curl and libcurl 8.16.1

 Public curl releases:         271
 Command line options:         272
 curl_easy_setopt() options:   308
 Public functions in libcurl:  98
 Contributors:                 3502

This release includes the following changes:


This release includes the following bugfixes:

 o asyn-thrdd: drop pthread_cancel [30]
 o aws-lc: re-enable large read-ahead with v1.61.0 again [16]
 o cmake: fix building docs when the base directory contains `.3` [18]
 o cmdline-docs: extended, clarified, refreshed [28]
 o curl_easy_getinfo: error code on NULL arg [2]
 o curl_mem_undef.h: limit to `CURLDEBUG` for non-memalloc overrides [19]
 o CURLINFO_FTP_ENTRY_PATH.md: this is for SFTP as well [8]
 o CURLOPT_MAXLIFETIME_CONN: make default 24 hours [10]
 o CURLOPT_SSL_VERIFYHOST.md: add see-also to two other VERIFYHOST options [32]
 o CURLOPT_TIMECONDITION.md: works for FILE and FTP as well [27]
 o dist: do not distribute `CI.md` [29]
 o docs/libcurl: clarify some timeout option behavior [15]
 o docs/libcurl: remove ancient version references [7]
 o docs/libcurl: use lowercase must [5]
 o easy_getinfo: check magic, Curl_close safety [3]
 o krb5: return appropriate error on send failures [22]
 o libcurl-security.md: mention long-running connections [6]
 o Makefile.example: simplify and make it configurable [20]
 o ngtcp2: check error code on connect failure [13]
 o quic: fix min TLS version handling [14]
 o quic: ignore EMSGSIZE on receive [4]
 o setopt: accept *_SSL_VERIFYHOST set to 2L [31]
 o setopt: make CURLOPT_MAXREDIRS accept -1 (again) [1]
 o ssl-sessions.md: mark option experimental [12]
 o sws: fix checking `sscanf()` return value [17]
 o TODO: remove already implemented or bad items [36]
 o urldata: FILE is not a list-only protocol [9]

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 Builds using VS2008
 o OpenSSL 1.x support
 o Support for c-ares versions before 1.16.0
 o Support for Windows XP/2003
 o The winbuild build system
 o Windows CE support

 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:

  Adam Light, Andrew Kirillov, Dan Fandrich, Daniel Stenberg, dependabot[bot],
  Emilio Pozuelo Monfort, Ethan Everett, fds242 on github, Javier Blazquez,
  Jicea, Nir Azkiel, renovate[bot], Samuel Dionne-Riel, Stefan Eissing,
  Viktor Szakats
  (15 contributors)

References to bug reports and discussions on issues:

 [1] = https://curl.se/bug/?i=18571
 [2] = https://curl.se/bug/?i=18512
 [3] = https://curl.se/bug/?i=18511
 [4] = https://curl.se/bug/?i=18505
 [5] = https://curl.se/bug/?i=18570
 [6] = https://curl.se/bug/?i=18533
 [7] = https://curl.se/bug/?i=18530
 [8] = https://curl.se/bug/?i=18531
 [9] = https://curl.se/bug/?i=18525
 [10] = https://curl.se/bug/?i=18527
 [12] = https://curl.se/bug/?i=18523
 [13] = https://curl.se/bug/?i=18521
 [14] = https://curl.se/bug/?i=18518
 [15] = https://curl.se/bug/?i=18569
 [16] = https://curl.se/bug/?i=18568
 [17] = https://curl.se/bug/?i=18565
 [18] = https://curl.se/bug/?i=18560
 [19] = https://curl.se/bug/?i=18510
 [20] = https://curl.se/bug/?i=18554
 [22] = https://curl.se/bug/?i=18561
 [27] = https://curl.se/bug/?i=18551
 [28] = https://curl.se/bug/?i=18550
 [29] = https://curl.se/bug/?i=18549
 [30] = https://curl.se/bug/?i=18532
 [31] = https://curl.se/mail/lib-2025-09/0031.html
 [32] = https://curl.se/bug/?i=18548
 [36] = https://curl.se/bug/?i=18542