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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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Sergio Correia 61d59c9e39
x509asn1: fix DH public key parameter extraction 
The dh(g) parameter was read from param->beg instead of from the
cursor p returned by parsing dh(p). This caused dh(g) to always
report the same value as dh(p) when inspecting DH certificates
via CURLOPT_CERTINFO on non-OpenSSL backends.

The DSA branch correctly advances the cursor; the DH branch lost
this during what appears to be a copy-paste.

Add unit1676 to verify that dh(p) and dh(g) report distinct values
using a hand-crafted minimal DER certificate.

Assisted by: Claude Opus 4.6
Signed-off-by: Sergio Correia <scorreia@redhat.com>
Closes #21595
2026-05-16 01:06:56 +02:00
.circleci runtests: detect bad libssh differently for test 1459 (fixing CircleCI libssh job) 2025-11-16 23:28:44 +01:00
.github src: add curlx_memzero() to clear buffers securely 2026-05-16 00:26:46 +02:00
CMake src: add curlx_memzero() to clear buffers securely 2026-05-16 00:26:46 +02:00
docs KNOWN_BUGS.md: remove fixed x509asn.1 bug 2026-05-16 01:03:16 +02:00
include tidy-up: prefer "initialize" with a 'z' 2026-05-15 11:49:06 +02:00
lib x509asn1: fix DH public key parameter extraction 2026-05-16 01:06:56 +02:00
LICENSES spacecheck: check long lines and repeat spaces, fix fallouts 2026-03-25 11:02:08 +01:00
m4 src: add curlx_memzero() to clear buffers securely 2026-05-16 00:26:46 +02:00
projects tidy-up: prefer "initialize" with a 'z' 2026-05-15 11:49:06 +02:00
scripts pythonlint.sh: make it fail on error, fix ruff warnings in pytest 2026-05-13 22:59:36 +02:00
src tidy-up: prefer "initialize" with a 'z' 2026-05-15 11:49:06 +02:00
tests x509asn1: fix DH public key parameter extraction 2026-05-16 01:06:56 +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 tool: fix two more allocator mismatches 2026-03-30 16:17:42 +02:00
acinclude.m4 configure: tidy up comments 2026-04-10 23:19:41 +02:00
appveyor.sh appveyor: bump to OpenSSL 3.6 2026-04-22 09:29:05 +02:00
appveyor.yml CI: set DO_NOT_TRACK=1 2026-04-23 11:22:35 +02:00
CHANGES.md CHANGES: fix typo in filename 2026-01-01 12:20:10 +01:00
CMakeLists.txt src: add curlx_memzero() to clear buffers securely 2026-05-16 00:26:46 +02:00
configure.ac src: add curlx_memzero() to clear buffers securely 2026-05-16 00:26:46 +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 Dockerfile: update debian:bookworm-slim Docker digest to 67b30a6 2026-05-09 15:33:09 +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 rtmp: drop support 2026-03-21 14:56:06 +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 rtmp: drop support 2026-03-21 14:56:06 +01:00
RELEASE-NOTES THANKS-filter: update 2026-05-13 00:43:27 +02:00
renovate.json renovate: use standard bump formula for OpenSSL 2026-04-15 10:17:33 +02:00
REUSE.toml badwords: avoid 'simply' 2026-03-10 19:34:06 +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, 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.