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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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Daniel Stenberg a6af50c484
multi: forbid curl_easy_pause from within multi socket callback 
- there is a risk for a nasty recursive situation

- we avoid certain risks that the pause call changes things so that when
  returning from the callback, the state of some internals is undefined
  and we need to reload which is easy to miss

- we can't think of legitiate use cases for doing this. This is
  basically just the new favorite point for AI and security researchers
  to find hypothetical problems

Closes #22179
2026-06-26 13:43:48 +02:00
.circleci runtests: detect bad libssh differently for test 1459 (fixing CircleCI libssh job) 2025-11-16 23:28:44 +01:00
.github tidy-up: docs, comments, typos, whitespace 2026-06-26 11:36:09 +02:00
CMake tidy-up: docs, comments, typos, whitespace 2026-06-26 11:36:09 +02:00
docs multi: forbid curl_easy_pause from within multi socket callback 2026-06-26 13:43:48 +02:00
include RELEASE-NOTES: synced 2026-06-25 08:42:02 +02:00
lib multi: forbid curl_easy_pause from within multi socket callback 2026-06-26 13:43:48 +02:00
LICENSES spacecheck: check long lines and repeat spaces, fix fallouts 2026-03-25 11:02:08 +01:00
m4 tidy-up: docs, comments, typos, whitespace 2026-06-26 11:36:09 +02:00
projects tidy-up: make 'CA' uppercase, where missing 2026-06-22 21:04:45 +02:00
scripts tool_operate: remove call to abort() 2026-06-26 13:41:55 +02:00
src tool_operate: remove call to abort() 2026-06-26 13:41:55 +02:00
tests multi: forbid curl_easy_pause from within multi socket callback 2026-06-26 13:43:48 +02:00
.clang-tidy.yml clang-tidy: enable more checks, fix fallouts 2026-04-14 02:20:16 +02:00
.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 buildconf: remove 2026-04-04 11:35:24 +02:00
.gitignore build: drop the winbuild build system 2025-09-20 01:20:25 +02:00
.mailmap mailmap: Darren Banfi 2026-06-12 14:48:12 +02:00
acinclude.m4 tidy-up: docs, comments, typos, whitespace 2026-06-26 11:36:09 +02:00
appveyor.sh scripts: use end-of-options marker in cd, mkdir, mv, sha256sum commands 2026-06-25 11:32:36 +02:00
appveyor.yml appveyor: bump 3 VS2022 jobs to VS2026 2026-06-09 21:16:54 +02:00
CHANGES.md CHANGES: fix typo in filename 2026-01-01 12:20:10 +01:00
CMakeLists.txt tidy-up: docs, comments, typos, whitespace 2026-06-26 11:36:09 +02:00
configure.ac tidy-up: docs, comments, typos, whitespace 2026-06-26 11:36:09 +02:00
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 GHA: update debian:bookworm-slim Docker digest to 60eac75 2026-06-24 11:42:21 +02:00
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 autotools: minor fixes and improvements 2026-06-25 11:32:36 +02:00
README BUG-BOUNTY.md: we stop the bug-bounty end of Jan 2026 2026-01-26 08:26:28 +01:00
README.md rtmp: drop support 2026-03-21 14:56:06 +01:00
RELEASE-NOTES RELEASE-NOTES: synced 2026-06-25 08:42:02 +02:00
renovate.json renovate: use standard bump formula for OpenSSL 2026-04-15 10:17:33 +02:00
REUSE.toml github: Add AI usage warning to issue, doc and PR templates 2026-06-02 13:47:01 -04:00
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, 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.