS with Heimdal causes valgrind errors (memory leak). https://github.com/curl/curl/issues/14446 6.9 SHA-256 digest not supported in Windows SSPI builds Windows builds of curl that have SSPI enabled use the native Windows API calls to create authentication strings. The call to InitializeSecurityContext fails with SEC_E_QOP_NOT_SUPPORTED which causes curl to fail with CURLE_AUTH_ERROR. Microsoft does not document supported digest algorithms and that SEC_E error code is not a documented error for InitializeSecurityContext (digest). https://github.com/curl/curl/issues/6302 6.10 curl never completes Negotiate over HTTP Apparently it is not working correctly...? See https://github.com/curl/curl/issues/5235 6.11 Negotiate on Windows fails When using --negotiate (or NTLM) with curl on Windows, SSL/TLS handshake fails despite having a valid kerberos ticket cached. Works without any issue in Unix/Linux. https://github.com/curl/curl/issues/5881 6.12 cannot use Secure Transport with Crypto Token Kit https://github.com/curl/curl/issues/7048 6.13 Negotiate authentication against Hadoop HDFS https://github.com/curl/curl/issues/8264 7. FTP 7.4 FTP with ACCT When doing an operation over FTP that requires the ACCT command (but not when logging in), the operation fails since libcurl does not detect this and thus fails to issue the correct command: https://curl.se/bug/view.cgi?id=635 7.12 FTPS server compatibility on Windows with Schannel FTPS is not widely used with the Schannel TLS backend and so there may be more bugs compared to other TLS backends such as OpenSSL. In the past users have reported hanging and failed connections. It is likely some changes to curl since then fixed the issues. None of the reported issues can be reproduced any longer. If you encounter an issue connecting to your server via FTPS with the latest curl and Schannel then please search for open issues or file a new issue. 9. SFTP and SCP 9.1 SFTP does not do CURLOPT_POSTQUOTE correct When libcurl sends CURLOPT_POSTQUOTE commands when connected to a SFTP server using the multi interface, the commands are not being sent correctly and instead the connection is "cancelled" (the operation is considered done) prematurely. There is a half-baked (busy-looping) patch provided in the bug report but it cannot be accepted as-is. See https://curl.se/bug/view.cgi?id=748 9.2 wolfssh: publickey auth does not work When building curl to use the wolfSSH backend for SFTP, the publickey authentication does not work. This is simply functionality not written for curl yet, the necessary API for make this work is provided by wolfSSH. See https://github.com/curl/curl/issues/4820 9.3 Remote recursive folder creation with SFTP On this servers, the curl fails to create directories on the remote server even when the CURLOPT_FTP_CREATE_MISSING_DIRS option is set. See https://github.com/curl/curl/issues/5204 9.4 libssh blocking and infinite loop problem In the SSH_SFTP_INIT state for libssh, the ssh session working mode is set to blocking mode. If the network is suddenly disconnected during sftp transmission, curl is stuck, even if curl is configured with a timeout. https://github.com/curl/curl/issues/8632 9.5 Cygwin: "WARNING: UNPROTECTED PRIVATE KEY FILE!" Running SCP and SFTP tests on Cygwin makes this warning message appear. https://github.com/curl/curl/issues/11244 10. SOCKS 11. Internals 11.1 gssapi library name + version is missing in curl_version_info() The struct needs to be expanded and code added to store this info. See https://github.com/curl/curl/issues/13492 11.2 error buffer not set if connection to multiple addresses fails If you ask libcurl to resolve a hostname like example.com to IPv6 addresses when you only have IPv4 connectivity. libcurl fails with CURLE_COULDNT_CONNECT, but the error buffer set by CURLOPT_ERRORBUFFER remains empty. Issue: https://github.com/curl/curl/issues/544 11.3 TFTP tests fail on OpenBSD When adding an OpenBSD job with tests to GHA, some tests consistently fail to run. See https://github.com/curl/curl/issues/13623 11.4 HTTP test server 'connection-monitor' problems The 'connection-monitor' feature of the sws HTTP test server does not work properly if some tests are run in unexpected order. Like 1509 and then 1525. See https://github.com/curl/curl/issues/868 11.5 Connection information when using TCP Fast Open CURLINFO_LOCAL_PORT (and possibly a few other) fails when TCP Fast Open is enabled. See https://github.com/curl/curl/issues/1332 and https://github.com/curl/curl/issues/4296 11.6 test cases sometimes timeout Occasionally, one of the tests timeouts. Inexplicably. See https://github.com/curl/curl/issues/13350 11.7 CURLOPT_CONNECT_TO does not work for HTTPS proxy It is unclear if the same option should even cover the proxy connection or if if requires a separate option. See https://github.com/curl/curl/issues/14481 11.8 WinIDN test failures Test 165 disabled when built with WinIDN. 12. LDAP 12.1 OpenLDAP hangs after returning results By configuration defaults, OpenLDAP automatically chase referrals on secondary socket descriptors. The OpenLDAP backend is asynchronous and thus should monitor all socket descriptors involved. Currently, these secondary descriptors are not monitored, causing OpenLDAP library to never receive data from them. As a temporary workaround, disable referrals chasing by configuration. The fix is not easy: proper automatic referrals chasing requires a synchronous bind callback and monitoring an arbitrary number of socket descriptors for a single easy handle (currently limited to 5). Generic LDAP is synchronous: OK. See https://github.com/curl/curl/issues/622 and https://curl.se/mail/lib-2016-01/0101.html 12.2 LDAP on Windows does authentication wrong? https://github.com/curl/curl/issues/3116 12.3 LDAP on Windows does not work A simple curl command line getting "ldap://ldap.forumsys.com" returns an error that says "no memory" ! https://github.com/curl/curl/issues/4261 12.4 LDAPS requests to ActiveDirectory server hang https://github.com/curl/curl/issues/9580 13. TCP/IP 13.2 Trying local ports fails on Windows This makes '--local-port [range]' to not work since curl cannot properly detect if a port is already in use, so it tries the first port, uses that and then subsequently fails anyway if that was actually in use. https://github.com/curl/curl/issues/8112 15. CMake 15.1 cmake outputs: no version information available Something in the SONAME generation seems to be wrong in the cmake build. https://github.com/curl/curl/issues/11158 15.6 uses -lpthread instead of Threads::Threads See https://github.com/curl/curl/issues/6166 15.7 generated .pc file contains strange entries The Libs.private field of the generated .pc file contains -lgcc -lgcc_s -lc -lgcc -lgcc_s See https://github.com/curl/curl/issues/6167 15.13 CMake build with MIT Kerberos does not work Minimum CMake version was bumped in curl 7.71.0 (#5358) Since CMake 3.2 try_compile started respecting the CMAKE_EXE_FLAGS. The code dealing with MIT Kerberos detection sets few variables to potentially weird mix of space, and ;-separated flags. It had to blow up at some point. All the CMake checks that involve compilation are doomed from that point, the configured tree cannot be built. https://github.com/curl/curl/issues/6904 16. aws-sigv4 16.2 aws-sigv4 does not handle multipart/form-data correctly https://github.com/curl/curl/issues/13351 16.3 aws-sigv4 has problems with particular URLs https://github.com/curl/curl/issues/13058 16.6 aws-sigv4 does not behave well with AWS VPC Lattice https://github.com/curl/curl/issues/11007 17. HTTP/2 17.1 HTTP/2 prior knowledge over proxy https://github.com/curl/curl/issues/12641 17.2 HTTP/2 frames while in the connection pool kill reuse If the server sends HTTP/2 frames (like for example an HTTP/2 PING frame) to curl while the connection is held in curl's connection pool, the socket is found readable when considered for reuse and that makes curl think it is dead and then it is closed and a new connection gets created instead. This is *best* fixed by adding monitoring to connections while they are kept in the pool so that pings can be responded to appropriately. 17.3 ENHANCE_YOUR_CALM causes infinite retries Infinite retries with 2 parallel requests on one connection receiving GOAWAY with ENHANCE_YOUR_CALM error code. See https://github.com/curl/curl/issues/5119 17.4 HTTP/2 + TLS spends a lot of time in recv It has been observered that by making the speed limit less accurate we could improve this performance. (by reverting https://github.com/curl/curl/commit/db5c9f4f9e0779b49624752b135281a0717b277b) Can we find a golden middle ground? See https://curl.se/mail/lib-2024-05/0026.html and https://github.com/curl/curl/issues/13416 18. HTTP/3 18.1 connection migration does not work https://github.com/curl/curl/issues/7695 18.2 quiche: QUIC connection is draining The transfer ends with error "QUIC connection is draining". https://github.com/curl/curl/issues/12037 19. RTSP 19.1 Some methods do not support response bodies The RTSP implementation is written to assume that a number of RTSP methods always get responses without bodies, even though there seems to be no indication in the RFC that this is always the case. https://github.com/curl/curl/issues/12414
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