the 264th release 8 changes 56 days (total: 9,819) 244 bugfixes (total: 11,417) 367 commits (total: 34,180) 2 new public libcurl function (total: 96) 0 new curl_easy_setopt() option (total: 306) 1 new curl command line option (total: 267) 65 contributors, 34 new (total: 3,332) 34 authors, 18 new (total: 1,341) 3 security fixes (total: 164)
Security
CVE-2025-0167: netrc and default credential leak. When asked to use a .netrc file for credentials and to follow HTTP redirects, curl could leak the password used for the first host to the followed-to host under certain circumstances. This flaw only manifests itself if the netrc file has a default entry that omits both login and password. A rare circumstance.
CVE-2025-0665: eventfd double close. libcurl would wrongly close the same file descriptor twice when taking down a connection channel after having completed a threaded name resolve.
CVE-2025-0725: gzip integer overflow. When libcurl is asked to perform automatic gzip decompression of content-encoded HTTP responses with the CURLOPT_ACCEPT_ENCODING option, using zlib 1.2.0.3 or older, an attacker-controlled integer overflow would make libcurl perform a buffer overflow. There should be virtually no users left using such an old and vulnerable zlib version.
Welcome to another curl release. This time we do a bugfix only release, five weeks since the previous version shipped.
Release Presentation
Numbers
the 263rd release 0 changes 35 days (total: 9,763) 79 bugfixes (total: 11,173) 115 commits (total: 33,811) 0 new public libcurl function (total: 94) 0 new curl_easy_setopt() option (total: 306) 0 new curl command line option (total: 266) 51 contributors, 32 new (total: 3,299) 22 authors, 10 new (total: 1,323) 1 security fixes (total: 161)
Security
CVE-2024-11053: netrc and redirect credential leak. (Severity: Low) When asked to both use a .netrc file for credentials and to follow HTTP redirects, curl could leak the password used for the first host to the followed-to host under certain circumstances.
Bugfixes
As usual, here follows some bugfixes I figure could be worth highlighting. See the changelog on the curl site for the full list of changes.
curl
–continue-at is mutually exclusive with –no-clobber
–continue-at is mutually exclusive with –range
–continue-at is mutually exclusive with –remove-on-error
use real time in trace timestamps
scripts
dmaketgz: use –no-cache when building docker image
libcurl
duphandle: also init netrc
hostip: don’t use the resolver for FQDN localhost
mime: fix reader stall on small read lengths
mprintf: fix integer overflow checks
multi: fix callback for CURLMOPT_TIMERFUNCTION not being called again
netrc: address several netrc parser flaws
netrc: support large file, longer lines, longer tokens
socket: handle binding to “host!”
http related
http_negotiate: allow for a one byte larger channel binding buffer
digest: produce a shorter cnonce in Digest headers
cookie: treat cookie name case sensitively
nghttp2: use custom memory functions
protocols
libssh: use libssh sftp_aio to upload file
libssh: when using IPv6 numerical address, add brackets
OpenSSL: improved error message on expired certificate
rtsp: check EOS in the RTSP receive and return an error code
Welcome to this follow-up patch release, just a week after we shipped 8.10.0. A bunch of bugfixes.
Numbers
the 261th release 0 changes 7 days (total: 9,679) 24 bugfixes (total: 10,828) 50 commits (total: 33,259) 0 new public libcurl function (total: 94) 0 new curl_easy_setopt() option (total: 306) 0 new curl command line option (total: 265) 19 contributors, 7 new (total: 3,246) 9 authors, 1 new (total: 1,303) 0 security fixes (total: 158)
Download the new curl release from curl.se as always.
Release presentation
Bugfixes
These are the perhaps most important ones fixed this time:
fix configure –with-ca-embed. It could otherwise sometimes lead to an empty bundled CA store.
cmake: ensure CURL_USE_OPENSSL/USE_OPENSSL_QUIC are set in sync
cmake: fix MSH3 to appear on the feature list
runtests: accecpt ‘quictls’ as OpenSSL compatible. It would previously skip a few tests that are marked OpenSSL specific.
connect: store connection info when really done
fix FTP CRLF line endings for ASCII transfer regression. Perhaps most notably this problem was seen on directory listings, which are done using ASCII mode.
fix HTTP/2 end-of-stream handling when uploading data from stdin
http: make max-filesize check not count ignored bodies. Like in the case where a URL is redirected to a second place, the first URL might still provide a body that curl ignores.
fix AF_INET6 use outside of USE_IPV6. Made the build fail on systems without IPv6 support.
check that the multi handle is valid in curl_multi_assign. Perhaps not exactly libcurl’s responsibility, but we found at least one application that did this after the 8.10.0 upgrade.
on QUIC connects, keep on trying on draining server
request: correctly reset the eos_sent flag. When doing multiple HTTP/2 uploads using the same handle – this caused problems for git.
transfer: fix sendrecv() without interim poll. An optimization that optimized a little too much… Most commonly this problem was seen with PHP programs that often (but unwisely) skip the polling.
rustls: fixed minor logic bug in default cipher selection
rustls: support strong CSRNG data. Now every curl build using TLS ensures use of strong random numbers.
trurl is slowing growing up and maturing. This is a minor patch release following up the previous one done just a few weeks ago, fixing a few annoying bugs only.
The query parameter normalization introduced in 0.15 did not properly handle query pairs when one of the sides of the ‘=’ was blank.
Make the generated manpage “source” to use the version number, not the title – which should be plain trurl.
A minuscule escaping mistake in the manual markdown made the output render wrongly.
Only install the manpage for ‘make install’ if there really is a manpage present – since it is generated and bundled in the release tarball it is not necessary present when users build their own
Future
I have this feeling that we still have use cases and combinations that we don’t have tested in the test suite so we probably need to do a few more minor or patch releases until we are ready to bump this baby to 1.0.
the 260th release 18 changes 42 days (total: 9,672) 245 bugfixes (total: 10,804) 461 commits (total: 33,209) 0 new public libcurl function (total: 94) 0 new curl_easy_setopt() option (total: 306) 2 new curl command line option (total: 265) 57 contributors, 28 new (total: 3,239) 27 authors, 14 new (total: 1,302) 1 security fixes (total: 158)
Download the new curl release from curl.se as always.
Release presentation
Security
CVE-2024-8096: OCSP stapling bypass with GnuTLS When curl is told to use the Certificate Status Request TLS extension, often referred to as OCSP stapling, to verify that the server certificate is valid, it might fail to detect some OCSP problems and instead wrongly consider the response as fine.
support for setting TLS version and ciphers for Rustls
stop offering ALPN http/1.1 for http2-prior-knowledge
support for sslcert/sslkey blob options for wolfSSL
release tarball 100% reproducible. We also provide verify-release a convenient shell script allowing anyone and everyone to easily verify curl release tarballs.
Bugfixes
See the full changelog for the complete list. Here follows my favorite subset:
build: add poll() detection for cross-builds
cmake: 40+ bugfixes
configure: fail if PSL is not disabled but not found
runtests: remove “has_textaware”
curl: find curlrc in XDG_CONFIG_HOME without leading dot
curl: make the progress bar detect terminal width changes
curl: bump maximum post data size in memory to 16GB
bearssl/mbedtls/rustls/wolfssl: fix setting tls version
gnutls/wolfssl: improve error message when certificate fails
gnutls: send all data
openssl: certinfo errors now fail correctly
sectransp: fix setting tls version
x509asn1: raise size limit for x509 certification information
ftp: always offer line end conversions
ftp: fix pollset for listening
http2: improved upload eos handling
idn: support non-UTF-8 input under AppleIDN
ngtcp2: use NGHTTP3 prefix instead of NGTCP2 for errors in h3 callbacks
pop3: fix multi-line responses
managen: fix superfluous leading blank line in quoted sections. Nicer HTML version of the manpages.
managen: in man output, remove the leading space from examples
managen: wordwrap long example lines in ASCII output. Nicer curl --manual and -h output.
manpage: ensure a maximum width for the text version.
connect: always prefer ipv6 in IP eyeballing
aws_sigv4: fix canon order for headers with same prefix
cf-socket: prevent KEEPALIVE_FACTOR being set to 1000 for Windows
rand: only provide weak random when needed
sigpipe: init the struct so that first apply ignores
the 259th release 0 changes 7 days (total: 9,630) 28 bugfixes (total: 10,559) 43 commits (total: 32,748) 0 new public libcurl function (total: 94) 0 new curl_easy_setopt() option (total: 306) 0 new curl command line option (total: 263) 19 contributors, 5 new (total: 3,211) 10 authors, 1 new (total: 1,288) 1 security fixes (total: 158)
Download the new curl release from curl.se as always.
Release presentation
Security
We decided to do a patch release. Then yesterday we got a security vulnerability reported and so now we have that fixed in here as well.
CVE-2024-7264: ASN.1 date parser overread (severity low) libcurl’s ASN1 parser code has the GTime2str() function, used for parsing an ASN.1 Generalized Time field. If given an syntactically incorrect field, the parser might end up using -1 for the length of the time fraction, leading to a strlen() getting performed on a pointer to a heap buffer area that is not (purposely) null terminated.
Bugfixes
This release is done only because we shipped a few regressions in 8.9.0 we rather let users avoid. Here are some noteworthy fixes from the past week:
connection shutdown fix for event based processing – this would cause applications to keep monitoring sockets “too much”, easily leading to busy-loops or worse
cmake builds detect libssh and nettle better
several libcurl functions now survive NULL pointer inputs better
fixed an Apple SDK bug workaround for non-macOS targets
the curl tool builds with the manual enabled on OS400
works around an IBM (OS400) ASCII run-time library bug
speed limiting for 32bit systems had the wrong math
allow wolfSSL’s implementation of kyber to be used
wolfssl CA store caching fix
more defensive and portable socket code for the curl tool’s --ip-tos logic
the 258th release 11 changes 63 days (total: 9,623) 260 bugfixes (total: 10,531) 423 commits (total: 32,704) 0 new public libcurl function (total: 94) 1 new curl_easy_setopt() option (total: 306) 4 new curl command line option (total: 263) 80 contributors, 38 new (total: 3,209) 47 authors, 16 new (total: 1,288) 2 security fixes (total: 157)
Download the new curl release from curl.se as always.
Release presentation
Security
Today we fix two security vulnerabilities and publish all details about them.
CVE-2024-6197: freeing stack buffer in utf8asn1str. (severity medium) libcurl’s ASN1 parser has this utf8asn1str() function used for parsing an ASN.1 UTF-8 string. It can detect an invalid field and return error. Unfortunately, when doing so it also invokes free() on a 4 byte local stack buffer.
CVE-2024-6874: macidn punycode buffer overread. (severity low) libcurl’s URL API function curl_url_get() offers punycode conversions, to and from IDN. Asking to convert a name that is exactly 256 bytes, libcurl ends up reading outside of a stack based buffer when built to use the macidn IDN backend. The conversion function then fills up the provided buffer exactly – but does not null terminate the string.
Changes
–ip-tos (IP Type of Service / Traffic Class). Lets users set this IP header field to a number.
–mptcp. Asks curl to enable the Multipath TCP option for this connection, which if the server also allows it may make the TCP connection to go over multiple network paths.
–vlan-priority. Makes curl set the VLAN priority field for its IP traffic. This is typically a field used in the network layer below IP (think Ethernet), so it is not likely to survive through IP routers. A local network thing.
–keepalive-cnt (and CURLOPT_TCP_KEEPCNT). Specify how many keeplive probes curl should send before it considers the connection to be dead.
–write-out ‘%{num_retries}’ is a new variable for the info output that outputs the number of retries that were done for the previous transfer (when –retry was used).
gnutls now supports CA caching. For libcurl using applications, this can really speed up doing serial TLS connections.
mbedtls supports CURLOPT_CERTINFO. Returns certificate information to the application.
noproxy patterns need to be comma separated. Space separation is no longer enough.
In no other release ever before in curl’s long history have there been this many bugfixes: 260. Some of my favorites are:
cmake: 26 separate bugfixes
configure: 10 separate bugfixes
–help category cleanup and list categories in –help
allow etag and content-disposition for 3xx reply
docs: countless fixes, polish and corections
show name and keywords for failed tests in summary
avoid using GetAddrInfoExW with impersonation
URL encode the canonical path for aws-sigv4
fix DoH cleanup
fix memory leak and zero-length HTTPS RR crash in DoH
allow DoH transfers to override max connection limit
fix ß with AppleIDN
fix compilation with OpenSSL 1.x with md4 disabled
do a final progress update on connect failure
multi: fix pollset during RESOLVING phase
enable UDP GRO for QUIC
require at least OpenSSL 3.3 for QUIC
add shutdown support for HTTP/3 (QUIC)
fix CRLF conversion of input
fixed starttls for SMTP
change TCP keepalive from ms to seconds on DragonFly BSD
support TCP keepalive parameters on Solaris <11.4
shutdown TLS and TCP better
gnutls: pass in SNI name, not hostname when checking cert
gnutls: rectify the TLS version checks for QUIC
mbedtls v3.6.0 workarounds
several x509 asn.1 parser fixes
Next
Because the 8.9.0 release spent an extra week for its release cycle, the next one is going to be one week shorter. We do this by shortening the feature window to just two weeks this time, which might impact how many new features and changes we manage to merge.
We have a large amount of pull requests for changes already pending merge, waiting for the release window to open.
If all goes well, the next release is named 8.10.0 and eventually ships on September 11, 2024.
the 257th release 8 changes 56 days (total: 9,560) 220 bug-fixes (total: 10,271) 348 commits (total: 32,280) 1 new public libcurl function (total: 94) 1 new curl_easy_setopt() option (total: 305) 1 new curl command line option (total: 259) 84 contributors, 41 new (total: 3,173) 49 authors, 20 new (total: 1,272) 0 security fixes (total: 155)
Download the new curl release from curl.se as always.
Release presentation
Security
It feels good to be able to say that this time around we do not have a single security vulnerability to announce and we in fact do not have any in the queue either.
Some of the bugfixes from this cycle that might be worth noticing:
dist and build
reproducible tarballs. I will do a separate post with details later, but now it is easy for anyone who wants to, to generate an identical copy to verify what we ship.
docs/RELEASE-TOOLS.md into the tarball. This documents the tools and versions used to generate the files included in the tarball that are not present in git.
drop MSVC project files for recent versions. If you need to generate them for more recent versions, cmake can do it for you.
configure fix HAVE_IOCTLSOCKET_FIONBIO test for gcc 14. It runs more picky by default so it would always fail the check.
add -q as first option when invoking curl for tests. To reduce the risk of people having a ~/.curlrc file that ruins things.
fix make install with configure –disable-docs
tool
make –help adapt to the terminal width. Makes it easier on the eye when the terminal is wider.
limit rate unpause for -T . uploads. Avoids busy-looping
curl output warning for leading unicode quote character. Because it seems like a fairly common mistake when people copy and paste command lines from random sources
don’t truncate the etag save file by default. A regression less.
TLS
bearssl: use common code for cipher suite lookup
mbedtls: call mbedtls_ssl_setup() after RNG callback is set. Otherwise, more recent versions of mbedTLS will just return error.
mbedtls: support TLS 1.3. If you use a new enough version.
openssl: do not set SSL_MODE_RELEASE_BUFFERS. Uses slightly more memory, but uses fewer memory allocation calls.
wolfssl: plug memory leak in wolfssl_connect_step2()
bindings
openldap: create ldap URLs correctly for IPv6 addresses, doing LDAP with IPv6 numerical IP addresses in the URL just did not work previously.
quiche: expire all active transfers on connection close
quiche: trust its timeout handling
libcurl
fix curl_global_cleanup crash in Windows. A regression coming from the introduction of the async name resolver function.
brotli and others, pass through 0-length writes
ignore duplicate chunked encoding. Apparently some sites do this and browsers let them so we need to let it slide…
CURLINFO_REQUEST_SIZE: fixed
ftp: add tracing support. Gives us better tooling to track down FTP problems.
http2: emit RST when client write fails. Previously it would just silently leave the stream there…
http: reject HTTP major version switch mid connection. This should of course never happen, but if it does, curl will error out correctly.
multi: introduce SETUP state for better timeouts. This adds a proper separation for when the existing transfer is retried or when the state machine is restarted because it make as a new transfer.
multi: timeout handles even without connection. They would previously often be exempted from checks and would linger for too long until stopped.
fix handling of paused upload on completed download
do not URL decode proxy credentials
allow setting port number zero. Remember this old post?
