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un-nest curl

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Laan Tungir
2025-08-16 11:22:44 -04:00
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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
2.5 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
2.14 mbedTLS and CURLE_AGAIN handling
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 Unicode 'SECTION SIGN' 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
6.13 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!"
9.6 wolfssh: all tests fail
10. Connection
10.1 --interface with link-scoped IPv6 address
10.2 Does not acknowledge getaddrinfo sorting policy
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
11.4 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
11.9 setting a disabled option should return CURLE_NOT_BUILT_IN
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
15.6 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
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
2.5 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
2.14 mbedTLS and CURLE_AGAIN handling
https://github.com/curl/curl/issues/15801
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 Unicode 'SECTION SIGN' character
https://en.wikipedia.org/wiki/Section_sign
https://codepoints.net/U+00A7 SECTION SIGN
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
6.13 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 an 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
9.6 wolfssh: all tests fail
Something fundamental stops them all from working properly.
https://github.com/curl/curl/issues/16794
10. Connection
10.1 --interface with link-scoped IPv6 address
When you give the `--interface` option telling curl to use a specific
interface for its outgoing traffic in combination with an IPv6 address in the
URL that uses a link-local scope, curl might pick the wrong address from the
named interface and the subsequent transfer fails.
Example command line:
curl --interface eth0 'http://[fe80:928d:xxff:fexx:xxxx]/'
The fact that the given IP address is link-scoped should probably be used as
input to somehow make curl make a better choice for this.
https://github.com/curl/curl/issues/14782
10.2 Does not acknowledge getaddrinfo sorting policy
Even if a user edits /etc/gai.conf to prefer IPv4, curl still prefers and
tries IPv6 addresses first.
https://github.com/curl/curl/issues/16718
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
11.4 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.
11.9 setting a disabled option should return CURLE_NOT_BUILT_IN
When curl has been built with specific features or protocols disabled,
setting such options with curl_easy_setopt() should rather return
CURLE_NOT_BUILT_IN instead of CURLE_UNKNOWN_OPTION to signal the difference
to the application
See https://github.com/curl/curl/issues/15472
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
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 observed 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