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A command line tool and library for transferring data with URL syntax, supporting DICT, FILE, FTP, FTPS, GOPHER, GOPHERS, HTTP, HTTPS, IMAP, IMAPS, LDAP, LDAPS, MQTT, POP3, POP3S, RTMP, RTMPS, RTSP, SCP, SFTP, SMB, SMBS, SMTP, SMTPS, TELNET, TFTP, WS and WSS. libcurl offers a myriad of powerful features
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Stefan Eissing 3c007d6351
openssl+ech: workaround for insecure handshakes 
OpenSSL 4.0.0-dev supports ECH with one flaw. If peer verification
is not enabled, it will report SSL_ECH_STATUS_BAD_NAME on the ECH
status.

Provide a workaround in libcurl that checks the inner name used in
ECH was the peer's hostname, both verify peer and host are disabled
and then accept the BAD_NAME without failing the connect.

Fixes #20655
Reported-by: Dexter Gerig
Closes #20821
2026-03-06 22:42:40 +01:00
.circleci runtests: detect bad libssh differently for test 1459 (fixing CircleCI libssh job) 2025-11-16 23:28:44 +01:00
.github spelling: bump codespell to 2.4.2, fix fallouts 2026-03-06 00:30:32 +01:00
CMake cmake: fix LOCATION property access condition (debug) 2026-03-06 15:35:27 +01:00
docs examples: improve OpenSSL certificate examples 2026-03-04 12:37:31 +01:00
include curl.h: remove CURLPROTO_MQTTS from the public header 2026-03-03 23:14:34 +01:00
lib openssl+ech: workaround for insecure handshakes 2026-03-06 22:42:40 +01:00
LICENSES krb5: drop support for Kerberos FTP 2025-09-20 23:58:28 +02:00
m4 build: map Apple clang 26.4+ to llvm/clang 21.1 2026-02-25 13:16:07 +01:00
projects tidy-up: miscellaneous 2026-02-25 14:44:56 +01:00
scripts cmake: improve clang-tidy test command-line reproduction 2026-03-06 04:56:33 +01:00
src config2setopts: restore proper ignoring of CAINFO BLOB option errors 2026-03-03 22:54:23 +01:00
tests spelling: bump codespell to 2.4.2, fix fallouts 2026-03-06 00:30:32 +01:00
.clang-tidy.yml clang-tidy: fix readability-suspicious-call-argument 2026-03-02 15:28:25 +01:00
.dir-locals.el copyright: update all copyright lines and remove year ranges 2023-01-03 09:19:21 +01:00
.editorconfig .editorconfig: add 2025-09-02 08:36:40 +02:00
.git-blame-ignore-revs copyright: update all copyright lines and remove year ranges 2023-01-03 09:19:21 +01:00
.gitattributes winbuild: MS-DOS batch tidy-ups 2024-07-02 19:26:15 +02:00
.gitignore build: drop the winbuild build system 2025-09-20 01:20:25 +02:00
.mailmap mailmap: Hamza Bensliman 2026-02-26 20:07:23 +01:00
acinclude.m4 build: check MSG_NOSIGNAL directly, drop detection and interim macro 2026-02-11 14:51:08 +01:00
appveyor.sh appveyor: minor improvements [ci skip] 2026-02-27 16:04:21 +01:00
appveyor.yml appveyor: minor improvements [ci skip] 2026-02-27 16:04:21 +01:00
buildconf copyright: update all copyright lines and remove year ranges 2023-01-03 09:19:21 +01:00
CHANGES.md CHANGES: fix typo in filename 2026-01-01 12:20:10 +01:00
CMakeLists.txt cmake: mark two internal options as advanced 2026-03-05 04:00:08 +01:00
configure.ac build: drop unused snprintf() feature check on Windows 2026-03-02 22:40:29 +01:00
COPYING COPYING: bump copyright year range to 1996 - 2026 2026-01-08 23:19:44 +01:00
curl-config.in autotools: tidy-up if expressions 2025-12-10 22:29:19 +01:00
Dockerfile Dockerfile: update debian:bookworm-slim digest to 74d56e3 2026-03-03 01:36:55 +01:00
GIT-INFO.md REUSE: add copyright header to two files 2025-11-03 16:08:52 +01:00
libcurl.pc.in configure: do not echo most inherited LDFLAGS to config files 2024-11-14 09:55:45 +01:00
Makefile.am cmake: add C++ integration test 2026-02-23 14:43:37 +01:00
README BUG-BOUNTY.md: we stop the bug-bounty end of Jan 2026 2026-01-26 08:26:28 +01:00
README.md README: add MQTTS 2026-02-05 22:55:01 +01:00
RELEASE-NOTES cmake: rename testbins target to tt, restore internal option 2026-03-01 00:24:47 +01:00
renovate.json renovate: merge two custom regex rules, escape dots 2026-01-23 15:58:16 +01:00
REUSE.toml REUSE: drop broken reference to MAIL-ETIQUETTE 2026-01-19 07:48:15 +01:00
SECURITY.md stop using the word 'just' 2026-03-03 15:30:22 +01:00

README.md

curl logo

curl is a command-line tool for transferring data from or to a server using URLs. It supports these protocols: DICT, FILE, FTP, FTPS, GOPHER, GOPHERS, HTTP, HTTPS, IMAP, IMAPS, LDAP, LDAPS, MQTT, MQTTS, POP3, POP3S, RTMP, RTMPS, RTSP, SCP, SFTP, SMB, SMBS, SMTP, SMTPS, TELNET, TFTP, WS and WSS.

Learn how to use curl by reading the man page or everything curl.

Find out how to install curl by reading the INSTALL document.

libcurl is the library curl is using to do its job. It is readily available to be used by your software. Read the libcurl man page to learn how.

Open Source

curl is Open Source and is distributed under an MIT-like license.

Contact

Contact us on a suitable mailing list or use GitHub issues/ pull requests/ discussions.

All contributors to the project are listed in the THANKS document.

Commercial support

For commercial support, maybe private and dedicated help with your problems or applications using (lib)curl visit the support page.

Website

Visit the curl website for the latest news and downloads.

Source code

Download the latest source from the Git server:

git clone https://github.com/curl/curl

Security problems

Report suspected security problems privately and not in public.

Backers

Thank you to all our backers 🙏 Become a backer.

Sponsors

Support this project by becoming a sponsor.