cURL 7.50.2 released with multiple bug fixes

cURL 7.50.2 recently released, is an open source, command line tool for transferring data with URL syntax, supporting DICT, FILE, FTP, FTPS, Gopher, HTTP, HTTPS, IMAP, IMAPS, LDAP, LDAPS, POP3, POP3S, RTMP, RTSP, SCP, SFTP, SMTP, SMTPS, Telnet and TFTP. curl supports SSL certificates, HTTP POST, HTTP PUT, FTP uploading, HTTP form based upload, proxies, cookies, user+password authentication (Basic, Digest, NTLM, Negotiate, kerberos…), file transfer resume, proxy tunneling and a busload of other useful tricks.

curl tool

cURL 7.50.2 changelog

  • mbedtls: Added support for NTLM
  • SSH: fixed SFTP/SCP transfer problems
  • multi: make Curl_expire() work with 0 ms timeouts
  • -m keeps ca cert meta data in output
  • TFTP: Fix upload problem with piped input
  • CURLOPT_TCP_NODELAY: now enabled by default
  • mbedtls: set verbose TLS debug when MBEDTLS_DEBUG is defined
  • http2: always wait for readable socket
  • cmake: Enable win32 large file support by default
  • cmake: Enable win32 threaded resolver by default
  • winbuild: Avoid setting redundant CFLAGS to compile commands
  • curl.h: make CURL_NO_OLDIES define CURL_STRICTER
  • docs: make more markdown files use .md extension
  • docs: CONTRIBUTE and LICENSE-MIXING were converted to markdown
  • winbuild: Allow changing C compiler via environment variable CC
  • rtsp: accept any RTSP session id
  • HTTP: retry failed HEAD requests on reused connections too
  • configure: add zlib search with pkg-config
  • openssl: accept subjectAltName iPAddress if no dNSName match
  • MANUAL: Remove invalid link to LDAP documentation
  • socks: improved connection procedure
  • proxy: reject attempts to use unsupported proxy schemes
  • proxy: bring back use of “Proxy-Connection:”
  • curl: allow “pkcs11:” prefix for client certificates
  • spnego_sspi: fix memory leak in case *outlen is zero
  • SOCKS: improve verbose output of SOCKS5 connection sequence
  • SOCKS: display the hostname returned by the SOCKS5 proxy server
  • http/sasl: Query authentication mechanism supported by SSPI before using
  • sasl: Don’t use GSSAPI authentication when domain name not specified
  • win: Basic support for Universal Windows Platform apps
  • nss: fix incorrect use of a previously loaded certificate from file
  • nss: work around race condition in PK11_FindSlotByName()
  • ftp: fix wrong poll on the secondary socket
  • openssl: build warning-free with 1.1.0 (again)
  • HTTP: stop parsing headers when switching to unknown protocols
  • test219: Add http as a required feature
  • TLS: random file/egd doesn’t have to match for conn reuse
  • schannel: Disable ALPN for Wine since it is causing problems
  • http2: make sure stream errors don’t needlessly close the connection
  • http2: return CURLE_HTTP2_STREAM for unexpected stream close
  • darwinssl: –cainfo is intended for backward compatibility only
  • speed caps: not based on average speeds anymore
  • configure: make the cpp -P detection not clobber CPPFLAGS
  • http2: use named define instead of magic constant in read callback
  • http2: skip the content-length parsing, detect unknown size
  • http2: return EOF when done uploading without known size
  • darwinssl: test for errSecSuccess in PKCS12 import rather than noErr

Install curl 7.50.2 on Ubuntu 16.04 (Yakkety Yak), 16.04 (Xenial Xerus), Ubuntu 15.10 (Wily Werewolf), Ubuntu 15.04(Vivid Vervet), Ubuntu 14.04 (Trusty Tahr)


tar -xvf curl-7.50.2.tar.gz

cd curl-7.50.2/



sudo make install
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