RELEASE-NOTES

curl and libcurl 8.18.0

 Public curl releases:         272
 Command line options:         273
 curl_easy_setopt() options:   308
 Public functions in libcurl:  100
 Contributors:                 3541

This release includes the following changes:

 o build: drop support for VS2008 (Windows) [62]
 o build: drop Windows CE / CeGCC support [69]
 o openssl: bump minimum OpenSSL version to 3.0.0 [60]

This release includes the following bugfixes:

 o _PROGRESS.md: add the E unit, mention kibibyte [24]
 o asyn-thrdd: release rrname if ares_init_options fails [41]
 o autotools: drop autoconf <2.59 compatibility code (zz60-xc-ovr) [70]
 o ccsidcurl: make curl_mime_data_ccsid() use the converted size [74]
 o cf-https-connect: allocate ctx at first in cf_hc_create() [79]
 o cf-socket: trace ignored errors [97]
 o checksrc.pl: detect assign followed by more than one space [26]
 o cmake: adjust defaults for target platforms not supporting shared libs [35]
 o cmake: disable `CURL_CA_PATH` auto-detection if `USE_APPLE_SECTRUST=ON` [16]
 o code: minor indent fixes before closing braces [107]
 o config2setopts: bail out if curl_url_get() returns OOM [102]
 o config2setopts: exit if curl_url_set() fails on OOM [105]
 o conncache: silence `-Wnull-dereference` on gcc 14 RISC-V 64 [17]
 o connect: reshuffle Curl_timeleft_ms to avoid 'redundant condition' [100]
 o cookie: propagate errors better, cleanup the internal API [118]
 o cshutdn: acknowledge FD_SETSIZE for shutdown descriptors [25]
 o curl: fix progress meter in parallel mode [15]
 o curl_setup.h: drop stray `#undef stat` (Windows) [103]
 o CURLINFO: remove 'get' and 'get the' from each short desc [50]
 o CURLINFO_SCHEME/PROTOCOL: they return the "scheme" for a "transfer" [48]
 o CURLINFO_TLS_SSL_PTR.md: remove CURLINFO_TLS_SESSION text [49]
 o CURLOPT_READFUNCTION.md: clarify the size of the buffer [47]
 o CURLOPT_SSH_KEYFUNCTION.md: fix minor indent mistake in example
 o digest_sspi: properly free sspi identity [12]
 o docs: fix checksrc `EQUALSPACE` warnings [21]
 o docs: mention umask need when curl creates files [56]
 o examples/crawler: fix variable [92]
 o examples/multithread: fix race condition [101]
 o ftp: refactor a piece of code by merging the repeated part [40]
 o ftp: remove #ifdef for define that is always defined [76]
 o getinfo: improve perf in debug mode [99]
 o gnutls: report accurate error when TLS-SRP is not built-in [18]
 o gtls: add return checks and optimize the code [2]
 o gtls: skip session resumption when verifystatus is set
 o hostip: don't store negative lookup on OOM [61]
 o http: replace atoi use in Curl_http_follow with curlx_str_number [65]
 o INSTALL-CMAKE.md: document static option defaults more [37]
 o krb5_sspi: unify a part of error handling [80]
 o lib: cleanup for some typos about spaces and code style [3]
 o lib: eliminate size_t casts [112]
 o lib: fix gssapi.h include on IBMi [55]
 o lib: refactor the type of funcs which have useless return and checks [1]
 o libtests: replace `atoi()` with `curlx_str_number()` [120]
 o libssh2: cleanup ssh_force_knownhost_key_type [64]
 o libssh2: replace atoi() in ssh_force_knownhost_key_type [63]
 o limit-rate: add example using --limit-rate and --max-time together [89]
 o m4/sectrust: fix test(1) operator [4]
 o mbedtls: fix potential use of uninitialized `nread` [8]
 o mk-ca-bundle.pl: default to SHA256 fingerprints with `-t` option [73]
 o mk-ca-bundle.pl: use `open()` with argument list to replace backticks [71]
 o mqtt: reject overly big messages [39]
 o noproxy: replace atoi with curlx_str_number [67]
 o openssl: release ssl_session if sess_reuse_cb fails [43]
 o openssl: remove code handling default version [28]
 o OS400/ccsidcurl: fix curl_easy_setopt_ccsid for non-converted blobs [94]
 o OS400/makefile.sh: fix shellcheck warning SC2038 [86]
 o osslq: code readability [5]
 o progress: show fewer digits [78]
 o pytest: skip H2 tests if feature missing from curl [46]
 o rtmp: fix double-free on URL parse errors [27]
 o rtmp: precaution for a potential integer truncation [54]
 o runtests: detect bad libssh differently for test 1459 [11]
 o runtests: drop Python 2 support remains [45]
 o rustls: fix a potential memory issue [81]
 o rustls: minor adjustment of sizeof() [38]
 o schannel: fix memory leak of cert_store_path on four error paths [23]
 o schannel: replace atoi() with curlx_str_number() [119]
 o scripts: fix shellcheck SC2046 warnings [90]
 o scripts: use end-of-options marker in `find -exec` commands [87]
 o setopt: disable CURLOPT_HAPROXY_CLIENT_IP on NULL [30]
 o setopt: when setting bad protocols, don't store them [9]
 o sftp: fix range downloads in both SSH backends [82]
 o socks_sspi: use free() not FreeContextBuffer() [93]
 o telnet: replace atoi for BINARY handling with curlx_str_number [66]
 o test07_22: fix flakiness [95]
 o test2045: replace HTML multi-line comment markup with `#` comments [36]
 o test363: delete stray character (typo) from a section tag [52]
 o tests/data: replace hard-coded test numbers with `%TESTNUMBER` [33]
 o tests/data: support using native newlines on disk, drop `.gitattributes` [91]
 o tests/server: do not fall back to original data file in `test2fopen()` [32]
 o tests/server: replace `atoi()` and `atol()` with `curlx_str_number()` [110]
 o tftp: release filename if conn_get_remote_addr fails [42]
 o tool: consider (some) curl_easy_setopt errors fatal [7]
 o tool_help: add checks to avoid unsigned wrap around [14]
 o tool_ipfs: check return codes better [20]
 o tool_operate: exit on curl_share_setopt errors [108]
 o tool_operate: remove redundant condition [19]
 o tool_operate: use curlx_str_number instead of atoi [68]
 o tool_paramhlp: refuse --proto remove all protocols [10]
 o urlapi: fix mem-leaks in curl_url_get error paths [22]
 o verify-release: update to avoid shellcheck warning SC2034 [88]
 o vquic-tls/gnutls: call Curl_gtls_verifyserver unconditionally [96]
 o vtls: fix CURLOPT_CAPATH use [51]
 o vtls: handle possible malicious certs_num from peer [53]
 o vtls: pinned key check [98]
 o wcurl: import v2025.11.09 [29]
 o wolfSSL: able to differentiate between IP and DNS in alt names [13]
 o wolfssl: avoid NULL dereference in OOM situation [77]
 o wolfssl: fix a potential memory leak of session [6]
 o wolfssl: simplify wssl_send_earlydata [111]

This release includes the following known bugs:

 See https://curl.se/docs/knownbugs.html

For all changes ever done in curl:

 See https://curl.se/changes.html

Planned upcoming removals include:

 o OpenSSL-QUIC
 o Support for c-ares versions before 1.16.0
 o Support for Windows XP/2003

 See https://curl.se/dev/deprecate.html

This release would not have looked like this without help, code, reports and
advice from friends like these:

  Aleksandr Sergeev, Andrew Kirillov, Brad King, Dan Fandrich, Daniel McCarney,
  Daniel Stenberg, Fd929c2CE5fA on github, Gisle Vanem, Jiyong Yang,
  Juliusz Sosinowicz, Leonardo Taccari, nait-furry, Nick Korepanov,
  Patrick Monnerat, pelioro on hackerone, Ray Satiro, renovate[bot],
  Samuel Henrique, Stanislav Fort, Stefan Eissing, Thomas Klausner,
  Viktor Szakats, Xiaoke Wang
  (23 contributors)

References to bug reports and discussions on issues:

 [1] = https://curl.se/bug/?i=19386
 [2] = https://curl.se/bug/?i=19366
 [3] = https://curl.se/bug/?i=19370
 [4] = https://curl.se/bug/?i=19371
 [5] = https://curl.se/bug/?i=19394
 [6] = https://curl.se/bug/?i=19555
 [7] = https://curl.se/bug/?i=19385
 [8] = https://curl.se/bug/?i=19393
 [9] = https://curl.se/bug/?i=19389
 [10] = https://curl.se/bug/?i=19388
 [11] = https://curl.se/bug/?i=19557
 [12] = https://curl.se/bug/?i=19426
 [13] = https://curl.se/bug/?i=19364
 [14] = https://curl.se/bug/?i=19377
 [15] = https://curl.se/bug/?i=19383
 [16] = https://curl.se/bug/?i=19380
 [17] = https://curl.se/bug/?i=19378
 [18] = https://curl.se/bug/?i=19365
 [19] = https://curl.se/bug/?i=19381
 [20] = https://curl.se/bug/?i=19382
 [21] = https://curl.se/bug/?i=19379
 [22] = https://curl.se/bug/?i=19440
 [23] = https://curl.se/bug/?i=19423
 [24] = https://curl.se/bug/?i=19502
 [25] = https://curl.se/bug/?i=19439
 [26] = https://curl.se/bug/?i=19375
 [27] = https://curl.se/bug/?i=19438
 [28] = https://curl.se/bug/?i=19354
 [29] = https://curl.se/bug/?i=19430
 [30] = https://curl.se/bug/?i=19434
 [32] = https://curl.se/bug/?i=19429
 [33] = https://curl.se/bug/?i=19427
 [35] = https://curl.se/bug/?i=19420
 [36] = https://curl.se/bug/?i=19498
 [37] = https://curl.se/bug/?i=19419
 [38] = https://hackerone.com/reports/3427460
 [39] = https://curl.se/bug/?i=19415
 [40] = https://curl.se/bug/?i=19411
 [41] = https://curl.se/bug/?i=19410
 [42] = https://curl.se/bug/?i=19409
 [43] = https://curl.se/bug/?i=19405
 [45] = https://curl.se/bug/?i=19544
 [46] = https://curl.se/bug/?i=19412
 [47] = https://curl.se/bug/?i=19402
 [48] = https://curl.se/bug/?i=19403
 [49] = https://curl.se/bug/?i=19404
 [50] = https://curl.se/bug/?i=19406
 [51] = https://curl.se/bug/?i=19401
 [52] = https://curl.se/bug/?i=19490
 [53] = https://curl.se/bug/?i=19397
 [54] = https://curl.se/bug/?i=19399
 [55] = https://curl.se/bug/?i=19336
 [56] = https://curl.se/bug/?i=19396
 [60] = https://curl.se/bug/?i=18330
 [61] = https://curl.se/bug/?i=19484
 [62] = https://curl.se/bug/?i=17931
 [63] = https://curl.se/bug/?i=19479
 [64] = https://curl.se/bug/?i=19479
 [65] = https://curl.se/bug/?i=19478
 [66] = https://curl.se/bug/?i=19477
 [67] = https://curl.se/bug/?i=19475
 [68] = https://curl.se/bug/?i=19480
 [69] = https://curl.se/bug/?i=17927
 [70] = https://curl.se/bug/?i=19464
 [71] = https://curl.se/bug/?i=19461
 [73] = https://curl.se/bug/?i=19359
 [74] = https://curl.se/bug/?i=19465
 [76] = https://curl.se/bug/?i=19463
 [77] = https://curl.se/bug/?i=19459
 [78] = https://curl.se/bug/?i=19431
 [79] = https://curl.se/bug/?i=19454
 [80] = https://curl.se/bug/?i=19452
 [81] = https://curl.se/bug/?i=19425
 [82] = https://curl.se/bug/?i=19460
 [86] = https://curl.se/bug/?i=19451
 [87] = https://curl.se/bug/?i=19450
 [88] = https://curl.se/bug/?i=19449
 [89] = https://curl.se/bug/?i=19473
 [90] = https://curl.se/bug/?i=19432
 [91] = https://curl.se/bug/?i=19398
 [92] = https://curl.se/bug/?i=19446
 [93] = https://curl.se/bug/?i=19445
 [94] = https://curl.se/bug/?i=19444
 [95] = https://curl.se/bug/?i=19530
 [96] = https://curl.se/bug/?i=19531
 [97] = https://curl.se/bug/?i=19520
 [98] = https://curl.se/bug/?i=19529
 [99] = https://curl.se/bug/?i=19525
 [100] = https://curl.se/bug/?i=19523
 [101] = https://curl.se/bug/?i=19524
 [102] = https://curl.se/bug/?i=19518
 [103] = https://curl.se/bug/?i=19519
 [105] = https://curl.se/bug/?i=19517
 [107] = https://curl.se/bug/?i=19512
 [108] = https://curl.se/bug/?i=19513
 [110] = https://curl.se/bug/?i=19510
 [111] = https://curl.se/bug/?i=19509
 [112] = https://curl.se/bug/?i=19495
 [118] = https://curl.se/bug/?i=19493
 [119] = https://curl.se/bug/?i=19483
 [120] = https://curl.se/bug/?i=19506